Revision: 16428
Author: [email protected]
Date: Thu Aug 29 13:44:25 2013 UTC
Log: Support higher CPU profiler sampling rate on Windows
This change moves sampling from SamplerThread to the profiler events
processing thread and allows to configure sampling interval on Windows.
Custom tick counter is used instead of OS::Ticks as the latter has maximum
presicion of 1ms while we need 100us. QueryPerformanceCounter is used to
retrieve high-precision time as described in
http://msdn.microsoft.com/en-us/library/ee417693(VS.85).aspx
BUG=v8:2814
[email protected]
Review URL: https://codereview.chromium.org/23271003
http://code.google.com/p/v8/source/detail?r=16428
Modified:
/branches/bleeding_edge/src/sampler.cc
=======================================
--- /branches/bleeding_edge/src/sampler.cc Thu Aug 29 09:58:30 2013 UTC
+++ /branches/bleeding_edge/src/sampler.cc Thu Aug 29 13:44:25 2013 UTC
@@ -609,6 +609,8 @@
bool Sampler::CanSampleOnProfilerEventsProcessorThread() {
#if defined(USE_SIGNALS)
return true;
+#elif V8_OS_WIN || V8_OS_CYGWIN
+ return true;
#else
return false;
#endif
--
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