зеркало из https://github.com/mozilla/gecko-dev.git
439 строки
13 KiB
C++
439 строки
13 KiB
C++
// Copyright (c) 2006-2011 The Chromium Authors. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in
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// the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google, Inc. nor the names of its contributors
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// may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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// SUCH DAMAGE.
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/*
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# vim: sw=2
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*/
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#include <stdio.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <sched.h>
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#ifdef ANDROID
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#include <android/log.h>
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#else
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#define __android_log_print(a, ...)
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#endif
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// Ubuntu Dapper requires memory pages to be marked as
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// executable. Otherwise, OS raises an exception when executing code
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// in that page.
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#include <sys/types.h> // mmap & munmap
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#include <sys/mman.h> // mmap & munmap
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#include <sys/stat.h> // open
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#include <fcntl.h> // open
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#include <unistd.h> // sysconf
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#ifdef __GLIBC__
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#include <execinfo.h> // backtrace, backtrace_symbols
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#endif // def __GLIBC__
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#include <strings.h> // index
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#include <errno.h>
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#include <stdarg.h>
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#include "platform.h"
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#include "GeckoProfilerImpl.h"
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#include "mozilla/Mutex.h"
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#include "ProfileEntry.h"
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#include "nsThreadUtils.h"
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#include "TableTicker.h"
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#include "UnwinderThread2.h"
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#include <string.h>
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#include <stdio.h>
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#include <list>
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#define SIGNAL_SAVE_PROFILE SIGUSR2
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#if defined(__GLIBC__)
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// glibc doesn't implement gettid(2).
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#include <sys/syscall.h>
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pid_t gettid()
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{
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return (pid_t) syscall(SYS_gettid);
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}
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#endif
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#if !defined(ANDROID)
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// Keep track of when any of our threads calls fork(), so we can
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// temporarily disable signal delivery during the fork() call. Not
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// doing so appears to cause a kind of race, in which signals keep
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// getting delivered to the thread doing fork(), which keeps causing
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// it to fail and be restarted; hence forward progress is delayed a
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// great deal. A side effect of this is to permanently disable
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// sampling in the child process. See bug 837390.
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// Unfortunately this is only doable on non-Android, since Bionic
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// doesn't have pthread_atfork.
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// This records the current state at the time we paused it.
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static bool was_paused = false;
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// In the parent, just before the fork, record the pausedness state,
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// and then pause.
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static void paf_prepare(void) {
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if (Sampler::GetActiveSampler()) {
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was_paused = Sampler::GetActiveSampler()->IsPaused();
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Sampler::GetActiveSampler()->SetPaused(true);
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} else {
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was_paused = false;
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}
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}
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// In the parent, just after the fork, return pausedness to the
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// pre-fork state.
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static void paf_parent(void) {
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if (Sampler::GetActiveSampler())
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Sampler::GetActiveSampler()->SetPaused(was_paused);
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}
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// Set up the fork handlers. This is called just once, at the first
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// call to SenderEntry.
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static void* setup_atfork() {
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pthread_atfork(paf_prepare, paf_parent, NULL);
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return NULL;
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}
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#endif /* !defined(ANDROID) */
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#ifdef ANDROID
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#include "android-signal-defs.h"
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#endif
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struct SamplerRegistry {
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static void AddActiveSampler(Sampler *sampler) {
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ASSERT(!SamplerRegistry::sampler);
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SamplerRegistry::sampler = sampler;
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}
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static void RemoveActiveSampler(Sampler *sampler) {
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SamplerRegistry::sampler = NULL;
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}
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static Sampler *sampler;
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};
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Sampler *SamplerRegistry::sampler = NULL;
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static ThreadProfile* sCurrentThreadProfile = NULL;
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static void ProfilerSaveSignalHandler(int signal, siginfo_t* info, void* context) {
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Sampler::GetActiveSampler()->RequestSave();
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}
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#ifdef ANDROID
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#define V8_HOST_ARCH_ARM 1
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#define SYS_gettid __NR_gettid
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#define SYS_tgkill __NR_tgkill
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#else
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#define V8_HOST_ARCH_X64 1
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#endif
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static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
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if (!Sampler::GetActiveSampler())
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return;
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TickSample sample_obj;
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TickSample* sample = &sample_obj;
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sample->context = context;
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#ifdef ENABLE_SPS_LEAF_DATA
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// If profiling, we extract the current pc and sp.
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if (Sampler::GetActiveSampler()->IsProfiling()) {
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// Extracting the sample from the context is extremely machine dependent.
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ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context);
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mcontext_t& mcontext = ucontext->uc_mcontext;
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#if V8_HOST_ARCH_IA32
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sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_EIP]);
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sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_ESP]);
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sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_EBP]);
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#elif V8_HOST_ARCH_X64
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sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_RIP]);
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sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_RSP]);
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sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_RBP]);
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#elif V8_HOST_ARCH_ARM
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// An undefined macro evaluates to 0, so this applies to Android's Bionic also.
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#if !defined(ANDROID) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
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sample->pc = reinterpret_cast<Address>(mcontext.gregs[R15]);
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sample->sp = reinterpret_cast<Address>(mcontext.gregs[R13]);
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sample->fp = reinterpret_cast<Address>(mcontext.gregs[R11]);
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#ifdef ENABLE_ARM_LR_SAVING
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sample->lr = reinterpret_cast<Address>(mcontext.gregs[R14]);
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#endif
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#else
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sample->pc = reinterpret_cast<Address>(mcontext.arm_pc);
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sample->sp = reinterpret_cast<Address>(mcontext.arm_sp);
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sample->fp = reinterpret_cast<Address>(mcontext.arm_fp);
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#ifdef ENABLE_ARM_LR_SAVING
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sample->lr = reinterpret_cast<Address>(mcontext.arm_lr);
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#endif
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#endif
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#elif V8_HOST_ARCH_MIPS
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// Implement this on MIPS.
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UNIMPLEMENTED();
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#endif
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}
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#endif
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sample->threadProfile = sCurrentThreadProfile;
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sample->timestamp = mozilla::TimeStamp::Now();
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Sampler::GetActiveSampler()->Tick(sample);
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sCurrentThreadProfile = NULL;
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}
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int tgkill(pid_t tgid, pid_t tid, int signalno) {
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return syscall(SYS_tgkill, tgid, tid, signalno);
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}
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class PlatformData : public Malloced {
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public:
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PlatformData()
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{}
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};
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/* static */ PlatformData*
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Sampler::AllocPlatformData(int aThreadId)
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{
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return new PlatformData;
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}
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/* static */ void
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Sampler::FreePlatformData(PlatformData* aData)
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{
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delete aData;
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}
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static void* SignalSender(void* arg) {
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# if defined(ANDROID)
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// pthread_atfork isn't available on Android.
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void* initialize_atfork = NULL;
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# else
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// This call is done just once, at the first call to SenderEntry.
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// It returns NULL.
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static void* initialize_atfork = setup_atfork();
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# endif
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int vm_tgid_ = getpid();
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while (SamplerRegistry::sampler->IsActive()) {
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SamplerRegistry::sampler->HandleSaveRequest();
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if (!SamplerRegistry::sampler->IsPaused()) {
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mozilla::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
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std::vector<ThreadInfo*> threads =
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SamplerRegistry::sampler->GetRegisteredThreads();
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for (uint32_t i = 0; i < threads.size(); i++) {
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ThreadInfo* info = threads[i];
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// This will be null if we're not interested in profiling this thread.
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if (!info->Profile())
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continue;
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// We use sCurrentThreadProfile the ThreadProfile for the
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// thread we're profiling to the signal handler
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sCurrentThreadProfile = info->Profile();
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int threadId = info->ThreadId();
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if (tgkill(vm_tgid_, threadId, SIGPROF) != 0) {
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printf_stderr("profiler failed to signal tid=%d\n", threadId);
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#ifdef DEBUG
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abort();
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#endif
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continue;
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}
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// Wait for the signal handler to run before moving on to the next one
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while (sCurrentThreadProfile)
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sched_yield();
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}
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}
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// Convert ms to us and subtract 100 us to compensate delays
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// occuring during signal delivery.
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// TODO measure and confirm this.
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const useconds_t interval =
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SamplerRegistry::sampler->interval() * 1000 - 100;
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//int result = usleep(interval);
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usleep(interval);
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}
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return initialize_atfork; // which is guaranteed to be NULL
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}
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Sampler::Sampler(int interval, bool profiling, int entrySize)
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: interval_(interval),
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profiling_(profiling),
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paused_(false),
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active_(false),
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entrySize_(entrySize) {
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}
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Sampler::~Sampler() {
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ASSERT(!signal_sender_launched_);
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}
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void Sampler::Start() {
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LOG("Sampler started");
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SamplerRegistry::AddActiveSampler(this);
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// Request profiling signals.
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LOG("Request signal");
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struct sigaction sa;
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sa.sa_sigaction = ProfilerSignalHandler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART | SA_SIGINFO;
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if (sigaction(SIGPROF, &sa, &old_sigprof_signal_handler_) != 0) {
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LOG("Error installing signal");
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return;
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}
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// Request save profile signals
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struct sigaction sa2;
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sa2.sa_sigaction = ProfilerSaveSignalHandler;
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sigemptyset(&sa2.sa_mask);
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sa2.sa_flags = SA_RESTART | SA_SIGINFO;
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if (sigaction(SIGNAL_SAVE_PROFILE, &sa2, &old_sigsave_signal_handler_) != 0) {
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LOG("Error installing start signal");
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return;
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}
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LOG("Signal installed");
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signal_handler_installed_ = true;
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// Start a thread that sends SIGPROF signal to VM thread.
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// Sending the signal ourselves instead of relying on itimer provides
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// much better accuracy.
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SetActive(true);
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if (pthread_create(
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&signal_sender_thread_, NULL, SignalSender, NULL) == 0) {
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signal_sender_launched_ = true;
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}
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LOG("Profiler thread started");
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}
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void Sampler::Stop() {
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SetActive(false);
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// Wait for signal sender termination (it will exit after setting
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// active_ to false).
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if (signal_sender_launched_) {
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pthread_join(signal_sender_thread_, NULL);
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signal_sender_launched_ = false;
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}
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SamplerRegistry::RemoveActiveSampler(this);
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// Restore old signal handler
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if (signal_handler_installed_) {
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sigaction(SIGNAL_SAVE_PROFILE, &old_sigsave_signal_handler_, 0);
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sigaction(SIGPROF, &old_sigprof_signal_handler_, 0);
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signal_handler_installed_ = false;
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}
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}
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bool Sampler::RegisterCurrentThread(const char* aName,
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PseudoStack* aPseudoStack,
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bool aIsMainThread, void* stackTop)
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{
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if (!Sampler::sRegisteredThreadsMutex)
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return false;
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mozilla::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
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ThreadInfo* info = new ThreadInfo(aName, gettid(),
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aIsMainThread, aPseudoStack);
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bool profileThread = sActiveSampler &&
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(aIsMainThread || sActiveSampler->ProfileThreads());
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if (profileThread) {
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// We need to create the ThreadProfile now
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info->SetProfile(new ThreadProfile(info->Name(),
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sActiveSampler->EntrySize(),
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info->Stack(),
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info->ThreadId(),
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info->GetPlatformData(),
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aIsMainThread));
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if (sActiveSampler->ProfileJS()) {
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info->Profile()->GetPseudoStack()->enableJSSampling();
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}
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}
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sRegisteredThreads->push_back(info);
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uwt__register_thread_for_profiling(stackTop);
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return true;
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}
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void Sampler::UnregisterCurrentThread()
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{
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if (!Sampler::sRegisteredThreadsMutex)
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return;
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mozilla::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
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int id = gettid();
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for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
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ThreadInfo* info = sRegisteredThreads->at(i);
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if (info->ThreadId() == id) {
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delete info;
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sRegisteredThreads->erase(sRegisteredThreads->begin() + i);
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break;
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}
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}
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uwt__unregister_thread_for_profiling();
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}
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#ifdef ANDROID
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static struct sigaction old_sigstart_signal_handler;
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const int SIGSTART = SIGUSR1;
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static void StartSignalHandler(int signal, siginfo_t* info, void* context) {
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profiler_start(PROFILE_DEFAULT_ENTRY, PROFILE_DEFAULT_INTERVAL,
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PROFILE_DEFAULT_FEATURES, PROFILE_DEFAULT_FEATURE_COUNT);
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}
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void OS::RegisterStartHandler()
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{
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LOG("Registering start signal");
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struct sigaction sa;
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sa.sa_sigaction = StartSignalHandler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART | SA_SIGINFO;
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if (sigaction(SIGSTART, &sa, &old_sigstart_signal_handler) != 0) {
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LOG("Error installing signal");
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}
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}
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#endif
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