154017 2016-02-08 16:21:32 -0800 JSC SamplingProfiler: Use a thread + sleep loop instead of WTF::WorkQueue for taking samples 2016-04-05 20:55:19 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 saam saam benjamin commit-queue fpizlo ggaren gskachkov joepeck keith_miller mark.lam msaboff oliver sukolsak ysuzuki oldest_to_newest 1163055 0 saam 2016-02-08 16:21:32 -0800 This is a cleaner design. We will also take better control of keeping consistent sample times closer to 1ms. 1163075 1 saam 2016-02-08 17:14:12 -0800 We would ask WorkQueue to wake us up in 1ms and regularly be woken up in 1.7ms. We're getting wake up times much closer to what we ask for from just using sleep. There is also less overhead from time when woken up to time when doing work by not using GCD. 1163141 2 270911 saam 2016-02-08 21:49:26 -0800 Created attachment 270911 patch 1163142 3 commit-queue 2016-02-08 21:51:39 -0800 Attachment 270911 did not pass style-queue: ERROR: Source/JavaScriptCore/runtime/SamplingProfiler.cpp:212: This { should be at the end of the previous line [whitespace/braces] [4] Total errors found: 1 in 5 files If any of these errors are false positives, please file a bug against check-webkit-style. 1163234 4 270911 joepeck 2016-02-09 11:10:17 -0800 Comment on attachment 270911 patch View in context: https://bugs.webkit.org/attachment.cgi?id=270911&action=review > Source/JavaScriptCore/runtime/SamplingProfiler.cpp:188 > , m_timingInterval(std::chrono::microseconds(1000)) This could be: std::chrono::milliseconds(1) > Source/JavaScriptCore/runtime/VM.cpp:320 > + RefPtr<Stopwatch> stopwatch = Stopwatch::create(); Might be clearer if this is a Ref<> and not a RefPtr<> since there is only this instance that will be moved. 1179665 5 270911 saam 2016-03-31 16:25:20 -0700 Comment on attachment 270911 patch I'm going to rebase a modern version of this patch. 1180855 6 275672 saam 2016-04-05 09:58:32 -0700 Created attachment 275672 patch 1180882 7 275672 ggaren 2016-04-05 11:08:35 -0700 Comment on attachment 275672 patch View in context: https://bugs.webkit.org/attachment.cgi?id=275672&action=review r=me > Source/JavaScriptCore/ChangeLog:16 > + higher rates, this patch is a performance regression. It's slower because > + we're sampling more frequently. You should state the magnitude here. > Source/JavaScriptCore/runtime/SamplingProfiler.cpp:209 > + ref(); // Matching deref() is timerLoop() when we shut down. > + m_threadIdentifier = createThread(createThreadCallback, this, "jsc.sampling-profiler.thread"); You can avoid manual ref/deref and manual casting, which are anti-patterns, by using the lambda version of createThread: if (m_threadIdentifier) return; RefPtr<SamplingProfiler> profiler = this; createThread("jsc.sampling-profiler.thread", [profiler]() { profiler->timerLoop() }); > Source/JavaScriptCore/runtime/SamplingProfiler.cpp:235 > + std::this_thread::sleep_for(m_timingInterval > stackTraceProcessingTime ? m_timingInterval - stackTraceProcessingTime : m_timingInterval); I think you want m_timingInterval - std::min(m_timingInterval, stackTraceProcessingTime). Otherwise, if sampling takes 0.99ms, you'll delay 0.01ms, but if it takes 1.0ms, you'll delay 1.0ms. Alternatively, you could do 1.0ms unconditionally, based on your argument that execution is paused during (most of) stack processing time. 1181126 8 275672 saam 2016-04-05 19:19:51 -0700 Comment on attachment 275672 patch View in context: https://bugs.webkit.org/attachment.cgi?id=275672&action=review >> Source/JavaScriptCore/ChangeLog:16 >> + we're sampling more frequently. > > You should state the magnitude here. Will do. >> Source/JavaScriptCore/runtime/SamplingProfiler.cpp:209 >> + m_threadIdentifier = createThread(createThreadCallback, this, "jsc.sampling-profiler.thread"); > > You can avoid manual ref/deref and manual casting, which are anti-patterns, by using the lambda version of createThread: > > if (m_threadIdentifier) > return; > > RefPtr<SamplingProfiler> profiler = this; > createThread("jsc.sampling-profiler.thread", [profiler]() { > profiler->timerLoop() > }); This is much nicer. I didn't know we had this API. I've updated to use it. >> Source/JavaScriptCore/runtime/SamplingProfiler.cpp:235 >> + std::this_thread::sleep_for(m_timingInterval > stackTraceProcessingTime ? m_timingInterval - stackTraceProcessingTime : m_timingInterval); > > I think you want m_timingInterval - std::min(m_timingInterval, stackTraceProcessingTime). > > Otherwise, if sampling takes 0.99ms, you'll delay 0.01ms, but if it takes 1.0ms, you'll delay 1.0ms. > > Alternatively, you could do 1.0ms unconditionally, based on your argument that execution is paused during (most of) stack processing time. I'm going with your "m_timingInterval - std::min(m_timingInterval, stackTraceProcessingTime)" 1181128 9 275738 saam 2016-04-05 19:20:54 -0700 Created attachment 275738 patch for landing 1181143 10 275738 commit-queue 2016-04-05 20:55:14 -0700 Comment on attachment 275738 patch for landing Clearing flags on attachment: 275738 Committed r199092: <http://trac.webkit.org/changeset/199092> 1181144 11 commit-queue 2016-04-05 20:55:19 -0700 All reviewed patches have been landed. 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