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Store local copies of flags needed on the background thread

Browse Source 
BUG=none
R=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/639353002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24483 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
jochen@chromium.org 2014-10-09 09:21:46 +00:00
parent f0452e2193
commit c5ee3ae511
2 changed files with 27 additions and 18 deletions
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33
src/optimizing-compiler-thread.cc
View File

@ -82,12 +82,12 @@ void OptimizingCompilerThread::Run() {
DisallowHandleAllocation no_handles;
DisallowHandleDereference no_deref;
if (FLAG_job_based_recompilation) {
if (job_based_recompilation_) {
return;
}
base::ElapsedTimer total_timer;
if (FLAG_trace_concurrent_recompilation) total_timer.Start();
if (tracing_enabled_) total_timer.Start();
while (true) {
input_queue_semaphore_.Wait();
@ -101,7 +101,7 @@ void OptimizingCompilerThread::Run() {
case CONTINUE:
break;
case STOP:
if (FLAG_trace_concurrent_recompilation) {
if (tracing_enabled_) {
time_spent_total_ = total_timer.Elapsed();
}
stop_semaphore_.Signal();
@ -119,11 +119,11 @@ void OptimizingCompilerThread::Run() {
}
base::ElapsedTimer compiling_timer;
if (FLAG_trace_concurrent_recompilation) compiling_timer.Start();
if (tracing_enabled_) compiling_timer.Start();
CompileNext();
if (FLAG_trace_concurrent_recompilation) {
if (tracing_enabled_) {
time_spent_compiling_ += compiling_timer.Elapsed();
}
}
@ -132,7 +132,7 @@ void OptimizingCompilerThread::Run() {
OptimizedCompileJob* OptimizingCompilerThread::NextInput() {
base::LockGuard<base::Mutex> access_input_queue_(&input_queue_mutex_);
DCHECK(!FLAG_job_based_recompilation);
DCHECK(!job_based_recompilation_);
if (input_queue_length_ == 0) return NULL;
OptimizedCompileJob* job = input_queue_[InputQueueIndex(0)];
DCHECK_NE(NULL, job);
@ -181,7 +181,7 @@ static void DisposeOptimizedCompileJob(OptimizedCompileJob* job,
void OptimizingCompilerThread::FlushInputQueue(bool restore_function_code) {
DCHECK(!FLAG_job_based_recompilation);
DCHECK(!job_based_recompilation_);
OptimizedCompileJob* job;
while ((job = NextInput())) {
// This should not block, since we have one signal on the input queue
@ -220,13 +220,13 @@ void OptimizingCompilerThread::Flush() {
DCHECK(!IsOptimizerThread());
base::Release_Store(&stop_thread_, static_cast<base::AtomicWord>(FLUSH));
if (FLAG_block_concurrent_recompilation) Unblock();
if (!FLAG_job_based_recompilation) {
if (!job_based_recompilation_) {
input_queue_semaphore_.Signal();
stop_semaphore_.Wait();
}
FlushOutputQueue(true);
if (FLAG_concurrent_osr) FlushOsrBuffer(true);
if (FLAG_trace_concurrent_recompilation) {
if (tracing_enabled_) {
PrintF(" ** Flushed concurrent recompilation queues.\n");
}
}
@ -236,12 +236,12 @@ void OptimizingCompilerThread::Stop() {
DCHECK(!IsOptimizerThread());
base::Release_Store(&stop_thread_, static_cast<base::AtomicWord>(STOP));
if (FLAG_block_concurrent_recompilation) Unblock();
if (!FLAG_job_based_recompilation) {
if (!job_based_recompilation_) {
input_queue_semaphore_.Signal();
stop_semaphore_.Wait();
}
if (FLAG_job_based_recompilation) {
if (job_based_recompilation_) {
while (true) {
{
base::LockGuard<base::Mutex> access_input_queue(&input_queue_mutex_);
@ -261,13 +261,12 @@ void OptimizingCompilerThread::Stop() {
if (FLAG_concurrent_osr) FlushOsrBuffer(false);
if (FLAG_trace_concurrent_recompilation) {
if (tracing_enabled_) {
double percentage = time_spent_compiling_.PercentOf(time_spent_total_);
PrintF(" ** Compiler thread did %.2f%% useful work\n", percentage);
}
if ((FLAG_trace_osr || FLAG_trace_concurrent_recompilation) &&
FLAG_concurrent_osr) {
if ((FLAG_trace_osr || tracing_enabled_) && FLAG_concurrent_osr) {
PrintF("[COSR hit rate %d / %d]\n", osr_hits_, osr_attempts_);
}
@ -297,7 +296,7 @@ void OptimizingCompilerThread::InstallOptimizedFunctions() {
BackEdgeTable::RemoveStackCheck(code, offset);
} else {
if (function->IsOptimized()) {
if (FLAG_trace_concurrent_recompilation) {
if (tracing_enabled_) {
PrintF(" ** Aborting compilation for ");
function->ShortPrint();
PrintF(" as it has already been optimized.\n");
@ -334,7 +333,7 @@ void OptimizingCompilerThread::QueueForOptimization(OptimizedCompileJob* job) {
input_queue_[InputQueueIndex(input_queue_length_)] = job;
input_queue_length_++;
}
if (FLAG_job_based_recompilation) {
if (job_based_recompilation_) {
V8::GetCurrentPlatform()->CallOnBackgroundThread(
new CompileTask(isolate_, job), v8::Platform::kShortRunningTask);
} else if (FLAG_block_concurrent_recompilation) {
@ -347,7 +346,7 @@ void OptimizingCompilerThread::QueueForOptimization(OptimizedCompileJob* job) {
void OptimizingCompilerThread::Unblock() {
DCHECK(!IsOptimizerThread());
if (FLAG_job_based_recompilation) {
if (job_based_recompilation_) {
return;
}
while (blocked_jobs_ > 0) {

12
src/optimizing-compiler-thread.h
View File

@ -37,7 +37,9 @@ class OptimizingCompilerThread : public base::Thread {
osr_buffer_cursor_(0),
osr_hits_(0),
osr_attempts_(0),
blocked_jobs_(0) {
blocked_jobs_(0),
tracing_enabled_(FLAG_trace_concurrent_recompilation),
job_based_recompilation_(FLAG_job_based_recompilation) {
base::NoBarrier_Store(&stop_thread_,
static_cast<base::AtomicWord>(CONTINUE));
input_queue_ = NewArray<OptimizedCompileJob*>(input_queue_capacity_);
@ -140,6 +142,14 @@ class OptimizingCompilerThread : public base::Thread {
int osr_attempts_;
int blocked_jobs_;
// Copies of FLAG_trace_concurrent_recompilation and
// FLAG_job_based_recompilation that will be used from the background thread.
//
// Since flags might get modified while the background thread is running, it
// is not safe to access them directly.
bool tracing_enabled_;
bool job_based_recompilation_;
};
} } // namespace v8::internal