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src: fix v8::CpuProfiler idle sampling
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Ensure that samples are evenly distributed, which is required for
v8::CpuProfiler users to work correctly (v8-profiler / node-inspector).

PR-URL: #2324
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
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Oleksandr Chekhovskyi authored and bnoordhuis committed Sep 12, 2015
1 parent 68dc69a commit 8e14135
Showing 1 changed file with 9 additions and 4 deletions.
13 changes: 9 additions & 4 deletions src/node.cc
Original file line number Diff line number Diff line change
Expand Up @@ -3567,10 +3567,6 @@ inline void PlatformInit() {
RegisterSignalHandler(SIGINT, SignalExit, true);
RegisterSignalHandler(SIGTERM, SignalExit, true);

// Block SIGPROF signals when sleeping in epoll_wait/kevent/etc. Avoids the
// performance penalty of frequent EINTR wakeups when the profiler is running.
uv_loop_configure(uv_default_loop(), UV_LOOP_BLOCK_SIGNAL, SIGPROF);

// Raise the open file descriptor limit.
struct rlimit lim;
if (getrlimit(RLIMIT_NOFILE, &lim) == 0 && lim.rlim_cur != lim.rlim_max) {
Expand Down Expand Up @@ -3635,6 +3631,15 @@ void Init(int* argc,
}
}

#ifdef __POSIX__
// Block SIGPROF signals when sleeping in epoll_wait/kevent/etc. Avoids the
// performance penalty of frequent EINTR wakeups when the profiler is running.
// Only do this for v8.log profiling, as it breaks v8::CpuProfiler users.
if (v8_is_profiling) {
uv_loop_configure(uv_default_loop(), UV_LOOP_BLOCK_SIGNAL, SIGPROF);
}
#endif

#if defined(NODE_HAVE_I18N_SUPPORT)
if (icu_data_dir == nullptr) {
// if the parameter isn't given, use the env variable.
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