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[profiler] reduce incorrectly unaccounted ticks.

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No longer invalidate the tick sample if there is no JS frame or only one
non-interpreted JS frame on the stack.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2799603005
Cr-Commit-Position: refs/heads/master@{#44465}
This commit is contained in:
yangguo 2017-04-06 22:00:13 -07:00 committed by Commit bot
parent 12ab9484ee
commit 57bef9a1e2
3 changed files with 47 additions and 6 deletions
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7
src/profiler/tick-sample.cc
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@ -225,12 +225,7 @@ bool TickSample::GetStackSample(Isolate* v8_isolate, RegisterState* regs,
i::SafeStackFrameIterator it(isolate, reinterpret_cast<i::Address>(regs->fp),
reinterpret_cast<i::Address>(regs->sp),
js_entry_sp);
// If at this point iterator does not see any frames,
// is usually means something is wrong with the FP,
// e.g. it is used as a general purpose register in the function.
// Bailout.
if (it.done()) return false;
if (it.done()) return true;
size_t i = 0;
if (record_c_entry_frame == kIncludeCEntryFrame &&

1
test/cctest/cctest.status
View File

@ -117,6 +117,7 @@
['arch == arm64', {
'test-cpu-profiler/CollectDeoptEvents': [PASS, FAIL],
'test-cpu-profiler/CollectOptimizedToplevelProfile': [PASS, FAIL],
'test-api/Bug618': [PASS],

45
test/cctest/test-cpu-profiler.cc
View File

@ -621,6 +621,51 @@ TEST(CollectCpuProfile) {
profile->Delete();
}
static const char* cpu_profiler_toplevel_source =
"for (var i = 0; i < 1E5; i++) {"
" var s = 0;"
" for (var j = 0; j < 1E2; j++) s += i;"
"}";
TEST(CollectOptimizedToplevelProfile) {
LocalContext env;
v8::HandleScope scope(env->GetIsolate());
v8::CpuProfiler* profiler = v8::CpuProfiler::New(env->GetIsolate());
v8::Local<v8::String> profile_name = v8_str("my_profile");
profiler->SetSamplingInterval(100);
profiler->StartProfiling(profile_name, true);
v8::internal::CpuProfiler* iprofiler =
reinterpret_cast<v8::internal::CpuProfiler*>(profiler);
v8::sampler::Sampler* sampler = iprofiler->processor()->sampler();
sampler->StartCountingSamples();
CompileRun(cpu_profiler_toplevel_source);
v8::CpuProfile* profile = profiler->StopProfiling(profile_name);
reinterpret_cast<i::CpuProfile*>(profile)->Print();
const v8::CpuProfileNode* root = profile->GetTopDownRoot();
v8::Local<v8::String> empty = v8::String::Empty(env->GetIsolate());
unsigned toplevel_hitcount = 0;
unsigned unaccounted_hitcount = 0;
for (int i = 0; i < root->GetChildrenCount(); i++) {
const v8::CpuProfileNode* child = root->GetChild(i);
if (empty->Equals(env.local(), child->GetFunctionName()).FromJust()) {
toplevel_hitcount += child->GetHitCount();
} else {
unaccounted_hitcount += child->GetHitCount();
}
}
// Check that we are getting more ticks from the toplevel function than
// unaccounted ticks.
DCHECK(toplevel_hitcount > unaccounted_hitcount);
profile->Delete();
profiler->Dispose();
}
static const char* hot_deopt_no_frame_entry_test_source =
"%NeverOptimizeFunction(foo);\n"
"%NeverOptimizeFunction(start);\n"