/* * Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2012, 2025 SAP SE. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "classfile/vmSymbols.hpp" #include "code/vtableStubs.hpp" #include "compiler/compileBroker.hpp" #include "interpreter/interpreter.hpp" #include "jvm.h" #include "jvmtifiles/jvmti.h" #include "libperfstat_aix.hpp" #include "libodm_aix.hpp" #include "loadlib_aix.hpp" #include "logging/log.hpp" #include "logging/logStream.hpp" #include "memory/allocation.inline.hpp" #include "misc_aix.hpp" #include "oops/oop.inline.hpp" #include "os_aix.inline.hpp" #include "os_posix.hpp" #include "porting_aix.hpp" #include "prims/jniFastGetField.hpp" #include "prims/jvm_misc.hpp" #include "runtime/arguments.hpp" #include "runtime/atomic.hpp" #include "runtime/globals.hpp" #include "runtime/globals_extension.hpp" #include "runtime/interfaceSupport.inline.hpp" #include "runtime/java.hpp" #include "runtime/javaCalls.hpp" #include "runtime/javaThread.hpp" #include "runtime/mutexLocker.hpp" #include "runtime/objectMonitor.hpp" #include "runtime/os.hpp" #include "runtime/osInfo.hpp" #include "runtime/osThread.hpp" #include "runtime/perfMemory.hpp" #include "runtime/safefetch.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/threads.hpp" #include "runtime/timer.hpp" #include "runtime/vm_version.hpp" #include "services/attachListener.hpp" #include "services/runtimeService.hpp" #include "signals_posix.hpp" #include "utilities/align.hpp" #include "utilities/checkedCast.hpp" #include "utilities/debug.hpp" #include "utilities/decoder.hpp" #include "utilities/defaultStream.hpp" #include "utilities/events.hpp" #include "utilities/growableArray.hpp" #include "utilities/permitForbiddenFunctions.hpp" #include "utilities/vmError.hpp" #if INCLUDE_JFR #include "jfr/support/jfrNativeLibraryLoadEvent.hpp" #endif // put OS-includes here (sorted alphabetically) #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include // sys/mman.h defines MAP_ANON_64K beginning with AIX7.3 TL1 #ifndef MAP_ANON_64K #define MAP_ANON_64K 0x400 #else STATIC_ASSERT(MAP_ANON_64K == 0x400); #endif #include #include #include #include #include #include #include #include #include #include #include #include #ifndef _LARGE_FILES #error Hotspot on AIX must be compiled with -D_LARGE_FILES #endif // Missing prototypes for various system APIs. extern "C" int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t); #if !defined(_AIXVERSION_610) extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int); extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int); extern "C" int getargs(procsinfo*, int, char*, int); #endif #define MAX_PATH (2 * K) // for multipage initialization error analysis (in 'g_multipage_error') #define ERROR_MP_OS_TOO_OLD 100 #define ERROR_MP_EXTSHM_ACTIVE 101 #define ERROR_MP_VMGETINFO_FAILED 102 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103 // excerpts from sys/systemcfg.h that might be missing on older os levels #ifndef PV_8 #define PV_8 0x300000 /* Power PC 8 */ #endif #ifndef PV_8_Compat #define PV_8_Compat 0x308000 /* Power PC 8 */ #endif #ifndef PV_9 #define PV_9 0x400000 /* Power PC 9 */ #endif #ifndef PV_9_Compat #define PV_9_Compat 0x408000 /* Power PC 9 */ #endif #ifndef PV_10 #define PV_10 0x500000 /* Power PC 10 */ #endif #ifndef PV_10_Compat #define PV_10_Compat 0x508000 /* Power PC 10 */ #endif #ifndef PV_11 #define PV_11 0x600000 /* Power PC 11 */ #endif #ifndef PV_11_Compat #define PV_11_Compat 0x608000 /* Power PC 11 */ #endif static address resolve_function_descriptor_to_code_pointer(address p); static void vmembk_print_on(outputStream* os); //////////////////////////////////////////////////////////////////////////////// // global variables (for a description see os_aix.hpp) julong os::Aix::_physical_memory = 0; pthread_t os::Aix::_main_thread = ((pthread_t)0); // 0 = uninitialized, otherwise 32 bit number: // 0xVVRRTTSS // VV - major version // RR - minor version // TT - tech level, if known, 0 otherwise // SS - service pack, if known, 0 otherwise uint32_t os::Aix::_os_version = 0; // -1 = uninitialized, 0 - no, 1 - yes int os::Aix::_xpg_sus_mode = -1; // -1 = uninitialized, 0 - no, 1 - yes int os::Aix::_extshm = -1; //////////////////////////////////////////////////////////////////////////////// // local variables static volatile jlong max_real_time = 0; // Process break recorded at startup. static address g_brk_at_startup = nullptr; // This describes the state of multipage support of the underlying // OS. Note that this is of no interest to the outsize world and // therefore should not be defined in AIX class. // // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The // latter two (16M "large" resp. 16G "huge" pages) require special // setup and are normally not available. // // AIX supports multiple page sizes per process, for: // - Stack (of the primordial thread, so not relevant for us) // - Data - data, bss, heap, for us also pthread stacks // - Text - text code // - shared memory // // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...) // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...). // // For shared memory, page size can be set dynamically via // shmctl(). Different shared memory regions can have different page // sizes. // // More information can be found at AIBM info center: // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm // static struct { size_t pagesize; // sysconf _SC_PAGESIZE (4K) size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE) size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE) size_t pthr_stack_pagesize; // stack page size of pthread threads size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE) bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm. bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm. bool can_use_64K_mmap_pages; // True if we can alloc 64K pages dynamically with mmap. int error; // Error describing if something went wrong at multipage init. } g_multipage_support = { (size_t) -1, (size_t) -1, (size_t) -1, (size_t) -1, (size_t) -1, false, false, false, 0 }; // We must not accidentally allocate memory close to the BRK - even if // that would work - because then we prevent the BRK segment from // growing which may result in a malloc OOM even though there is // enough memory. The problem only arises if we shmat() or mmap() at // a specific wish address, e.g. to place the heap in a // compressed-oops-friendly way. static bool is_close_to_brk(address a) { assert0(g_brk_at_startup != nullptr); if (a >= g_brk_at_startup && a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) { return true; } return false; } julong os::free_memory() { return Aix::available_memory(); } julong os::available_memory() { return Aix::available_memory(); } julong os::Aix::available_memory() { os::Aix::meminfo_t mi; if (os::Aix::get_meminfo(&mi)) { return mi.real_free; } else { return ULONG_MAX; } } jlong os::total_swap_space() { perfstat_memory_total_t memory_info; if (libperfstat::perfstat_memory_total(nullptr, &memory_info, sizeof(perfstat_memory_total_t), 1) == -1) { return -1; } return (jlong)(memory_info.pgsp_total * 4 * K); } jlong os::free_swap_space() { perfstat_memory_total_t memory_info; if (libperfstat::perfstat_memory_total(nullptr, &memory_info, sizeof(perfstat_memory_total_t), 1) == -1) { return -1; } return (jlong)(memory_info.pgsp_free * 4 * K); } julong os::physical_memory() { return Aix::physical_memory(); } size_t os::rss() { return (size_t)0; } // Cpu architecture string #if defined(PPC32) static char cpu_arch[] = "ppc"; #elif defined(PPC64) static char cpu_arch[] = "ppc64"; #else #error Add appropriate cpu_arch setting #endif // Given an address, returns the size of the page backing that address. size_t os::Aix::query_pagesize(void* addr) { vm_page_info pi; pi.addr = (uint64_t)addr; if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) { return pi.pagesize; } else { log_warning(pagesize)("vmgetinfo(VM_PAGE_INFO) failed (errno: %d)", errno); assert(false, "vmgetinfo failed to retrieve page size"); return 4*K; } } void os::Aix::initialize_system_info() { // Get the number of online(logical) cpus instead of configured. os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN); assert(_processor_count > 0, "_processor_count must be > 0"); // Retrieve total physical storage. os::Aix::meminfo_t mi; if (!os::Aix::get_meminfo(&mi)) { assert(false, "os::Aix::get_meminfo failed."); } _physical_memory = (julong) mi.real_total; } // Helper function for tracing page sizes. static const char* describe_pagesize(size_t pagesize) { switch (pagesize) { case 4*K : return "4K"; case 64*K: return "64K"; case 16*M: return "16M"; case 16*G: return "16G"; default: assert(false, "surprise"); return "??"; } } // Probe OS for multipage support. // Will fill the global g_multipage_support structure. // Must be called before calling os::large_page_init(). static void query_multipage_support() { guarantee(g_multipage_support.pagesize == (size_t)-1, "do not call twice"); g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE); // This really would surprise me. assert(g_multipage_support.pagesize == 4*K, "surprise!"); // Query default data page size (default page size for C-Heap, pthread stacks and .bss). // Default data page size is defined either by linker options (-bdatapsize) // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given, // default should be 4K. { void* p = permit_forbidden_function::malloc(16*M); g_multipage_support.datapsize = os::Aix::query_pagesize(p); permit_forbidden_function::free(p); } // Query default shm page size (LDR_CNTRL SHMPSIZE). // Note that this is pure curiosity. We do not rely on default page size but set // our own page size after allocated. { const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR); assert(shmid != -1, "shmget failed"); if (shmid != -1) { void* p = ::shmat(shmid, nullptr, 0); ::shmctl(shmid, IPC_RMID, nullptr); assert(p != (void*) -1, "shmat failed"); if (p != (void*) -1) { g_multipage_support.shmpsize = os::Aix::query_pagesize(p); ::shmdt(p); } } } // Before querying the stack page size, make sure we are not running as primordial // thread (because primordial thread's stack may have different page size than // pthread thread stacks). Running a VM on the primordial thread won't work for a // number of reasons so we may just as well guarantee it here. guarantee0(!os::is_primordial_thread()); // Query pthread stack page size. Should be the same as data page size because // pthread stacks are allocated from C-Heap. { int dummy = 0; g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy); } // Query default text page size (LDR_CNTRL TEXTPSIZE). { address any_function = resolve_function_descriptor_to_code_pointer((address)describe_pagesize); g_multipage_support.textpsize = os::Aix::query_pagesize(any_function); } // Now check which page sizes the OS claims it supports, and of those, which actually can be used. { const int MAX_PAGE_SIZES = 4; psize_t sizes[MAX_PAGE_SIZES]; const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES); if (num_psizes == -1) { log_warning(pagesize)("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d), disabling multipage support.", errno); g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED; goto query_multipage_support_end; } guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed."); assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?"); log_info(pagesize)("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes); for (int i = 0; i < num_psizes; i ++) { trcVerbose(" %s ", describe_pagesize(sizes[i])); } // Can we use 64K, 16M pages? for (int i = 0; i < num_psizes; i ++) { const size_t pagesize = sizes[i]; if (pagesize != 64*K && pagesize != 16*M) { continue; } bool can_use = false; trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize)); const int shmid = ::shmget(IPC_PRIVATE, pagesize, IPC_CREAT | S_IRUSR | S_IWUSR); assert(shmid != -1, "shmget failed"); if (shmid != -1) { // Try to set pagesize. struct shmid_ds shm_buf = { }; shm_buf.shm_pagesize = pagesize; if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) { const int en = errno; ::shmctl(shmid, IPC_RMID, nullptr); // As early as possible! log_warning(pagesize)("shmctl(SHM_PAGESIZE) failed with errno=%d", errno); } else { // Attach and double check pageisze. void* p = ::shmat(shmid, nullptr, 0); ::shmctl(shmid, IPC_RMID, nullptr); // As early as possible! assert(p != (void*) -1, "shmat failed"); if (p != (void*) -1) { const size_t real_pagesize = os::Aix::query_pagesize(p); if (real_pagesize != pagesize) { log_warning(pagesize)("real page size (0x%zx) differs.", real_pagesize); } else { can_use = true; } ::shmdt(p); } } } trcVerbose("Can use: %s", (can_use ? "yes" : "no")); if (pagesize == 64*K) { g_multipage_support.can_use_64K_pages = can_use; } else if (pagesize == 16*M) { g_multipage_support.can_use_16M_pages = can_use; } } // Can we use mmap with 64K pages? (Should be available with AIX7.3 TL1) { void* p = mmap(nullptr, 64*K, PROT_READ | PROT_WRITE, MAP_ANON_64K | MAP_ANONYMOUS | MAP_SHARED, -1, 0); assert(p != (void*) -1, "mmap failed"); if (p != (void*) -1) { g_multipage_support.can_use_64K_mmap_pages = (64*K == os::Aix::query_pagesize(p)); munmap(p, 64*K); } } } // end: check which pages can be used for shared memory query_multipage_support_end: trcVerbose("base page size (sysconf _SC_PAGESIZE): %s", describe_pagesize(g_multipage_support.pagesize)); trcVerbose("Data page size (C-Heap, bss, etc): %s", describe_pagesize(g_multipage_support.datapsize)); trcVerbose("Text page size: %s", describe_pagesize(g_multipage_support.textpsize)); trcVerbose("Thread stack page size (pthread): %s", describe_pagesize(g_multipage_support.pthr_stack_pagesize)); trcVerbose("Can use 64K pages with mmap memory: %s", (g_multipage_support.can_use_64K_mmap_pages ? "yes" :"no")); trcVerbose("Default shared memory page size: %s", describe_pagesize(g_multipage_support.shmpsize)); trcVerbose("Can use 64K pages dynamically with shared memory: %s", (g_multipage_support.can_use_64K_pages ? "yes" :"no")); trcVerbose("Can use 16M pages dynamically with shared memory: %s", (g_multipage_support.can_use_16M_pages ? "yes" :"no")); trcVerbose("Multipage error details: %d", g_multipage_support.error); // sanity checks assert0(g_multipage_support.pagesize == 4*K); assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K); assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K); assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize); assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K); } void os::init_system_properties_values() { #ifndef OVERRIDE_LIBPATH #define DEFAULT_LIBPATH "/lib:/usr/lib" #else #define DEFAULT_LIBPATH OVERRIDE_LIBPATH #endif #define EXTENSIONS_DIR "/lib/ext" // Buffer that fits several snprintfs. // Note that the space for the trailing null is provided // by the nulls included by the sizeof operator. const size_t bufsize = MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); // sysclasspath, java_home, dll_dir { char *pslash; os::jvm_path(buf, bufsize); // Found the full path to libjvm.so. // Now cut the path to /jre if we can. pslash = strrchr(buf, '/'); if (pslash != nullptr) { *pslash = '\0'; // Get rid of /libjvm.so. } pslash = strrchr(buf, '/'); if (pslash != nullptr) { *pslash = '\0'; // Get rid of /{client|server|hotspot}. } Arguments::set_dll_dir(buf); if (pslash != nullptr) { pslash = strrchr(buf, '/'); if (pslash != nullptr) { *pslash = '\0'; // Get rid of /lib. } } Arguments::set_java_home(buf); if (!set_boot_path('/', ':')) { vm_exit_during_initialization("Failed setting boot class path.", nullptr); } } // Where to look for native libraries. // On Aix we get the user setting of LIBPATH. // Eventually, all the library path setting will be done here. // Get the user setting of LIBPATH. const char *v = ::getenv("LIBPATH"); const char *v_colon = ":"; if (v == nullptr) { v = ""; v_colon = ""; } // Concatenate user and invariant part of ld_library_path. // That's +1 for the colon and +1 for the trailing '\0'. size_t pathsize = strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1; char *ld_library_path = NEW_C_HEAP_ARRAY(char, pathsize, mtInternal); os::snprintf_checked(ld_library_path, pathsize, "%s%s" DEFAULT_LIBPATH, v, v_colon); Arguments::set_library_path(ld_library_path); FREE_C_HEAP_ARRAY(char, ld_library_path); // Extensions directories. os::snprintf_checked(buf, bufsize, "%s" EXTENSIONS_DIR, Arguments::get_java_home()); Arguments::set_ext_dirs(buf); FREE_C_HEAP_ARRAY(char, buf); #undef DEFAULT_LIBPATH #undef EXTENSIONS_DIR } // retrieve memory information. // Returns false if something went wrong; // content of pmi undefined in this case. bool os::Aix::get_meminfo(meminfo_t* pmi) { assert(pmi, "get_meminfo: invalid parameter"); memset(pmi, 0, sizeof(meminfo_t)); // dynamically loaded perfstat library is used to retrieve memory statistics perfstat_memory_total_t psmt; memset (&psmt, '\0', sizeof(psmt)); const int rc = libperfstat::perfstat_memory_total(nullptr, &psmt, sizeof(psmt), 1); if (rc == -1) { log_warning(os)("perfstat_memory_total() failed (errno=%d)", errno); assert(0, "perfstat_memory_total() failed"); return false; } assert(rc == 1, "perfstat_memory_total() - weird return code"); // The fields of perfstat_memory_total_t: // u_longlong_t virt_total Total virtual memory (in 4 KB pages). // u_longlong_t real_total Total real memory (in 4 KB pages). // u_longlong_t real_free Free real memory (in 4 KB pages). // u_longlong_t pgsp_total Total paging space (in 4 KB pages). // u_longlong_t pgsp_free Free paging space (in 4 KB pages). pmi->virt_total = psmt.virt_total * 4096; pmi->real_total = psmt.real_total * 4096; pmi->real_free = psmt.real_free * 4096; pmi->pgsp_total = psmt.pgsp_total * 4096; pmi->pgsp_free = psmt.pgsp_free * 4096; return true; } // end os::Aix::get_meminfo ////////////////////////////////////////////////////////////////////////////// // create new thread // Thread start routine for all newly created threads static void *thread_native_entry(Thread *thread) { thread->record_stack_base_and_size(); const pthread_t pthread_id = ::pthread_self(); const tid_t kernel_thread_id = ::thread_self(); LogTarget(Info, os, thread) lt; if (lt.is_enabled()) { address low_address = thread->stack_end(); address high_address = thread->stack_base(); lt.print("Thread is alive (tid: %zu, kernel thread id: %zu" ", stack [" PTR_FORMAT " - " PTR_FORMAT " (%zuk using %luk pages)).", os::current_thread_id(), (uintx) kernel_thread_id, p2i(low_address), p2i(high_address), (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K); } // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc() // by the pthread library). In rare cases, this may not be the case, e.g. when third-party // tools hook pthread_create(). In this case, we may run into problems establishing // guard pages on those stacks, because the stacks may reside in memory which is not // protectable (shmated). if (thread->stack_base() > ::sbrk(0)) { log_warning(os, thread)("Thread stack not in data segment."); } // Try to randomize the cache line index of hot stack frames. // This helps when threads of the same stack traces evict each other's // cache lines. The threads can be either from the same JVM instance, or // from different JVM instances. The benefit is especially true for // processors with hyperthreading technology. static int counter = 0; int pid = os::current_process_id(); alloca(((pid ^ counter++) & 7) * 128); thread->initialize_thread_current(); OSThread* osthread = thread->osthread(); // Thread_id is pthread id. osthread->set_thread_id(pthread_id); // .. but keep kernel thread id too for diagnostics osthread->set_kernel_thread_id(kernel_thread_id); // Initialize signal mask for this thread. PosixSignals::hotspot_sigmask(thread); // Initialize floating point control register. os::Aix::init_thread_fpu_state(); assert(osthread->get_state() == RUNNABLE, "invalid os thread state"); // Call one more level start routine. thread->call_run(); // Note: at this point the thread object may already have deleted itself. // Prevent dereferencing it from here on out. thread = nullptr; log_info(os, thread)("Thread finished (tid: %zu, kernel thread id: %zu).", os::current_thread_id(), (uintx) kernel_thread_id); return 0; } bool os::create_thread(Thread* thread, ThreadType thr_type, size_t req_stack_size) { assert(thread->osthread() == nullptr, "caller responsible"); // Allocate the OSThread object. OSThread* osthread = new (std::nothrow) OSThread(); if (osthread == nullptr) { return false; } // Initial state is ALLOCATED but not INITIALIZED osthread->set_state(ALLOCATED); thread->set_osthread(osthread); // Init thread attributes. pthread_attr_t attr; int rslt = pthread_attr_init(&attr); if (rslt != 0) { thread->set_osthread(nullptr); delete osthread; return false; } pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); // Make sure we run in 1:1 kernel-user-thread mode. guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???"); guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???"); // Start in suspended state, and in os::thread_start, wake the thread up. guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???"); // Calculate stack size if it's not specified by caller. size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); // JDK-8187028: It was observed that on some configurations (4K backed thread stacks) // the real thread stack size may be smaller than the requested stack size, by as much as 64K. // This very much looks like a pthread lib error. As a workaround, increase the stack size // by 64K for small thread stacks (arbitrarily chosen to be < 4MB) if (stack_size < 4096 * K) { stack_size += 64 * K; } // On Aix, pthread_attr_setstacksize fails with huge values and leaves the // thread size in attr unchanged. If this is the minimal stack size as set // by pthread_attr_init this leads to crashes after thread creation. E.g. the // guard pages might not fit on the tiny stack created. int ret = pthread_attr_setstacksize(&attr, stack_size); if (ret != 0) { log_warning(os, thread)("The %sthread stack size specified is invalid: %zuk", (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "), stack_size / K); thread->set_osthread(nullptr); delete osthread; pthread_attr_destroy(&attr); return false; } // Save some cycles and a page by disabling OS guard pages where we have our own // VM guard pages (in java threads). For other threads, keep system default guard // pages in place. if (thr_type == java_thread || thr_type == compiler_thread) { ret = pthread_attr_setguardsize(&attr, 0); } ResourceMark rm; pthread_t tid = 0; if (ret == 0) { int trials_remaining = 4; useconds_t next_delay = 1000; while (true) { ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); if (ret != EAGAIN) { break; } if (--trials_remaining <= 0) { break; } log_debug(os, thread)("Failed to start native thread (%s), retrying after %dus.", os::errno_name(ret), next_delay); ::usleep(next_delay); next_delay *= 2; } } if (ret == 0) { char buf[64]; log_info(os, thread)("Thread \"%s\" started (pthread id: %zu, attributes: %s). ", thread->name(), (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); } else { char buf[64]; log_warning(os, thread)("Failed to start thread \"%s\" - pthread_create failed (%d=%s) for attributes: %s.", thread->name(), ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); // Log some OS information which might explain why creating the thread failed. log_warning(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); log_warning(os, thread)("Checking JVM parameter MaxExpectedDataSegmentSize (currently %zuk) might be helpful", MaxExpectedDataSegmentSize/K); LogStream st(Log(os, thread)::info()); os::Posix::print_rlimit_info(&st); os::print_memory_info(&st); } pthread_attr_destroy(&attr); if (ret != 0) { // Need to clean up stuff we've allocated so far. thread->set_osthread(nullptr); delete osthread; return false; } // OSThread::thread_id is the pthread id. osthread->set_thread_id(tid); // child thread synchronization is not done here on AIX, a thread is started in suspended state return true; } ///////////////////////////////////////////////////////////////////////////// // attach existing thread // bootstrap the main thread bool os::create_main_thread(JavaThread* thread) { assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread"); return create_attached_thread(thread); } bool os::create_attached_thread(JavaThread* thread) { #ifdef ASSERT thread->verify_not_published(); #endif // Allocate the OSThread object OSThread* osthread = new (std::nothrow) OSThread(); if (osthread == nullptr) { return false; } const pthread_t pthread_id = ::pthread_self(); const tid_t kernel_thread_id = ::thread_self(); // OSThread::thread_id is the pthread id. osthread->set_thread_id(pthread_id); // .. but keep kernel thread id too for diagnostics osthread->set_kernel_thread_id(kernel_thread_id); // initialize floating point control register os::Aix::init_thread_fpu_state(); // Initial thread state is RUNNABLE osthread->set_state(RUNNABLE); thread->set_osthread(osthread); // initialize signal mask for this thread // and save the caller's signal mask PosixSignals::hotspot_sigmask(thread); log_info(os, thread)("Thread attached (tid: %zu, kernel thread id: %zu" ", stack: " PTR_FORMAT " - " PTR_FORMAT " (%zuK) ).", os::current_thread_id(), (uintx) kernel_thread_id, p2i(thread->stack_base()), p2i(thread->stack_end()), thread->stack_size() / K); return true; } void os::pd_start_thread(Thread* thread) { int status = pthread_continue_np(thread->osthread()->pthread_id()); assert(status == 0, "thr_continue failed"); } // Free OS resources related to the OSThread void os::free_thread(OSThread* osthread) { assert(osthread != nullptr, "osthread not set"); // We are told to free resources of the argument thread, but we can only really operate // on the current thread. The current thread may be already detached at this point. assert(Thread::current_or_null() == nullptr || Thread::current()->osthread() == osthread, "os::free_thread but not current thread"); // Restore caller's signal mask sigset_t sigmask = osthread->caller_sigmask(); pthread_sigmask(SIG_SETMASK, &sigmask, nullptr); delete osthread; } //////////////////////////////////////////////////////////////////////////////// // time support double os::elapsedVTime() { struct rusage usage; int retval = getrusage(RUSAGE_THREAD, &usage); if (retval == 0) { return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000); } else { // better than nothing, but not much return elapsedTime(); } } // We use mread_real_time here. // On AIX: If the CPU has a time register, the result will be RTC_POWER and // it has to be converted to real time. AIX documentations suggests to do // this unconditionally, so we do it. // // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm // jlong os::javaTimeNanos() { timebasestruct_t time; int rc = mread_real_time(&time, TIMEBASE_SZ); if (rc != RTC_POWER) { rc = time_base_to_time(&time, TIMEBASE_SZ); assert(rc != -1, "error calling time_base_to_time()"); } return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); } void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { info_ptr->max_value = all_bits_jlong; // mread_real_time() is monotonic (see 'os::javaTimeNanos()') info_ptr->may_skip_backward = false; info_ptr->may_skip_forward = false; info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time } intx os::current_thread_id() { return (intx)pthread_self(); } int os::current_process_id() { return getpid(); } // DLL functions // This must be hard coded because it's the system's temporary // directory not the java application's temp directory, ala java.io.tmpdir. const char* os::get_temp_directory() { return "/tmp"; } void os::prepare_native_symbols() { LoadedLibraries::reload(); } // Check if addr is inside libjvm.so. bool os::address_is_in_vm(address addr) { // Input could be a real pc or a function pointer literal. The latter // would be a function descriptor residing in the data segment of a module. loaded_module_t lm; if (LoadedLibraries::find_for_text_address(addr, &lm)) { return lm.is_in_vm; } else if (LoadedLibraries::find_for_data_address(addr, &lm)) { return lm.is_in_vm; } else { return false; } } // Resolve an AIX function descriptor literal to a code pointer. // If the input is a valid code pointer to a text segment of a loaded module, // it is returned unchanged. // If the input is a valid AIX function descriptor, it is resolved to the // code entry point. // If the input is neither a valid function descriptor nor a valid code pointer, // null is returned. static address resolve_function_descriptor_to_code_pointer(address p) { if (LoadedLibraries::find_for_text_address(p, nullptr)) { // It is a real code pointer. return p; } else if (LoadedLibraries::find_for_data_address(p, nullptr)) { // Pointer to data segment, potential function descriptor. address code_entry = (address)(((FunctionDescriptor*)p)->entry()); if (LoadedLibraries::find_for_text_address(code_entry, nullptr)) { // It is a function descriptor. return code_entry; } } return nullptr; } bool os::dll_address_to_function_name(address addr, char *buf, int buflen, int *offset, bool demangle) { if (offset) { *offset = -1; } // Buf is not optional, but offset is optional. assert(buf != nullptr, "sanity check"); buf[0] = '\0'; // Resolve function ptr literals first. addr = resolve_function_descriptor_to_code_pointer(addr); if (!addr) { return false; } return AixSymbols::get_function_name(addr, buf, buflen, offset, nullptr, demangle); } bool os::dll_address_to_library_name(address addr, char* buf, int buflen, int* offset) { if (offset) { *offset = -1; } // Buf is not optional, but offset is optional. assert(buf != nullptr, "sanity check"); buf[0] = '\0'; // Resolve function ptr literals first. addr = resolve_function_descriptor_to_code_pointer(addr); if (!addr) { return false; } address base = nullptr; if (!AixSymbols::get_module_name_and_base(addr, buf, buflen, &base) || base == nullptr) { return false; } assert(addr >= base && addr <= base + INT_MAX, "address not in library text range"); if (offset != nullptr) { *offset = addr - base; } return true; } static void* dll_load_library(const char *filename, int *eno, char *ebuf, int ebuflen) { log_info(os)("attempting shared library load of %s", filename); if (ebuf && ebuflen > 0) { ebuf[0] = '\0'; ebuf[ebuflen - 1] = '\0'; } if (!filename || strlen(filename) == 0) { if (ebuf != nullptr && ebuflen > 0) { ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1); } return nullptr; } // RTLD_LAZY has currently the same behavior as RTLD_NOW // The dl is loaded immediately with all its dependants. int dflags = RTLD_LAZY; // check for filename ending with ')', it indicates we want to load // a MEMBER module that is a member of an archive. int flen = strlen(filename); if (flen > 0 && filename[flen - 1] == ')') { dflags |= RTLD_MEMBER; } void* result; const char* error_report = nullptr; JFR_ONLY(NativeLibraryLoadEvent load_event(filename, &result);) result = Aix_dlopen(filename, dflags, eno, &error_report); if (result != nullptr) { Events::log_dll_message(nullptr, "Loaded shared library %s", filename); // Reload dll cache. Don't do this in signal handling. LoadedLibraries::reload(); log_info(os)("shared library load of %s was successful", filename); return result; } else { // error analysis when dlopen fails if (error_report == nullptr) { error_report = "dlerror returned no error description"; } if (ebuf != nullptr && ebuflen > 0) { snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s", filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report); } Events::log_dll_message(nullptr, "Loading shared library %s failed, %s", filename, error_report); log_info(os)("shared library load of %s failed, %s", filename, error_report); JFR_ONLY(load_event.set_error_msg(error_report);) } return nullptr; } // Load library named // If filename matches .so, and loading fails, repeat with .a. void *os::dll_load(const char *filename, char *ebuf, int ebuflen) { void* result = nullptr; const char old_extension[] = ".so"; const char new_extension[] = ".a"; // First try to load the existing file. int eno = 0; result = dll_load_library(filename, &eno, ebuf, ebuflen); // If the load fails, we try to reload by changing the extension to .a for .so files only. // Shared object in .so format dont have braces, hence they get removed for archives with members. if (result == nullptr && eno == ENOENT) { const char* pointer_to_dot = strrchr(filename, '.'); if (pointer_to_dot != nullptr && strcmp(pointer_to_dot, old_extension) == 0) { STATIC_ASSERT(sizeof(old_extension) >= sizeof(new_extension)); char* tmp_path = os::strdup(filename); size_t prefix_size = pointer_delta(pointer_to_dot, filename, 1); os::snprintf(tmp_path + prefix_size, sizeof(old_extension), "%s", new_extension); result = dll_load_library(tmp_path, &eno, ebuf, ebuflen); os::free(tmp_path); } } return result; } void os::print_dll_info(outputStream *st) { st->print_cr("Dynamic libraries:"); LoadedLibraries::print(st); } void os::get_summary_os_info(char* buf, size_t buflen) { // There might be something more readable than uname results for AIX. struct utsname name; uname(&name); snprintf(buf, buflen, "%s %s", name.release, name.version); } int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { if (!LoadedLibraries::for_each(callback, param)) { return -1; } return 0; } void os::print_os_info_brief(outputStream* st) { uint32_t ver = os::Aix::os_version(); st->print_cr("AIX kernel version %u.%u.%u.%u", (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); os::Posix::print_uname_info(st); // Linux uses print_libversion_info(st); here. } void os::print_os_info(outputStream* st) { st->print_cr("OS:"); os::Posix::print_uname_info(st); uint32_t ver = os::Aix::os_version(); st->print_cr("AIX kernel version %u.%u.%u.%u", (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); os::Posix::print_uptime_info(st); os::Posix::print_rlimit_info(st); os::Posix::print_load_average(st); // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process. long tmax = sysconf(_SC_THREAD_THREADS_MAX); st->print_cr("maximum #threads within a process:%ld", tmax); // print wpar info libperfstat::wparinfo_t wi; if (libperfstat::get_wparinfo(&wi)) { st->print_cr("wpar info"); st->print_cr("name: %s", wi.name); st->print_cr("id: %d", wi.wpar_id); st->print_cr("type: %s", (wi.app_wpar ? "application" : "system")); } VM_Version::print_platform_virtualization_info(st); } void os::print_memory_info(outputStream* st) { st->print_cr("Memory:"); st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s", describe_pagesize(g_multipage_support.pagesize)); st->print_cr(" Data page size (C-Heap, bss, etc): %s", describe_pagesize(g_multipage_support.datapsize)); st->print_cr(" Text page size: %s", describe_pagesize(g_multipage_support.textpsize)); st->print_cr(" Thread stack page size (pthread): %s", describe_pagesize(g_multipage_support.pthr_stack_pagesize)); st->print_cr(" Can use 64K pages with mmap memory: %s", (g_multipage_support.can_use_64K_mmap_pages ? "yes" :"no")); st->print_cr(" Default shared memory page size: %s", describe_pagesize(g_multipage_support.shmpsize)); st->print_cr(" Can use 64K pages dynamically with shared memory: %s", (g_multipage_support.can_use_64K_pages ? "yes" :"no")); st->print_cr(" Can use 16M pages dynamically with shared memory: %s", (g_multipage_support.can_use_16M_pages ? "yes" :"no")); st->print_cr(" Multipage error: %d", g_multipage_support.error); st->cr(); st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size())); // print out LDR_CNTRL because it affects the default page sizes const char* const ldr_cntrl = ::getenv("LDR_CNTRL"); st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : ""); // Print out EXTSHM because it is an unsupported setting. const char* const extshm = ::getenv("EXTSHM"); st->print_cr(" EXTSHM=%s.", extshm ? extshm : ""); if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) { st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***"); } // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks. const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES"); st->print_cr(" AIXTHREAD_GUARDPAGES=%s.", aixthread_guardpages ? aixthread_guardpages : ""); st->cr(); os::Aix::meminfo_t mi; if (os::Aix::get_meminfo(&mi)) { st->print_cr("physical total : %zu", mi.real_total); st->print_cr("physical free : %zu", mi.real_free); st->print_cr("swap total : %zu", mi.pgsp_total); st->print_cr("swap free : %zu", mi.pgsp_free); } st->cr(); // Print program break. st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup)); address brk_now = (address)::sbrk(0); if (brk_now != (address)-1) { st->print_cr("Program break now : " PTR_FORMAT " (distance: %zuk).", p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K)); } st->print_cr("MaxExpectedDataSegmentSize : %zuk.", MaxExpectedDataSegmentSize / K); st->cr(); // Print segments allocated with os::reserve_memory. st->print_cr("internal virtual memory regions used by vm:"); vmembk_print_on(st); } // Get a string for the cpuinfo that is a summary of the cpu type void os::get_summary_cpu_info(char* buf, size_t buflen) { // read _system_configuration.version switch (_system_configuration.version) { case PV_11: strncpy(buf, "Power PC 11", buflen); break; case PV_10: strncpy(buf, "Power PC 10", buflen); break; case PV_9: strncpy(buf, "Power PC 9", buflen); break; case PV_8: strncpy(buf, "Power PC 8", buflen); break; case PV_8_Compat: strncpy(buf, "PV_8_Compat", buflen); break; case PV_9_Compat: strncpy(buf, "PV_9_Compat", buflen); break; case PV_10_Compat: strncpy(buf, "PV_10_Compat", buflen); break; case PV_11_Compat: strncpy(buf, "PV_11_Compat", buflen); break; default: strncpy(buf, "unknown", buflen); } } void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { // Nothing to do beyond of what os::print_cpu_info() does. } //////////////////////////////////////////////////////////////////////////////// // Virtual Memory // We need to keep small simple bookkeeping for os::reserve_memory and friends. #define VMEM_MAPPED 1 #define VMEM_SHMATED 2 struct vmembk_t { int type; // 1 - mmap, 2 - shmat char* addr; size_t size; // Real size, may be larger than usersize. size_t pagesize; // page size of area vmembk_t* next; bool contains_addr(char* p) const { return p >= addr && p < (addr + size); } bool contains_range(char* p, size_t s) const { return contains_addr(p) && contains_addr(p + s - 1); } void print_on(outputStream* os) const { os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (%zu" " bytes, %ld %s pages), %s", p2i(addr), p2i(addr) + size - 1, size, size / pagesize, describe_pagesize(pagesize), (type == VMEM_SHMATED ? "shmat" : "mmap") ); } // Check that range is a sub range of memory block (or equal to memory block); // also check that range is fully page aligned to the page size if the block. void assert_is_valid_subrange(char* p, size_t s) const { if (!contains_range(p, s)) { fatal(RANGEFMT " is not a sub range of " RANGEFMT, RANGEFMTARGS(p, s), RANGEFMTARGS(addr, size)); } if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) { fatal("range " RANGEFMT " is not aligned to pagesize (%lu)", RANGEFMTARGS(p, s), (unsigned long)pagesize); } } }; static struct { vmembk_t* first; MiscUtils::CritSect cs; } vmem; static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) { vmembk_t* p = (vmembk_t*) permit_forbidden_function::malloc(sizeof(vmembk_t)); assert0(p); if (p) { MiscUtils::AutoCritSect lck(&vmem.cs); p->addr = addr; p->size = size; p->pagesize = pagesize; p->type = type; p->next = vmem.first; vmem.first = p; } } static vmembk_t* vmembk_find(char* addr) { MiscUtils::AutoCritSect lck(&vmem.cs); for (vmembk_t* p = vmem.first; p; p = p->next) { if (p->addr <= addr && (p->addr + p->size) > addr) { return p; } } return nullptr; } static void vmembk_remove(vmembk_t* p0) { MiscUtils::AutoCritSect lck(&vmem.cs); assert0(p0); assert0(vmem.first); // List should not be empty. for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) { if (*pp == p0) { *pp = p0->next; permit_forbidden_function::free(p0); return; } } assert0(false); // Not found? } static void vmembk_print_on(outputStream* os) { MiscUtils::AutoCritSect lck(&vmem.cs); for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) { vmi->print_on(os); os->cr(); } } // Reserve and attach a section of System V memory. // If is not null, function will attempt to attach the memory at the given // address. Failing that, it will attach the memory anywhere. // If is null, function will attach the memory anywhere. static char* reserve_shmated_memory (size_t bytes, char* requested_addr) { trcVerbose("reserve_shmated_memory %zu bytes, wishaddress " PTR_FORMAT "...", bytes, p2i(requested_addr)); // We must prevent anyone from attaching too close to the // BRK because that may cause malloc OOM. if (requested_addr != nullptr && is_close_to_brk((address)requested_addr)) { log_info(os, map)("Wish address " PTR_FORMAT " is too close to the BRK segment.", p2i(requested_addr)); // Since we treat an attach to the wrong address as an error later anyway, // we return null here return nullptr; } // Align size of shm up to 64K to avoid errors if we later try to change the page size. const size_t size = align_up(bytes, 64*K); // Reserve the shared segment. int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR); if (shmid == -1) { ErrnoPreserver ep; log_trace(os, map)("shmget(.., %zu, ..) failed (errno=%s).", size, os::strerror(ep.saved_errno())); return nullptr; } // Important note: // It is very important that we, upon leaving this function, do not leave a shm segment alive. // We must right after attaching it remove it from the system. System V shm segments are global and // survive the process. // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A). struct shmid_ds shmbuf; memset(&shmbuf, 0, sizeof(shmbuf)); shmbuf.shm_pagesize = 64*K; if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) { assert(false, "Failed to set page size (need %zu" " 64K pages) - shmctl failed. (errno=%s).", size / (64 * K), os::strerror(os::get_last_error())); } // Now attach the shared segment. // Note that we deliberately *don't* pass SHM_RND. The contract of os::attempt_reserve_memory_at() - // which invokes this function with a request address != nullptr - is to map at the specified address // excactly, or to fail. If the caller passed us an address that is not usable (aka not a valid segment // boundary), shmat should not round down the address, or think up a completely new one. // (In places where this matters, e.g. when reserving the heap, we take care of passing segment-aligned // addresses on Aix. See, e.g., ReservedHeapSpace. char* const addr = (char*) shmat(shmid, requested_addr, 0); const int errno_shmat = errno; // (A) Right after shmat and before handing shmat errors delete the shm segment. if (::shmctl(shmid, IPC_RMID, nullptr) == -1) { ErrnoPreserver ep; log_trace(os, map)("shmctl(%u, IPC_RMID) failed (errno=%s)\n", shmid, os::strerror(ep.saved_errno())); assert(false, "failed to remove shared memory segment!"); } // Handle shmat error. If we failed to attach, just return. if (addr == (char*)-1) { ErrnoPreserver ep; log_trace(os, map)("Failed to attach segment at " PTR_FORMAT " (errno=%s).", p2i(requested_addr), os::strerror(ep.saved_errno())); return nullptr; } // Just for info: query the real page size. In case setting the page size did not // work (see above), the system may have given us something other then 4K (LDR_CNTRL). const size_t real_pagesize = os::Aix::query_pagesize(addr); if (real_pagesize != (size_t)shmbuf.shm_pagesize) { log_trace(os, map)("pagesize is, surprisingly, %zu", real_pagesize); } if (addr) { log_trace(os, map)("shm-allocated succeeded: " RANGEFMT " (%zu %s pages)", RANGEFMTARGS(addr, size), size / real_pagesize, describe_pagesize(real_pagesize)); } else { if (requested_addr != nullptr) { log_trace(os, map)("shm-allocate failed: " RANGEFMT, RANGEFMTARGS(requested_addr, size)); } else { log_trace(os, map)("failed to shm-allocate %zu" " bytes at any address.", size); } } // book-keeping vmembk_add(addr, size, real_pagesize, VMEM_SHMATED); assert0(is_aligned_to(addr, os::vm_page_size())); return addr; } static bool release_shmated_memory(char* addr, size_t size) { trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1)); bool rc = false; // TODO: is there a way to verify shm size without doing bookkeeping? if (::shmdt(addr) != 0) { ErrnoPreserver ep; log_trace(os, map)("shmdt failed: " RANGEFMT " errno=(%s)", RANGEFMTARGS(addr, size), os::strerror(ep.saved_errno())); } else { log_trace(os, map)("shmdt succeded: " RANGEFMT, RANGEFMTARGS(addr, size)); rc = true; } return rc; } static bool uncommit_shmated_memory(char* addr, size_t size) { trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1)); const int rc = disclaim64(addr, size, DISCLAIM_ZEROMEM); if (rc != 0) { ErrnoPreserver ep; log_warning(os)("disclaim64(" PTR_FORMAT ", %zu) failed, %s\n", p2i(addr), size, os::strerror(ep.saved_errno())); return false; } return true; } //////////////////////////////// mmap-based routines ///////////////////////////////// // Reserve memory via mmap. // If is given, an attempt is made to attach at the given address. // Failing that, memory is allocated at any address. static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) { trcVerbose("reserve_mmaped_memory %zu bytes, wishaddress " PTR_FORMAT "...", bytes, p2i(requested_addr)); if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) { log_trace(os, map)("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr)); return nullptr; } // We must prevent anyone from attaching too close to the // BRK because that may cause malloc OOM. if (requested_addr != nullptr && is_close_to_brk((address)requested_addr)) { log_trace(os, map)("Wish address " PTR_FORMAT " is too close to the BRK segment.", p2i(requested_addr)); // Since we treat an attach to the wrong address as an error later anyway, // we return null here return nullptr; } // In 64K mode, we lie and claim the global page size (os::vm_page_size()) is 64K // (complicated story). This mostly works just fine since 64K is a multiple of the // actual 4K lowest page size. Only at a few seams light shines thru, e.g. when // calling mmap. mmap will return memory aligned to the lowest pages size - 4K - // so we must make sure - transparently - that the caller only ever sees 64K // aligned mapping start addresses. const size_t alignment = os::vm_page_size(); // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode). const size_t size = align_up(bytes, os::vm_page_size()); // alignment: Allocate memory large enough to include an aligned range of the right size and // cut off the leading and trailing waste pages. assert0(alignment != 0 && is_aligned_to(alignment, os::vm_page_size())); // see above const size_t extra_size = size + alignment; // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to // later use msync(MS_INVALIDATE) (see os::uncommit_memory). int flags = MAP_ANONYMOUS | MAP_SHARED; if (os::vm_page_size() == 64*K && g_multipage_support.can_use_64K_mmap_pages) { flags |= MAP_ANON_64K; } // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what // it means if wishaddress is given but MAP_FIXED is not set. // // Important! Behaviour differs depending on whether SPEC1170 mode is active or not. // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings. // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will // get clobbered. if (requested_addr != nullptr) { if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour flags |= MAP_FIXED; } } char* addr = (char*)::mmap(requested_addr, extra_size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0); if (addr == MAP_FAILED) { ErrnoPreserver ep; log_trace(os, map)("mmap failed: " RANGEFMT " errno=(%s)", RANGEFMTARGS(requested_addr, size), os::strerror(ep.saved_errno())); return nullptr; } else if (requested_addr != nullptr && addr != requested_addr) { log_trace(os, map)("mmap succeeded: " RANGEFMT ", but at a different address than" "requested (" PTR_FORMAT "), will unmap", RANGEFMTARGS(requested_addr, size), p2i(addr)); ::munmap(addr, extra_size); return nullptr; } // Handle alignment. char* const addr_aligned = align_up(addr, alignment); const size_t waste_pre = addr_aligned - addr; char* const addr_aligned_end = addr_aligned + size; const size_t waste_post = extra_size - waste_pre - size; if (waste_pre > 0) { ::munmap(addr, waste_pre); } if (waste_post > 0) { ::munmap(addr_aligned_end, waste_post); } addr = addr_aligned; trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (%zu bytes)", p2i(addr), p2i(addr + bytes), bytes); // bookkeeping if (os::vm_page_size() == 64*K && g_multipage_support.can_use_64K_mmap_pages) { vmembk_add(addr, size, 64*K, VMEM_MAPPED); } else { vmembk_add(addr, size, 4*K, VMEM_MAPPED); } // Test alignment, see above. assert0(is_aligned_to(addr, os::vm_page_size())); return addr; } static bool release_mmaped_memory(char* addr, size_t size) { assert0(is_aligned_to(addr, os::vm_page_size())); assert0(is_aligned_to(size, os::vm_page_size())); trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1)); bool rc = false; if (::munmap(addr, size) != 0) { ErrnoPreserver ep; log_trace(os, map)("munmap failed: " RANGEFMT " errno=(%s)", RANGEFMTARGS(addr, size), os::strerror(ep.saved_errno())); rc = false; } else { log_trace(os, map)("munmap succeeded: " RANGEFMT, RANGEFMTARGS(addr, size)); rc = true; } return rc; } static bool uncommit_mmaped_memory(char* addr, size_t size) { assert0(is_aligned_to(addr, os::vm_page_size())); assert0(is_aligned_to(size, os::vm_page_size())); trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1)); bool rc = false; // Uncommit mmap memory with msync MS_INVALIDATE. if (::msync(addr, size, MS_INVALIDATE) != 0) { ErrnoPreserver ep; log_trace(os, map)("msync failed: " RANGEFMT " errno=(%s)", RANGEFMTARGS(addr, size), os::strerror(ep.saved_errno())); rc = false; } else { log_trace(os, map)("msync succeeded: " RANGEFMT, RANGEFMTARGS(addr, size)); rc = true; } return rc; } #ifdef PRODUCT static void warn_fail_commit_memory(char* addr, size_t size, bool exec, int err) { warning("INFO: os::commit_memory(" PTR_FORMAT ", %zu, %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec, os::errno_name(err), err); } #endif void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, const char* mesg) { assert(mesg != nullptr, "mesg must be specified"); if (!pd_commit_memory(addr, size, exec)) { // Add extra info in product mode for vm_exit_out_of_memory(): PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); } } bool os::pd_commit_memory(char* addr, size_t size, bool exec) { assert(is_aligned_to(addr, os::vm_page_size()), "addr " PTR_FORMAT " not aligned to vm_page_size (%zu)", p2i(addr), os::vm_page_size()); assert(is_aligned_to(size, os::vm_page_size()), "size " PTR_FORMAT " not aligned to vm_page_size (%zu)", size, os::vm_page_size()); vmembk_t* const vmi = vmembk_find(addr); guarantee0(vmi); vmi->assert_is_valid_subrange(addr, size); log_info(os)("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1)); if (UseExplicitCommit) { // AIX commits memory on touch. So, touch all pages to be committed. for (char* p = addr; p < (addr + size); p += 4*K) { *p = '\0'; } } return true; } bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) { return pd_commit_memory(addr, size, exec); } void os::pd_commit_memory_or_exit(char* addr, size_t size, size_t alignment_hint, bool exec, const char* mesg) { // Alignment_hint is ignored on this OS. pd_commit_memory_or_exit(addr, size, exec, mesg); } bool os::pd_uncommit_memory(char* addr, size_t size, bool exec) { assert(is_aligned_to(addr, os::vm_page_size()), "addr " PTR_FORMAT " not aligned to vm_page_size (%zu)", p2i(addr), os::vm_page_size()); assert(is_aligned_to(size, os::vm_page_size()), "size " PTR_FORMAT " not aligned to vm_page_size (%zu)", size, os::vm_page_size()); // Dynamically do different things for mmap/shmat. const vmembk_t* const vmi = vmembk_find(addr); guarantee0(vmi); vmi->assert_is_valid_subrange(addr, size); if (vmi->type == VMEM_SHMATED) { return uncommit_shmated_memory(addr, size); } else { return uncommit_mmaped_memory(addr, size); } } bool os::pd_create_stack_guard_pages(char* addr, size_t size) { // Do not call this; no need to commit stack pages on AIX. ShouldNotReachHere(); return true; } bool os::remove_stack_guard_pages(char* addr, size_t size) { // Do not call this; no need to commit stack pages on AIX. ShouldNotReachHere(); return true; } void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } void os::pd_disclaim_memory(char *addr, size_t bytes) { } size_t os::pd_pretouch_memory(void* first, void* last, size_t page_size) { return page_size; } void os::numa_make_global(char *addr, size_t bytes) { } void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } bool os::numa_topology_changed() { return false; } size_t os::numa_get_groups_num() { return 1; } int os::numa_get_group_id() { return 0; } size_t os::numa_get_leaf_groups(uint *ids, size_t size) { if (size > 0) { ids[0] = 0; return 1; } return 0; } int os::numa_get_group_id_for_address(const void* address) { return 0; } bool os::numa_get_group_ids_for_range(const void** addresses, int* lgrp_ids, size_t count) { return false; } // Reserves and attaches a shared memory segment. char* os::pd_reserve_memory(size_t bytes, bool exec) { // Always round to os::vm_page_size(), which may be larger than 4K. bytes = align_up(bytes, os::vm_page_size()); // In 4K mode always use mmap. // In 64K mode allocate with mmap if it supports 64K pages, otherwise use 64K shmatted. if (os::vm_page_size() == 4*K || g_multipage_support.can_use_64K_mmap_pages) { return reserve_mmaped_memory(bytes, nullptr /* requested_addr */); } else { return reserve_shmated_memory(bytes, nullptr /* requested_addr */); } } bool os::pd_release_memory(char* addr, size_t size) { // Dynamically do different things for mmap/shmat. vmembk_t* const vmi = vmembk_find(addr); guarantee0(vmi); vmi->assert_is_valid_subrange(addr, size); // Always round to os::vm_page_size(), which may be larger than 4K. size = align_up(size, os::vm_page_size()); addr = align_up(addr, os::vm_page_size()); bool rc = false; bool remove_bookkeeping = false; if (vmi->type == VMEM_SHMATED) { // For shmatted memory, we do: // - If user wants to release the whole range, release the memory (shmdt). // - If user only wants to release a partial range, uncommit (disclaim) that // range. That way, at least, we do not use memory anymore (bust still page // table space). if (addr == vmi->addr && size == vmi->size) { rc = release_shmated_memory(addr, size); remove_bookkeeping = true; } else { rc = uncommit_shmated_memory(addr, size); } } else { // In mmap-mode: // - If the user wants to release the full range, we do that and remove the mapping. // - If the user wants to release part of the range, we release that part, but need // to adjust bookkeeping. assert(is_aligned(size, 4 * K), "Sanity"); rc = release_mmaped_memory(addr, size); if (addr == vmi->addr && size == vmi->size) { remove_bookkeeping = true; } else { if (addr == vmi->addr && size < vmi->size) { // Chopped from head vmi->addr += size; vmi->size -= size; } else if (addr + size == vmi->addr + vmi->size) { // Chopped from tail vmi->size -= size; } else { // releasing a mapping in the middle of the original mapping: // For now we forbid this, since this is an invalid scenario // (the bookkeeping is easy enough to fix if needed but there // is no use case for it; any occurrence is likely an error. ShouldNotReachHere(); } } } // update bookkeeping if (rc && remove_bookkeeping) { vmembk_remove(vmi); } return rc; } static bool checked_mprotect(char* addr, size_t size, int prot) { // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will // not tell me if protection failed when trying to protect an un-protectable range. // // This means if the memory was allocated using shmget/shmat, protection won't work // but mprotect will still return 0: // // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm Events::log_memprotect(nullptr, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); bool rc = ::mprotect(addr, size, prot) == 0 ? true : false; if (!rc) { const char* const s_errno = os::errno_name(errno); warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", p2i(addr), p2i(addr) + size, prot, s_errno); return false; } // mprotect success check // // Mprotect said it changed the protection but can I believe it? // // To be sure I need to check the protection afterwards. Try to // read from protected memory and check whether that causes a segfault. // if (!os::Aix::xpg_sus_mode()) { const bool read_protected = (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; if (prot & PROT_READ) { rc = !read_protected; } else { rc = read_protected; } } assert(rc == true, "mprotect failed."); return rc; } // Set protections specified bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) { unsigned int p = 0; switch (prot) { case MEM_PROT_NONE: p = PROT_NONE; break; case MEM_PROT_READ: p = PROT_READ; break; case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; default: ShouldNotReachHere(); } // is_committed is unused. return checked_mprotect(addr, size, p); } bool os::guard_memory(char* addr, size_t size) { return checked_mprotect(addr, size, PROT_NONE); } bool os::unguard_memory(char* addr, size_t size) { return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC); } // Large page support static size_t _large_page_size = 0; // Enable large page support if OS allows that. void os::large_page_init() { return; // Nothing to do. See query_multipage_support and friends. } char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, size_t page_size, char* req_addr, bool exec) { fatal("os::reserve_memory_special should not be called on AIX."); return nullptr; } bool os::pd_release_memory_special(char* base, size_t bytes) { fatal("os::release_memory_special should not be called on AIX."); return false; } size_t os::large_page_size() { return _large_page_size; } bool os::can_commit_large_page_memory() { // Does not matter, we do not support huge pages. return false; } char* os::pd_attempt_map_memory_to_file_at(char* requested_addr, size_t bytes, int file_desc) { assert(file_desc >= 0, "file_desc is not valid"); char* result = nullptr; // Always round to os::vm_page_size(), which may be larger than 4K. bytes = align_up(bytes, os::vm_page_size()); result = reserve_mmaped_memory(bytes, requested_addr); if (result != nullptr) { if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == nullptr) { vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); } } return result; } // Reserve memory at an arbitrary address, only if that area is // available (and not reserved for something else). char* os::pd_attempt_reserve_memory_at(char* requested_addr, size_t bytes, bool exec) { char* addr = nullptr; // Always round to os::vm_page_size(), which may be larger than 4K. bytes = align_up(bytes, os::vm_page_size()); // In 4K mode always use mmap. // In 64K mode allocate with mmap if it supports 64K pages, otherwise use 64K shmatted. if (os::vm_page_size() == 4*K || g_multipage_support.can_use_64K_mmap_pages) { return reserve_mmaped_memory(bytes, requested_addr); } else { return reserve_shmated_memory(bytes, requested_addr); } return addr; } size_t os::vm_min_address() { // On AIX, we need to make sure we don't block the sbrk. However, this is // done at actual reservation time, where we honor a "no-mmap" area following // the break. See MaxExpectedDataSegmentSize. So we can return a very low // address here. assert(is_aligned(_vm_min_address_default, os::vm_allocation_granularity()), "Sanity"); return _vm_min_address_default; } //////////////////////////////////////////////////////////////////////////////// // thread priority support // From AIX manpage to pthread_setschedparam // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp? // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm): // // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the // range from 40 to 80, where 40 is the least favored priority and 80 // is the most favored." // // (Actually, I doubt this even has an impact on AIX, as we do kernel // scheduling there; however, this still leaves iSeries.) // int os::java_to_os_priority[CriticalPriority + 1] = { 54, // 0 Entry should never be used 55, // 1 MinPriority 55, // 2 56, // 3 56, // 4 57, // 5 NormPriority 57, // 6 58, // 7 58, // 8 59, // 9 NearMaxPriority 60, // 10 MaxPriority 60 // 11 CriticalPriority }; static int prio_init() { if (ThreadPriorityPolicy == 1) { if (geteuid() != 0) { if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy) && !FLAG_IS_JIMAGE_RESOURCE(ThreadPriorityPolicy)) { warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \ "e.g., being the root user. If the necessary permission is not " \ "possessed, changes to priority will be silently ignored."); } } } if (UseCriticalJavaThreadPriority) { os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; } return 0; } OSReturn os::set_native_priority(Thread* thread, int newpri) { if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; pthread_t thr = thread->osthread()->pthread_id(); int policy = SCHED_OTHER; struct sched_param param; param.sched_priority = newpri; int ret = pthread_setschedparam(thr, policy, ¶m); if (ret != 0) { log_warning(os)("Could not change priority for thread %d to %d (error %d, %s)", (int)thr, newpri, ret, os::errno_name(ret)); } return (ret == 0) ? OS_OK : OS_ERR; } OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { *priority_ptr = java_to_os_priority[NormPriority]; return OS_OK; } pthread_t thr = thread->osthread()->pthread_id(); int policy = SCHED_OTHER; struct sched_param param; int ret = pthread_getschedparam(thr, &policy, ¶m); *priority_ptr = param.sched_priority; return (ret == 0) ? OS_OK : OS_ERR; } // To install functions for atexit system call extern "C" { static void perfMemory_exit_helper() { perfMemory_exit(); } } static void set_page_size(size_t page_size) { OSInfo::set_vm_page_size(page_size); OSInfo::set_vm_allocation_granularity(page_size); } // This is called _before_ the most of global arguments have been parsed. void os::init(void) { // This is basic, we want to know if that ever changes. // (Shared memory boundary is supposed to be a 256M aligned.) assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected"); // Record process break at startup. g_brk_at_startup = (address) ::sbrk(0); assert(g_brk_at_startup != (address) -1, "sbrk failed"); // First off, we need to know the OS level we run on. os::Aix::initialize_os_info(); // Scan environment (SPEC1170 behaviour, etc). os::Aix::scan_environment(); // Probe multipage support. query_multipage_support(); // Act like we only have one page size by eliminating corner cases which // we did not support very well anyway. // We have two input conditions: // 1) Data segment page size. This is controlled by linker setting (datapsize) on the // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker // setting. // Data segment page size is important for us because it defines the thread stack page // size, which is needed for guard page handling, stack banging etc. // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can // and should be allocated with 64k pages. // // So, we do the following: // LDR_CNTRL can_use_64K_pages_dynamically(mmap or shm) what we do remarks // 4K no 4K old systems (aix 5.2) or new systems with AME activated // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings // 64k no --- AIX 5.2 ? --- // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking) // We explicitly leave no option to change page size, because only upgrading would work, // not downgrading (if stack page size is 64k you cannot pretend its 4k). if (g_multipage_support.datapsize == 4*K) { // datapsize = 4K. Data segment, thread stacks are 4K paged. if (g_multipage_support.can_use_64K_pages || g_multipage_support.can_use_64K_mmap_pages) { // .. but we are able to use 64K pages dynamically. // This would be typical for java launchers which are not linked // with datapsize=64K (like, any other launcher but our own). // // In this case it would be smart to allocate the java heap with 64K // to get the performance benefit, and to fake 64k pages for the // data segment (when dealing with thread stacks). // // However, leave a possibility to downgrade to 4K, using // -XX:-Use64KPages. if (Use64KPages) { trcVerbose("64K page mode (faked for data segment)"); set_page_size(64*K); } else { trcVerbose("4K page mode (Use64KPages=off)"); set_page_size(4*K); } } else { // .. and not able to allocate 64k pages dynamically. Here, just // fall back to 4K paged mode and use mmap for everything. trcVerbose("4K page mode"); set_page_size(4*K); FLAG_SET_ERGO(Use64KPages, false); } } else { // datapsize = 64k. Data segment, thread stacks are 64k paged. // This normally means that we can allocate 64k pages dynamically. // (There is one special case where this may be false: EXTSHM=on. // but we decided to not support that mode). assert0(g_multipage_support.can_use_64K_pages || g_multipage_support.can_use_64K_mmap_pages); set_page_size(64*K); trcVerbose("64K page mode"); FLAG_SET_ERGO(Use64KPages, true); } // For now UseLargePages is just ignored. FLAG_SET_ERGO(UseLargePages, false); _page_sizes.add(os::vm_page_size()); // debug trace trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size())); // Next, we need to initialize libperfstat os::Aix::initialize_libperfstat(); // Reset the perfstat information provided by ODM. libperfstat::perfstat_reset(); // Now initialize basic system properties. Note that for some of the values we // need libperfstat etc. os::Aix::initialize_system_info(); // _main_thread points to the thread that created/loaded the JVM. Aix::_main_thread = pthread_self(); os::Posix::init(); } // This is called _after_ the global arguments have been parsed. jint os::init_2(void) { // This could be set after os::Posix::init() but all platforms // have to set it the same so we have to mirror Solaris. DEBUG_ONLY(os::set_mutex_init_done();) os::Posix::init_2(); trcVerbose("processor count: %d", os::_processor_count); trcVerbose("physical memory: %lu", Aix::_physical_memory); // Initially build up the loaded dll map. LoadedLibraries::reload(); if (Verbose) { trcVerbose("Loaded Libraries: "); LoadedLibraries::print(tty); } if (PosixSignals::init() == JNI_ERR) { return JNI_ERR; } // Check and sets minimum stack sizes against command line options if (set_minimum_stack_sizes() == JNI_ERR) { return JNI_ERR; } // Not supported. FLAG_SET_ERGO(UseNUMA, false); FLAG_SET_ERGO(UseNUMAInterleaving, false); if (MaxFDLimit) { // Set the number of file descriptors to max. print out error // if getrlimit/setrlimit fails but continue regardless. struct rlimit nbr_files; int status = getrlimit(RLIMIT_NOFILE, &nbr_files); if (status != 0) { log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); } else { nbr_files.rlim_cur = nbr_files.rlim_max; status = setrlimit(RLIMIT_NOFILE, &nbr_files); if (status != 0) { log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); } } } if (PerfAllowAtExitRegistration) { // Only register atexit functions if PerfAllowAtExitRegistration is set. // At exit functions can be delayed until process exit time, which // can be problematic for embedded VM situations. Embedded VMs should // call DestroyJavaVM() to assure that VM resources are released. // Note: perfMemory_exit_helper atexit function may be removed in // the future if the appropriate cleanup code can be added to the // VM_Exit VMOperation's doit method. if (atexit(perfMemory_exit_helper) != 0) { warning("os::init_2 atexit(perfMemory_exit_helper) failed"); } } // initialize thread priority policy prio_init(); return JNI_OK; } int os::active_processor_count() { // User has overridden the number of active processors if (ActiveProcessorCount > 0) { log_trace(os)("active_processor_count: " "active processor count set by user : %d", ActiveProcessorCount); return ActiveProcessorCount; } int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); return online_cpus; } void os::set_native_thread_name(const char *name) { // Not yet implemented. return; } //////////////////////////////////////////////////////////////////////////////// // debug support bool os::find(address addr, outputStream* st) { st->print(PTR_FORMAT ": ", p2i(addr)); loaded_module_t lm; if (LoadedLibraries::find_for_text_address(addr, &lm) || LoadedLibraries::find_for_data_address(addr, &lm)) { st->print_cr("%s", lm.path); return true; } return false; } //////////////////////////////////////////////////////////////////////////////// // misc // This does not do anything on Aix. This is basically a hook for being // able to use structured exception handling (thread-local exception filters) // on, e.g., Win32. void os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, JavaCallArguments* args, JavaThread* thread) { f(value, method, args, thread); } // This code originates from JDK's sysOpen and open64_w // from src/solaris/hpi/src/system_md.c int os::open(const char *path, int oflag, int mode) { if (strlen(path) > MAX_PATH - 1) { errno = ENAMETOOLONG; return -1; } // AIX 7.X now supports O_CLOEXEC too, like modern Linux; but we have to be careful, see // IV90804: OPENING A FILE IN AFS WITH O_CLOEXEC FAILS WITH AN EINVAL ERROR APPLIES TO AIX 7100-04 17/04/14 PTF PECHANGE int oflag_with_o_cloexec = oflag | O_CLOEXEC; int fd = ::open(path, oflag_with_o_cloexec, mode); if (fd == -1) { // we might fail in the open call when O_CLOEXEC is set, so try again without (see IV90804) fd = ::open(path, oflag, mode); if (fd == -1) { return -1; } } // If the open succeeded, the file might still be a directory. { struct stat buf64; int ret = ::fstat(fd, &buf64); int st_mode = buf64.st_mode; if (ret != -1) { if ((st_mode & S_IFMT) == S_IFDIR) { errno = EISDIR; ::close(fd); return -1; } } else { ::close(fd); return -1; } } // All file descriptors that are opened in the JVM and not // specifically destined for a subprocess should have the // close-on-exec flag set. If we don't set it, then careless 3rd // party native code might fork and exec without closing all // appropriate file descriptors (e.g. as we do in closeDescriptors in // UNIXProcess.c), and this in turn might: // // - cause end-of-file to fail to be detected on some file // descriptors, resulting in mysterious hangs, or // // - might cause an fopen in the subprocess to fail on a system // suffering from bug 1085341. // Validate that the use of the O_CLOEXEC flag on open above worked. static sig_atomic_t O_CLOEXEC_is_known_to_work = 0; if (O_CLOEXEC_is_known_to_work == 0) { int flags = ::fcntl(fd, F_GETFD); if (flags != -1) { if ((flags & FD_CLOEXEC) != 0) { O_CLOEXEC_is_known_to_work = 1; } else { // it does not work ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); O_CLOEXEC_is_known_to_work = -1; } } } else if (O_CLOEXEC_is_known_to_work == -1) { int flags = ::fcntl(fd, F_GETFD); if (flags != -1) { ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); } } return fd; } // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) // are used by JVM M&M and JVMTI to get user+sys or user CPU time // of a thread. // // current_thread_cpu_time() and thread_cpu_time(Thread*) returns // the fast estimate available on the platform. jlong os::current_thread_cpu_time() { // return user + sys since the cost is the same const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */); assert(n >= 0, "negative CPU time"); return n; } jlong os::thread_cpu_time(Thread* thread) { // consistent with what current_thread_cpu_time() returns const jlong n = os::thread_cpu_time(thread, true /* user + sys */); assert(n >= 0, "negative CPU time"); return n; } jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time); assert(n >= 0, "negative CPU time"); return n; } static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) { bool error = false; jlong sys_time = 0; jlong user_time = 0; // Reimplemented using getthrds64(). // // Works like this: // For the thread in question, get the kernel thread id. Then get the // kernel thread statistics using that id. // // This only works of course when no pthread scheduling is used, // i.e. there is a 1:1 relationship to kernel threads. // On AIX, see AIXTHREAD_SCOPE variable. pthread_t pthtid = thread->osthread()->pthread_id(); // retrieve kernel thread id for the pthread: tid64_t tid = 0; struct __pthrdsinfo pinfo; // I just love those otherworldly IBM APIs which force me to hand down // dummy buffers for stuff I dont care for... char dummy[1]; int dummy_size = sizeof(dummy); if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo), dummy, &dummy_size) == 0) { tid = pinfo.__pi_tid; } else { tty->print_cr("pthread_getthrds_np failed."); error = true; } // retrieve kernel timing info for that kernel thread if (!error) { struct thrdentry64 thrdentry; if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) { sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL; user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL; } else { tty->print_cr("pthread_getthrds_np failed."); error = true; } } if (p_sys_time) { *p_sys_time = sys_time; } if (p_user_time) { *p_user_time = user_time; } if (error) { return false; } return true; } jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { jlong sys_time; jlong user_time; if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) { return -1; } return user_sys_cpu_time ? sys_time + user_time : user_time; } void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { info_ptr->max_value = all_bits_jlong; // will not wrap in less than 64 bits info_ptr->may_skip_backward = false; // elapsed time not wall time info_ptr->may_skip_forward = false; // elapsed time not wall time info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned } void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { info_ptr->max_value = all_bits_jlong; // will not wrap in less than 64 bits info_ptr->may_skip_backward = false; // elapsed time not wall time info_ptr->may_skip_forward = false; // elapsed time not wall time info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned } bool os::is_thread_cpu_time_supported() { return true; } // System loadavg support. Returns -1 if load average cannot be obtained. // For now just return the system wide load average (no processor sets). int os::loadavg(double values[], int nelem) { guarantee(nelem >= 0 && nelem <= 3, "argument error"); guarantee(values, "argument error"); // AIX: use libperfstat libperfstat::cpuinfo_t ci; if (libperfstat::get_cpuinfo(&ci)) { for (int i = 0; i < nelem; i++) { values[i] = ci.loadavg[i]; } } else { return -1; } return nelem; } bool os::is_primordial_thread(void) { if (pthread_self() == (pthread_t)1) { return true; } else { return false; } } // OS recognitions (OS level) call this before calling Aix::os_version() void os::Aix::initialize_os_info() { assert(_os_version == 0, "already called."); struct utsname uts; memset(&uts, 0, sizeof(uts)); strcpy(uts.sysname, "?"); if (::uname(&uts) == -1) { log_warning(os)("uname failed (%d)", errno); guarantee(0, "Could not determine uname information"); } else { log_info(os)("uname says: sysname \"%s\" version \"%s\" release \"%s\" " "node \"%s\" machine \"%s\"\n", uts.sysname, uts.version, uts.release, uts.nodename, uts.machine); const int major = atoi(uts.version); assert(major > 0, "invalid OS version"); const int minor = atoi(uts.release); assert(minor > 0, "invalid OS release"); _os_version = (major << 24) | (minor << 16); char ver_str[20] = {0}; const char* name_str = "unknown OS"; if (strcmp(uts.sysname, "AIX") == 0) { // We run on AIX. We do not support versions older than AIX 7.1. // Determine detailed AIX version: Version, Release, Modification, Fix Level. odmWrapper::determine_os_kernel_version(&_os_version); if (os_version_short() < 0x0701) { log_warning(os)("AIX releases older than AIX 7.1 are not supported."); assert(false, "AIX release too old."); } name_str = "AIX"; jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u", major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF); } else { assert(false, "%s", name_str); } log_info(os)("We run on %s %s", name_str, ver_str); } guarantee(_os_version, "Could not determine AIX release"); } // end: os::Aix::initialize_os_info() // Scan environment for important settings which might effect the VM. // Trace out settings. Warn about invalid settings and/or correct them. // // Must run after os::Aix::initialue_os_info(). void os::Aix::scan_environment() { char* p; int rc; // Warn explicitly if EXTSHM=ON is used. That switch changes how // System V shared memory behaves. One effect is that page size of // shared memory cannot be change dynamically, effectivly preventing // large pages from working. // This switch was needed on AIX 32bit, but on AIX 64bit the general // recommendation is (in OSS notes) to switch it off. p = ::getenv("EXTSHM"); trcVerbose("EXTSHM=%s.", p ? p : ""); if (p && strcasecmp(p, "ON") == 0) { _extshm = 1; log_warning(os)("*** Unsupported mode! Please remove EXTSHM from your environment! ***"); if (!AllowExtshm) { // We allow under certain conditions the user to continue. However, we want this // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means // that the VM is not able to allocate 64k pages for the heap. // We do not want to run with reduced performance. vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment."); } } else { _extshm = 0; } // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs. // Not tested, not supported. // // Note that it might be worth the trouble to test and to require it, if only to // get useful return codes for mprotect. // // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before // exec() ? before loading the libjvm ? ....) p = ::getenv("XPG_SUS_ENV"); trcVerbose("XPG_SUS_ENV=%s.", p ? p : ""); if (p && strcmp(p, "ON") == 0) { _xpg_sus_mode = 1; log_warning(os)("Unsupported setting: XPG_SUS_ENV=ON"); // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to // clobber address ranges. If we ever want to support that, we have to do some // testing first. guarantee(false, "XPG_SUS_ENV=ON not supported"); } else { _xpg_sus_mode = 0; } p = ::getenv("LDR_CNTRL"); trcVerbose("LDR_CNTRL=%s.", p ? p : ""); p = ::getenv("AIXTHREAD_GUARDPAGES"); trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : ""); } // end: os::Aix::scan_environment() void os::Aix::initialize_libperfstat() { if (!libperfstat::init()) { log_warning(os)("libperfstat initialization failed."); assert(false, "libperfstat initialization failed"); } else { trcVerbose("libperfstat initialized."); } } bool os::Aix::supports_64K_mmap_pages() { return g_multipage_support.can_use_64K_mmap_pages; } ///////////////////////////////////////////////////////////////////////////// // thread stack // Get the current stack base and size from the OS (actually, the pthread library). // Note: base usually not page aligned. // Returned size is such that (base - size) is always aligned to page size. void os::current_stack_base_and_size(address* stack_base, size_t* stack_size) { AixMisc::stackbounds_t bounds; bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); guarantee(rc, "Unable to retrieve stack bounds."); *stack_base = bounds.base; // Align the reported stack size such that the stack low address // is aligned to page size (Note: base is usually not and we do not care). // We need to do this because caller code will assume stack low address is // page aligned and will place guard pages without checking. address low = bounds.base - bounds.size; address low_aligned = (address)align_up(low, os::vm_page_size()); *stack_size = bounds.base - low_aligned; } // Get the default path to the core file // Returns the length of the string int os::get_core_path(char* buffer, size_t bufferSize) { const char* p = get_current_directory(buffer, bufferSize); if (p == nullptr) { assert(p != nullptr, "failed to get current directory"); return 0; } jio_snprintf(buffer, bufferSize, "%s/core or core.%d", p, current_process_id()); return checked_cast(strlen(buffer)); } bool os::start_debugging(char *buf, int buflen) { int len = (int)strlen(buf); char *p = &buf[len]; jio_snprintf(p, buflen -len, "\n\n" "Do you want to debug the problem?\n\n" "To debug, run 'dbx -a %d'; then switch to thread tid %zd, k-tid %zd\n" "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" "Otherwise, press RETURN to abort...", os::current_process_id(), os::current_thread_id(), thread_self()); bool yes = os::message_box("Unexpected Error", buf); if (yes) { // yes, user asked VM to launch debugger jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); os::fork_and_exec(buf); yes = false; } return yes; } static inline time_t get_mtime(const char* filename) { struct stat st; int ret = os::stat(filename, &st); assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); return st.st_mtime; } int os::compare_file_modified_times(const char* file1, const char* file2) { time_t t1 = get_mtime(file1); time_t t2 = get_mtime(file2); return primitive_compare(t1, t2); } bool os::supports_map_sync() { return false; } void os::print_memory_mappings(char* addr, size_t bytes, outputStream* st) {} #if INCLUDE_JFR void os::jfr_report_memory_info() {} #endif // INCLUDE_JFR