зеркало из https://github.com/mozilla/gecko-dev.git
Bug 827523 (part 3) - DMD: Add --max-frames and --max-records options. r=jlebar.
--HG-- extra : rebase_source : 9840bcfa2d8fc1127a6f367a94e1d8488ae41c6a
This commit is contained in:
Nicholas Nethercote
Родитель
d5ea3d0aef
Коммит
8685a2fb2b
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@ -1,5 +1,5 @@
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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@ -73,13 +73,6 @@ static const malloc_table_t* gMallocTable = nullptr;
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// This enables/disables DMD.
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static bool gIsDMDRunning = false;
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enum Mode {
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Normal, // run normally
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Test, // do some basic correctness tests
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Stress // do some performance stress tests
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};
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static Mode gMode = Normal;
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// This provides infallible allocations (they abort on OOM). We use it for all
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// of DMD's own allocations, which fall into the following three cases.
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// - Direct allocations (the easy case).
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@ -276,11 +269,64 @@ static char gBuf4[kBufLen];
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static const size_t kNoSize = size_t(-1);
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//---------------------------------------------------------------------------
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// Options (Part 1)
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//---------------------------------------------------------------------------
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class Options
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{
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template <typename T>
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struct NumOption
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{
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const T mDefault;
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const T mMax;
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T mActual;
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NumOption(T aDefault, T aMax)
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: mDefault(aDefault), mMax(aMax), mActual(aDefault)
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{}
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};
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enum Mode {
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Normal, // run normally
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Test, // do some basic correctness tests
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Stress // do some performance stress tests
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};
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char* mDMDEnvVar; // a saved copy, for printing during Dump()
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NumOption<size_t> mSampleBelowSize;
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NumOption<uint32_t> mMaxFrames;
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NumOption<uint32_t> mMaxRecords;
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Mode mMode;
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void BadArg(const char* aArg);
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static const char* ValueIfMatch(const char* aArg, const char* aOptionName);
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static bool GetLong(const char* aArg, const char* aOptionName,
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long aMin, long aMax, long* aN);
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public:
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Options(const char* aDMDEnvVar);
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const char* DMDEnvVar() const { return mDMDEnvVar; }
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size_t SampleBelowSize() const { return mSampleBelowSize.mActual; }
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size_t MaxFrames() const { return mMaxFrames.mActual; }
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size_t MaxRecords() const { return mMaxRecords.mActual; }
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void SetSampleBelowSize(size_t aN) { mSampleBelowSize.mActual = aN; }
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bool IsTestMode() const { return mMode == Test; }
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bool IsStressMode() const { return mMode == Stress; }
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};
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static Options *gOptions;
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//---------------------------------------------------------------------------
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// The global lock
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//---------------------------------------------------------------------------
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// MutexBase implements the platform-specific parts of a mutex.
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#ifdef XP_WIN
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class MutexBase
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@ -703,10 +749,14 @@ public:
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class StackTrace
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{
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public:
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static const uint32_t MaxFrames = 24;
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private:
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uint32_t mLength; // The number of PCs.
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void* mPcs[MaxFrames]; // The PCs themselves.
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void* mPcs[MaxFrames]; // The PCs themselves. If --max-frames is less
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// than 24, this array is bigger than necessary,
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// but that case is unusual.
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public:
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StackTrace() : mLength(0) {}
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@ -800,8 +850,8 @@ StackTrace::Get(Thread* aT)
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{
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AutoUnlockState unlock;
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uint32_t skipFrames = 2;
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rv = NS_StackWalk(StackWalkCallback, skipFrames, MaxFrames, &tmp, 0,
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nullptr);
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rv = NS_StackWalk(StackWalkCallback, skipFrames,
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gOptions->MaxFrames(), &tmp, 0, nullptr);
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}
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if (rv == NS_OK) {
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@ -1075,7 +1125,6 @@ GCStackTraces()
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// malloc/free callbacks
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//---------------------------------------------------------------------------
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static size_t gSampleBelowSize = 0;
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static size_t gSmallBlockActualSizeCounter = 0;
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static void
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@ -1091,17 +1140,18 @@ AllocCallback(void* aPtr, size_t aReqSize, Thread* aT)
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AutoBlockIntercepts block(aT);
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size_t actualSize = gMallocTable->malloc_usable_size(aPtr);
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size_t sampleBelowSize = gOptions->SampleBelowSize();
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if (actualSize < gSampleBelowSize) {
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if (actualSize < sampleBelowSize) {
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// If this allocation is smaller than the sample-below size, increment the
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// cumulative counter. Then, if that counter now exceeds the sample size,
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// blame this allocation for gSampleBelowSize bytes. This precludes the
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// blame this allocation for |sampleBelowSize| bytes. This precludes the
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// measurement of slop.
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gSmallBlockActualSizeCounter += actualSize;
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if (gSmallBlockActualSizeCounter >= gSampleBelowSize) {
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gSmallBlockActualSizeCounter -= gSampleBelowSize;
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if (gSmallBlockActualSizeCounter >= sampleBelowSize) {
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gSmallBlockActualSizeCounter -= sampleBelowSize;
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Block b(aPtr, gSampleBelowSize, StackTrace::Get(aT), /* sampled */ true);
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Block b(aPtr, sampleBelowSize, StackTrace::Get(aT), /* sampled */ true);
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(void)gBlockTable->putNew(aPtr, b);
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}
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} else {
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@ -1555,19 +1605,14 @@ FrameRecord::Print(const Writer& aWriter, LocationService* aLocService,
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}
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//---------------------------------------------------------------------------
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// DMD start-up
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// Options (Part 2)
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//---------------------------------------------------------------------------
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static void RunTestMode(FILE* fp);
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static void RunStressMode(FILE* fp);
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static const char* gDMDEnvVar = nullptr;
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// Given an |aOptionName| like "foo", succeed if |aArg| has the form "foo=blah"
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// (where "blah" is non-empty) and return the pointer to "blah". |aArg| can
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// have leading space chars (but not other whitespace).
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static const char*
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OptionValueIfMatch(const char* aArg, const char* aOptionName)
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const char*
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Options::ValueIfMatch(const char* aArg, const char* aOptionName)
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{
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MOZ_ASSERT(!isspace(*aArg)); // any leading whitespace should not remain
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size_t optionLen = strlen(aOptionName);
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@ -1580,11 +1625,11 @@ OptionValueIfMatch(const char* aArg, const char* aOptionName)
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// Extracts a |long| value for an option from an argument. It must be within
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// the range |aMin..aMax| (inclusive).
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static bool
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OptionLong(const char* aArg, const char* aOptionName, long aMin, long aMax,
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long* aN)
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bool
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Options::GetLong(const char* aArg, const char* aOptionName,
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long aMin, long aMax, long* aN)
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{
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if (const char* optionValue = OptionValueIfMatch(aArg, aOptionName)) {
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if (const char* optionValue = ValueIfMatch(aArg, aOptionName)) {
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char* endPtr;
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*aN = strtol(optionValue, &endPtr, /* base */ 10);
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if (!*endPtr && aMin <= *aN && *aN <= aMax &&
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@ -1595,95 +1640,22 @@ OptionLong(const char* aArg, const char* aOptionName, long aMin, long aMax,
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return false;
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}
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static const size_t gMaxSampleBelowSize = 100 * 1000 * 1000; // bytes
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// Default to sampling with a sample-below size that's a prime number close to
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// 4096.
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// The sample-below default is a prime number close to 4096.
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// - Why that size? Because it's *much* faster but only moderately less precise
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// than a size of 1.
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// - Why prime? Because it makes our sampling more random. If we used a size
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// of 4096, for example, then our alloc counter would only take on even
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// values, because jemalloc always rounds up requests sizes. In contrast, a
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// prime size will explore all possible values of the alloc counter.
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//
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// Using a sample-below size ~= 4096 is much faster than using a sample-below
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// size of 1, and it's not much less accurate in practice, so it's a reasonable
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// default.
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//
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// Using a prime sample-below size makes our sampling more random. If we used
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// instead a sample-below size of 4096, for example, then if all our allocation
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// sizes were even (which they likely are, due to how jemalloc rounds up), our
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// alloc counter would take on only even values.
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//
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// In contrast, using a prime sample-below size lets us explore all possible
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// values of the alloc counter.
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static const size_t gDefaultSampleBelowSize = 4093;
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static void
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BadArg(const char* aArg)
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Options::Options(const char* aDMDEnvVar)
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: mDMDEnvVar(InfallibleAllocPolicy::strdup_(aDMDEnvVar)),
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mSampleBelowSize(4093, 100 * 100 * 1000),
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mMaxFrames(StackTrace::MaxFrames, StackTrace::MaxFrames),
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mMaxRecords(1000, 1000000),
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mMode(Normal)
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{
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StatusMsg("\n");
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StatusMsg("Bad entry in the $DMD environment variable: '%s'.\n", aArg);
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StatusMsg("\n");
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StatusMsg("Valid values of $DMD are:\n");
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StatusMsg("- undefined or \"\" or \"0\", which disables DMD, or\n");
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StatusMsg("- \"1\", which enables it with the default options, or\n");
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StatusMsg("- a whitespace-separated list of |--option=val| entries, which\n");
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StatusMsg(" enables it with non-default options.\n");
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StatusMsg("\n");
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StatusMsg("The following options are allowed; defaults are shown in [].\n");
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StatusMsg(" --sample-below=<1..%d> Sample blocks smaller than this [%d]\n"
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" (prime numbers recommended).\n",
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int(gMaxSampleBelowSize), int(gDefaultSampleBelowSize));
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StatusMsg(" --mode=<normal|test|stress> Which mode to run in? [normal]\n");
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StatusMsg("\n");
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exit(1);
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}
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#ifdef XP_MACOSX
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static void
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NopStackWalkCallback(void* aPc, void* aSp, void* aClosure)
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{
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}
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#endif
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// Note that fopen() can allocate.
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static FILE*
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OpenOutputFile(const char* aFilename)
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{
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FILE* fp = fopen(aFilename, "w");
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if (!fp) {
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StatusMsg("can't create %s file: %s\n", aFilename, strerror(errno));
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exit(1);
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}
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return fp;
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}
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// WARNING: this function runs *very* early -- before all static initializers
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// have run. For this reason, non-scalar globals such as gStateLock and
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// gStackTraceTable are allocated dynamically (so we can guarantee their
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// construction in this function) rather than statically.
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static void
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Init(const malloc_table_t* aMallocTable)
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{
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MOZ_ASSERT(!gIsDMDRunning);
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gMallocTable = aMallocTable;
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// Set defaults of things that can be affected by the $DMD env var.
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gMode = Normal;
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gSampleBelowSize = gDefaultSampleBelowSize;
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// DMD is controlled by the |DMD| environment variable.
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// - If it's unset or empty or "0", DMD doesn't run.
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// - Otherwise, the contents dictate DMD's behaviour.
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char* e = getenv("DMD");
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StatusMsg("$DMD = '%s'\n", e);
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if (!e || strcmp(e, "") == 0 || strcmp(e, "0") == 0) {
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StatusMsg("DMD is not enabled\n");
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return;
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}
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// Save it so we can print it in Dump().
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gDMDEnvVar = e = InfallibleAllocPolicy::strdup_(e);
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char* e = mDMDEnvVar;
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if (strcmp(e, "1") != 0) {
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bool isEnd = false;
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while (!isEnd) {
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@ -1706,15 +1678,21 @@ Init(const malloc_table_t* aMallocTable)
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// Handle arg
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long myLong;
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if (OptionLong(arg, "--sample-below", 1, gMaxSampleBelowSize, &myLong)) {
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gSampleBelowSize = myLong;
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if (GetLong(arg, "--sample-below", 1, mSampleBelowSize.mMax, &myLong)) {
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mSampleBelowSize.mActual = myLong;
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} else if (GetLong(arg, "--max-frames", 1, mMaxFrames.mMax, &myLong)) {
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mMaxFrames.mActual = myLong;
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} else if (GetLong(arg, "--max-records", 1, mMaxRecords.mMax, &myLong)) {
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mMaxRecords.mActual = myLong;
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} else if (strcmp(arg, "--mode=normal") == 0) {
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gMode = Normal;
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mMode = Options::Normal;
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} else if (strcmp(arg, "--mode=test") == 0) {
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gMode = Test;
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mMode = Options::Test;
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} else if (strcmp(arg, "--mode=stress") == 0) {
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gMode = Stress;
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mMode = Options::Stress;
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} else if (strcmp(arg, "") == 0) {
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// This can only happen if there is trailing whitespace. Ignore.
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@ -1728,8 +1706,87 @@ Init(const malloc_table_t* aMallocTable)
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*e = replacedChar;
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}
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}
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}
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// Finished parsing $DMD.
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void
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Options::BadArg(const char* aArg)
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{
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StatusMsg("\n");
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StatusMsg("Bad entry in the $DMD environment variable: '%s'.\n", aArg);
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StatusMsg("\n");
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StatusMsg("Valid values of $DMD are:\n");
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StatusMsg("- undefined or \"\" or \"0\", which disables DMD, or\n");
|
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StatusMsg("- \"1\", which enables it with the default options, or\n");
|
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StatusMsg("- a whitespace-separated list of |--option=val| entries, which\n");
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StatusMsg(" enables it with non-default options.\n");
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StatusMsg("\n");
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StatusMsg("The following options are allowed; defaults are shown in [].\n");
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StatusMsg(" --sample-below=<1..%d> Sample blocks smaller than this [%d]\n",
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int(mSampleBelowSize.mMax),
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int(mSampleBelowSize.mDefault));
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StatusMsg(" (prime numbers are recommended)\n");
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StatusMsg(" --max-frames=<1..%d> Max. depth of stack traces [%d]\n",
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int(mMaxFrames.mMax),
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int(mMaxFrames.mDefault));
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StatusMsg(" --max-records=<1..%u> Max. number of records printed [%u]\n",
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mMaxRecords.mMax,
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mMaxRecords.mDefault);
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StatusMsg(" --mode=<normal|test|stress> Mode of operation [normal]\n");
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StatusMsg("\n");
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exit(1);
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}
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//---------------------------------------------------------------------------
|
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// DMD start-up
|
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//---------------------------------------------------------------------------
|
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|
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#ifdef XP_MACOSX
|
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static void
|
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NopStackWalkCallback(void* aPc, void* aSp, void* aClosure)
|
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{
|
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}
|
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#endif
|
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|
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// Note that fopen() can allocate.
|
||||
static FILE*
|
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OpenOutputFile(const char* aFilename)
|
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{
|
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FILE* fp = fopen(aFilename, "w");
|
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if (!fp) {
|
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StatusMsg("can't create %s file: %s\n", aFilename, strerror(errno));
|
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exit(1);
|
||||
}
|
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return fp;
|
||||
}
|
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|
||||
static void RunTestMode(FILE* fp);
|
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static void RunStressMode(FILE* fp);
|
||||
|
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// WARNING: this function runs *very* early -- before all static initializers
|
||||
// have run. For this reason, non-scalar globals such as gStateLock and
|
||||
// gStackTraceTable are allocated dynamically (so we can guarantee their
|
||||
// construction in this function) rather than statically.
|
||||
static void
|
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Init(const malloc_table_t* aMallocTable)
|
||||
{
|
||||
MOZ_ASSERT(!gIsDMDRunning);
|
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|
||||
gMallocTable = aMallocTable;
|
||||
|
||||
// DMD is controlled by the |DMD| environment variable.
|
||||
// - If it's unset or empty or "0", DMD doesn't run.
|
||||
// - Otherwise, the contents dictate DMD's behaviour.
|
||||
|
||||
char* e = getenv("DMD");
|
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StatusMsg("$DMD = '%s'\n", e);
|
||||
|
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if (!e || strcmp(e, "") == 0 || strcmp(e, "0") == 0) {
|
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StatusMsg("DMD is not enabled\n");
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return;
|
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}
|
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|
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// Parse $DMD env var.
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gOptions = InfallibleAllocPolicy::new_<Options>(e);
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|
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StatusMsg("DMD is enabled\n");
|
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|
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|
|
@ -1756,7 +1813,7 @@ Init(const malloc_table_t* aMallocTable)
|
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gBlockTable = InfallibleAllocPolicy::new_<BlockTable>();
|
||||
gBlockTable->init(8192);
|
||||
|
||||
if (gMode == Test) {
|
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if (gOptions->IsTestMode()) {
|
||||
// OpenOutputFile() can allocate. So do this before setting
|
||||
// gIsDMDRunning so those allocations don't show up in our results. Once
|
||||
// gIsDMDRunning is set we are intercepting malloc et al. in earnest.
|
||||
|
|
@ -1770,7 +1827,7 @@ Init(const malloc_table_t* aMallocTable)
|
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exit(0);
|
||||
}
|
||||
|
||||
if (gMode == Stress) {
|
||||
if (gOptions->IsStressMode()) {
|
||||
FILE* fp = OpenOutputFile("stress.dmd");
|
||||
gIsDMDRunning = true;
|
||||
|
||||
|
|
@ -1857,23 +1914,23 @@ PrintSortedRecords(const Writer& aWriter, LocationService* aLocService,
|
|||
return;
|
||||
}
|
||||
|
||||
StatusMsg(" printing %s stack %s record array...\n", astr, kind);
|
||||
size_t cumulativeUsableSize = 0;
|
||||
|
||||
// Limit the number of records printed, because fix-linux-stack.pl is too
|
||||
// damn slow. Note that we don't break out of this loop because we need to
|
||||
// keep adding to |cumulativeUsableSize|.
|
||||
static const uint32_t MaxRecords = 1000;
|
||||
uint32_t numRecords = recordArray.length();
|
||||
|
||||
StatusMsg(" printing %s stack %s record array...\n", astr, kind);
|
||||
size_t cumulativeUsableSize = 0;
|
||||
uint32_t maxRecords = gOptions->MaxRecords();
|
||||
for (uint32_t i = 0; i < numRecords; i++) {
|
||||
const Record* r = recordArray[i];
|
||||
cumulativeUsableSize += r->GetRecordSize().Usable();
|
||||
if (i < MaxRecords) {
|
||||
if (i < maxRecords) {
|
||||
r->Print(aWriter, aLocService, i+1, numRecords, aStr, astr,
|
||||
aCategoryUsableSize, cumulativeUsableSize, aTotalUsableSize);
|
||||
} else if (i == MaxRecords) {
|
||||
} else if (i == maxRecords) {
|
||||
W("%s: stopping after %s stack %s records\n\n", aStr,
|
||||
Show(MaxRecords, gBuf1, kBufLen), kind);
|
||||
Show(maxRecords, gBuf1, kBufLen), kind);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -2060,8 +2117,9 @@ Dump(Writer aWriter)
|
|||
unreportedNumBlocks + onceReportedNumBlocks + twiceReportedNumBlocks;
|
||||
|
||||
WriteTitle("Invocation\n");
|
||||
W("$DMD = '%s'\n", gDMDEnvVar);
|
||||
W("Sample-below size = %lld\n\n", (long long)(gSampleBelowSize));
|
||||
W("$DMD = '%s'\n", gOptions->DMDEnvVar());
|
||||
W("Sample-below size = %lld\n\n",
|
||||
(long long)(gOptions->SampleBelowSize()));
|
||||
|
||||
// Allocate this on the heap instead of the stack because it's fairly large.
|
||||
LocationService* locService = InfallibleAllocPolicy::new_<LocationService>();
|
||||
|
|
@ -2110,7 +2168,7 @@ Dump(Writer aWriter)
|
|||
W("\n");
|
||||
|
||||
// Stats are non-deterministic, so don't show them in test mode.
|
||||
if (gMode != Test) {
|
||||
if (!gOptions->IsTestMode()) {
|
||||
Sizes sizes;
|
||||
SizeOfInternal(&sizes);
|
||||
|
||||
|
|
@ -2221,7 +2279,7 @@ RunTestMode(FILE* fp)
|
|||
Writer writer(FpWrite, fp);
|
||||
|
||||
// The first part of this test requires sampling to be disabled.
|
||||
gSampleBelowSize = 1;
|
||||
gOptions->SetSampleBelowSize(1);
|
||||
|
||||
// 0th Dump. Zero for everything.
|
||||
Dump(writer);
|
||||
|
|
@ -2359,10 +2417,7 @@ RunTestMode(FILE* fp)
|
|||
// Clear all knowledge of existing blocks to give us a clean slate.
|
||||
gBlockTable->clear();
|
||||
|
||||
// Reset the counter just in case |sample-size| was specified in $DMD.
|
||||
// Otherwise the assertions fail.
|
||||
gSmallBlockActualSizeCounter = 0;
|
||||
gSampleBelowSize = 128;
|
||||
gOptions->SetSampleBelowSize(128);
|
||||
|
||||
char* s;
|
||||
|
||||
|
|
@ -2480,7 +2535,7 @@ RunStressMode(FILE* fp)
|
|||
Writer writer(FpWrite, fp);
|
||||
|
||||
// Disable sampling for maximum stress.
|
||||
gSampleBelowSize = 1;
|
||||
gOptions->SetSampleBelowSize(1);
|
||||
|
||||
stress1(); stress1(); stress1(); stress1(); stress1();
|
||||
stress1(); stress1(); stress1(); stress1(); stress1();
|
||||
|
|
|
|||
Загрузка…
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