93 lines
3.3 KiB
C++
93 lines
3.3 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/DataLog.h>
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#include <wtf/Locker.h>
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#include <wtf/ProcessID.h>
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#include <wtf/Spectrum.h>
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#include <wtf/StackTrace.h>
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#include <wtf/StackShot.h>
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#include <wtf/Threading.h>
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#include <wtf/WordLock.h>
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namespace WTF {
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class StackShotProfiler {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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StackShotProfiler(unsigned numFrames, unsigned framesToSkip, unsigned stacksToReport)
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: m_numFrames(numFrames)
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, m_framesToSkip(framesToSkip)
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, m_stacksToReport(stacksToReport)
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{
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Thread::create("StackShotProfiler", [this] () { run(); });
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}
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// NEVER_INLINE so that framesToSkip is predictable.
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NEVER_INLINE void profile()
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{
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Locker locker { m_lock };
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m_profile.add(StackShot(m_numFrames + m_framesToSkip));
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m_totalCount++;
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}
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private:
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NO_RETURN void run()
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{
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for (;;) {
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sleep(1_s);
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Locker locker { m_lock };
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auto list = m_profile.buildList();
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dataLog("\nHottest stacks in ", getCurrentProcessID(), ":\n");
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for (size_t i = list.size(), count = 0; i-- && count < m_stacksToReport; count++) {
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auto& entry = list[i];
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dataLog("\nTop #", count + 1, " stack: ", entry.count * 100 / m_totalCount, "%\n");
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StackTrace trace(entry.key.array() + m_framesToSkip, entry.key.size() - m_framesToSkip);
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dataLog(trace);
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}
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dataLog("\n");
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}
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}
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WordLock m_lock;
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Spectrum<StackShot, double> m_profile;
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double m_totalCount { 0 };
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unsigned m_numFrames;
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unsigned m_framesToSkip;
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unsigned m_stacksToReport;
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};
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#define STACK_SHOT_PROFILE(numFrames, framesToSkip, stacksToReport) do { \
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static StackShotProfiler* stackShotProfiler; \
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static std::once_flag stackShotProfilerOnceFlag; \
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std::call_once(stackShotProfilerOnceFlag, [] { stackShotProfiler = new StackShotProfiler(numFrames, framesToSkip, stacksToReport); }); \
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stackShotProfiler->profile(); \
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} while (false)
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} // namespace WTF
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