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