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deps: backport 9da3ab6 from V8 upstream #3609

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deps: backport 9da3ab6 from V8 upstream #3609

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3 changes: 3 additions & 0 deletions deps/v8/src/flag-definitions.h
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Original file line number Diff line number Diff line change
Expand Up @@ -929,6 +929,9 @@ DEFINE_BOOL(ll_prof, false, "Enable low-level linux profiler.")
DEFINE_BOOL(perf_basic_prof, false,
"Enable perf linux profiler (basic support).")
DEFINE_NEG_IMPLICATION(perf_basic_prof, compact_code_space)
DEFINE_BOOL(perf_basic_prof_only_functions, false,
"Only report function code ranges to perf (i.e. no stubs).")
DEFINE_IMPLICATION(perf_basic_prof_only_functions, perf_basic_prof)
DEFINE_STRING(gc_fake_mmap, "/tmp/__v8_gc__",
"Specify the name of the file for fake gc mmap used in ll_prof")
DEFINE_BOOL(log_internal_timer_events, false, "Time internal events.")
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6 changes: 6 additions & 0 deletions deps/v8/src/log.cc
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Expand Up @@ -290,6 +290,12 @@ void PerfBasicLogger::LogRecordedBuffer(Code* code,
int length) {
DCHECK(code->instruction_start() == code->address() + Code::kHeaderSize);

if (FLAG_perf_basic_prof_only_functions &&
(code->kind() != Code::FUNCTION &&
code->kind() != Code::OPTIMIZED_FUNCTION)) {
return;
}

base::OS::FPrint(perf_output_handle_, "%llx %x %.*s\n",
reinterpret_cast<uint64_t>(code->instruction_start()),
code->instruction_size(), length, name);
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