author | johnc |
Wed, 29 Aug 2012 13:02:54 -0700 | |
changeset 13518 | 86a9027340fb |
parent 13195 | be27e1b6a4b9 |
child 14286 | ec9e76cd402f |
permissions | -rw-r--r-- |
10565 | 1 |
/* |
13518
86a9027340fb
7194409: os::javaTimeNanos() shows hot on CPU_CLK_UNHALTED profiles
johnc
parents:
13195
diff
changeset
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* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#ifndef OS_BSD_VM_OS_BSD_HPP |
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#define OS_BSD_VM_OS_BSD_HPP |
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||
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// Bsd_OS defines the interface to Bsd operating systems |
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||
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/* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */ |
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typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); |
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||
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#ifdef __APPLE__ |
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// Mac OS X doesn't support clock_gettime. Stub out the type, it is |
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// unused |
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typedef int clockid_t; |
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#endif |
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||
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class Bsd { |
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friend class os; |
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||
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// For signal-chaining |
|
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#define MAXSIGNUM 32 |
|
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static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions |
|
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static unsigned int sigs; // mask of signals that have |
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// preinstalled signal handlers |
|
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static bool libjsig_is_loaded; // libjsig that interposes sigaction(), |
|
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// __sigaction(), signal() is loaded |
|
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static struct sigaction *(*get_signal_action)(int); |
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static struct sigaction *get_preinstalled_handler(int); |
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static void save_preinstalled_handler(int, struct sigaction&); |
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||
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static void check_signal_handler(int sig); |
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||
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// For signal flags diagnostics |
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static int sigflags[MAXSIGNUM]; |
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||
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static int (*_clock_gettime)(clockid_t, struct timespec *); |
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#ifndef _ALLBSD_SOURCE |
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static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); |
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static address _initial_thread_stack_bottom; |
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static uintptr_t _initial_thread_stack_size; |
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static const char *_glibc_version; |
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static const char *_libpthread_version; |
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||
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static bool _is_floating_stack; |
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static bool _is_NPTL; |
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static bool _supports_fast_thread_cpu_time; |
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#endif |
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||
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static GrowableArray<int>* _cpu_to_node; |
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||
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protected: |
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||
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static julong _physical_memory; |
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static pthread_t _main_thread; |
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#ifndef _ALLBSD_SOURCE |
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static Mutex* _createThread_lock; |
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#endif |
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static int _page_size; |
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static julong available_memory(); |
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static julong physical_memory() { return _physical_memory; } |
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static void initialize_system_info(); |
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#ifndef _ALLBSD_SOURCE |
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static void set_glibc_version(const char *s) { _glibc_version = s; } |
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static void set_libpthread_version(const char *s) { _libpthread_version = s; } |
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#endif |
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static bool supports_variable_stack_size(); |
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#ifndef _ALLBSD_SOURCE |
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static void set_is_NPTL() { _is_NPTL = true; } |
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static void set_is_BsdThreads() { _is_NPTL = false; } |
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static void set_is_floating_stack() { _is_floating_stack = true; } |
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#endif |
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static void rebuild_cpu_to_node_map(); |
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static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } |
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static bool hugetlbfs_sanity_check(bool warn, size_t page_size); |
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public: |
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static void init_thread_fpu_state(); |
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#ifndef _ALLBSD_SOURCE |
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static int get_fpu_control_word(); |
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static void set_fpu_control_word(int fpu_control); |
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#endif |
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static pthread_t main_thread(void) { return _main_thread; } |
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#ifndef _ALLBSD_SOURCE |
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// returns kernel thread id (similar to LWP id on Solaris), which can be |
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// used to access /proc |
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static pid_t gettid(); |
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static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } |
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static Mutex* createThread_lock(void) { return _createThread_lock; } |
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#endif |
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static void hotspot_sigmask(Thread* thread); |
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#ifndef _ALLBSD_SOURCE |
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static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } |
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static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } |
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#endif |
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static bool is_initial_thread(void); |
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||
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static int page_size(void) { return _page_size; } |
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static void set_page_size(int val) { _page_size = val; } |
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static address ucontext_get_pc(ucontext_t* uc); |
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static intptr_t* ucontext_get_sp(ucontext_t* uc); |
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static intptr_t* ucontext_get_fp(ucontext_t* uc); |
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// For Analyzer Forte AsyncGetCallTrace profiling support: |
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// |
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// This interface should be declared in os_bsd_i486.hpp, but |
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// that file provides extensions to the os class and not the |
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// Bsd class. |
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static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, |
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intptr_t** ret_sp, intptr_t** ret_fp); |
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// This boolean allows users to forward their own non-matching signals |
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// to JVM_handle_bsd_signal, harmlessly. |
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static bool signal_handlers_are_installed; |
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static int get_our_sigflags(int); |
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static void set_our_sigflags(int, int); |
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static void signal_sets_init(); |
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static void install_signal_handlers(); |
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static void set_signal_handler(int, bool); |
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static bool is_sig_ignored(int sig); |
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static sigset_t* unblocked_signals(); |
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static sigset_t* vm_signals(); |
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static sigset_t* allowdebug_blocked_signals(); |
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// For signal-chaining |
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static struct sigaction *get_chained_signal_action(int sig); |
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static bool chained_handler(int sig, siginfo_t* siginfo, void* context); |
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#ifndef _ALLBSD_SOURCE |
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// GNU libc and libpthread version strings |
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static const char *glibc_version() { return _glibc_version; } |
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static const char *libpthread_version() { return _libpthread_version; } |
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// NPTL or BsdThreads? |
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static bool is_BsdThreads() { return !_is_NPTL; } |
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static bool is_NPTL() { return _is_NPTL; } |
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// NPTL is always floating stack. BsdThreads could be using floating |
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// stack or fixed stack. |
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static bool is_floating_stack() { return _is_floating_stack; } |
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static void libpthread_init(); |
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static bool libnuma_init(); |
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static void* libnuma_dlsym(void* handle, const char* name); |
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#endif |
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// Minimum stack size a thread can be created with (allowing |
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// the VM to completely create the thread and enter user code) |
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static size_t min_stack_allowed; |
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// Return default stack size or guard size for the specified thread type |
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static size_t default_stack_size(os::ThreadType thr_type); |
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static size_t default_guard_size(os::ThreadType thr_type); |
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#ifndef _ALLBSD_SOURCE |
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static void capture_initial_stack(size_t max_size); |
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// Stack overflow handling |
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static bool manually_expand_stack(JavaThread * t, address addr); |
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static int max_register_window_saves_before_flushing(); |
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#endif |
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// Real-time clock functions |
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static void clock_init(void); |
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#ifndef _ALLBSD_SOURCE |
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// fast POSIX clocks support |
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static void fast_thread_clock_init(void); |
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#endif |
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||
13518
86a9027340fb
7194409: os::javaTimeNanos() shows hot on CPU_CLK_UNHALTED profiles
johnc
parents:
13195
diff
changeset
|
205 |
static inline bool supports_monotonic_clock() { |
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return _clock_gettime != NULL; |
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} |
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static int clock_gettime(clockid_t clock_id, struct timespec *tp) { |
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return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; |
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} |
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#ifndef _ALLBSD_SOURCE |
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static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { |
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return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; |
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} |
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static bool supports_fast_thread_cpu_time() { |
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return _supports_fast_thread_cpu_time; |
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} |
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static jlong fast_thread_cpu_time(clockid_t clockid); |
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#endif |
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// Stack repair handling |
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// none present |
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// BsdThreads work-around for 6292965 |
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static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); |
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// Bsd suspend/resume support - this helper is a shadow of its former |
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// self now that low-level suspension is barely used, and old workarounds |
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// for BsdThreads are no longer needed. |
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class SuspendResume { |
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private: |
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volatile int _suspend_action; |
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// values for suspend_action: |
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#define SR_NONE (0x00) |
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#define SR_SUSPEND (0x01) // suspend request |
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#define SR_CONTINUE (0x02) // resume request |
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volatile jint _state; |
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// values for _state: + SR_NONE |
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#define SR_SUSPENDED (0x20) |
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public: |
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SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; } |
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int suspend_action() const { return _suspend_action; } |
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void set_suspend_action(int x) { _suspend_action = x; } |
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// atomic updates for _state |
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void set_suspended() { |
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jint temp, temp2; |
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do { |
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temp = _state; |
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temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp); |
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} while (temp2 != temp); |
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} |
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void clear_suspended() { |
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jint temp, temp2; |
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do { |
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temp = _state; |
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temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp); |
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} while (temp2 != temp); |
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} |
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bool is_suspended() { return _state & SR_SUSPENDED; } |
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#undef SR_SUSPENDED |
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}; |
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private: |
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typedef int (*sched_getcpu_func_t)(void); |
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typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); |
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typedef int (*numa_max_node_func_t)(void); |
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typedef int (*numa_available_func_t)(void); |
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typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); |
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typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); |
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static sched_getcpu_func_t _sched_getcpu; |
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static numa_node_to_cpus_func_t _numa_node_to_cpus; |
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static numa_max_node_func_t _numa_max_node; |
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static numa_available_func_t _numa_available; |
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static numa_tonode_memory_func_t _numa_tonode_memory; |
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static numa_interleave_memory_func_t _numa_interleave_memory; |
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static unsigned long* _numa_all_nodes; |
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static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } |
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static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } |
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static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } |
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static void set_numa_available(numa_available_func_t func) { _numa_available = func; } |
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static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } |
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static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } |
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static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } |
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public: |
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static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } |
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static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { |
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return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; |
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} |
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static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } |
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static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } |
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static int numa_tonode_memory(void *start, size_t size, int node) { |
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return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; |
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} |
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static void numa_interleave_memory(void *start, size_t size) { |
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if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { |
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_numa_interleave_memory(start, size, _numa_all_nodes); |
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} |
|
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} |
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static int get_node_by_cpu(int cpu_id); |
|
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}; |
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314 |
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13195 | 315 |
class PlatformEvent : public CHeapObj<mtInternal> { |
10565 | 316 |
private: |
317 |
double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line |
|
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volatile int _Event ; |
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volatile int _nParked ; |
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pthread_mutex_t _mutex [1] ; |
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pthread_cond_t _cond [1] ; |
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double PostPad [2] ; |
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Thread * _Assoc ; |
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324 |
||
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public: // TODO-FIXME: make dtor private |
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~PlatformEvent() { guarantee (0, "invariant") ; } |
|
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||
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public: |
|
329 |
PlatformEvent() { |
|
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int status; |
|
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status = pthread_cond_init (_cond, NULL); |
|
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assert_status(status == 0, status, "cond_init"); |
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status = pthread_mutex_init (_mutex, NULL); |
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assert_status(status == 0, status, "mutex_init"); |
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_Event = 0 ; |
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_nParked = 0 ; |
|
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_Assoc = NULL ; |
|
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} |
|
339 |
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340 |
// Use caution with reset() and fired() -- they may require MEMBARs |
|
341 |
void reset() { _Event = 0 ; } |
|
342 |
int fired() { return _Event; } |
|
343 |
void park () ; |
|
344 |
void unpark () ; |
|
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int TryPark () ; |
|
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int park (jlong millis) ; |
|
347 |
void SetAssociation (Thread * a) { _Assoc = a ; } |
|
348 |
} ; |
|
349 |
||
13195 | 350 |
class PlatformParker : public CHeapObj<mtInternal> { |
10565 | 351 |
protected: |
352 |
pthread_mutex_t _mutex [1] ; |
|
353 |
pthread_cond_t _cond [1] ; |
|
354 |
||
355 |
public: // TODO-FIXME: make dtor private |
|
356 |
~PlatformParker() { guarantee (0, "invariant") ; } |
|
357 |
||
358 |
public: |
|
359 |
PlatformParker() { |
|
360 |
int status; |
|
361 |
status = pthread_cond_init (_cond, NULL); |
|
362 |
assert_status(status == 0, status, "cond_init"); |
|
363 |
status = pthread_mutex_init (_mutex, NULL); |
|
364 |
assert_status(status == 0, status, "mutex_init"); |
|
365 |
} |
|
366 |
} ; |
|
367 |
||
368 |
#endif // OS_BSD_VM_OS_BSD_HPP |