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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef BaseProfilerCounts_h
#define BaseProfilerCounts_h
#ifndef MOZ_GECKO_PROFILER
# define BASE_PROFILER_DEFINE_COUNT_TOTAL(label, category, description)
# define BASE_PROFILER_DEFINE_COUNT(label, category, description)
# define BASE_PROFILER_DEFINE_STATIC_COUNT_TOTAL(label, category, description)
# define AUTO_BASE_PROFILER_COUNT_TOTAL(label, count)
# define AUTO_BASE_PROFILER_COUNT(label)
# define AUTO_BASE_PROFILER_STATIC_COUNT(label, count)
# define AUTO_BASE_PROFILER_FORCE_ALLOCATION(label)
#else
# include "mozilla/Atomics.h"
namespace mozilla {
namespace baseprofiler {
class BaseProfilerCount;
MFBT_API void profiler_add_sampled_counter(BaseProfilerCount* aCounter);
MFBT_API void profiler_remove_sampled_counter(BaseProfilerCount* aCounter);
typedef Atomic<int64_t, MemoryOrdering::Relaxed> ProfilerAtomicSigned;
typedef Atomic<uint64_t, MemoryOrdering::Relaxed> ProfilerAtomicUnsigned;
// Counter support
// There are two types of counters:
// 1) a simple counter which can be added to or subtracted from. This could
// track the number of objects of a type, the number of calls to something
// (reflow, JIT, etc).
// 2) a combined counter which has the above, plus a number-of-calls counter
// that is incremented by 1 for each call to modify the count. This provides
// an optional source for a 'heatmap' of access. This can be used (for
// example) to track the amount of memory allocated, and provide a heatmap of
// memory operations (allocs/frees).
//
// Counters are sampled by the profiler once per sample-period. At this time,
// all counters are global to the process. In the future, there might be more
// versions with per-thread or other discriminators.
//
// Typical usage:
// There are two ways to use counters: With heap-created counter objects,
// or using macros. Note: the macros use statics, and will be slightly
// faster/smaller, and you need to care about creating them before using
// them. They're similar to the use-pattern for the other AUTO_PROFILER*
// macros, but they do need the PROFILER_DEFINE* to be use to instantiate
// the statics.
//
// PROFILER_DEFINE_COUNT(mything, "JIT", "Some JIT byte count")
// ...
// void foo() { ... AUTO_PROFILER_COUNT(mything, number_of_bytes_used); ... }
//
// or (to also get a heatmap)
//
// PROFILER_DEFINE_COUNT_TOTAL(mything, "JIT", "Some JIT byte count")
// ...
// void foo() {
// ...
// AUTO_PROFILER_COUNT_TOTAL(mything, number_of_bytes_generated);
// ...
// }
//
// To use without statics/macros:
//
// UniquePtr<ProfilerCounter> myCounter;
// ...
// myCounter =
// MakeUnique<ProfilerCounter>("mything", "JIT", "Some JIT byte count"));
// ...
// void foo() { ... myCounter->Add(number_of_bytes_generated0; ... }
class BaseProfilerCount {
public:
BaseProfilerCount(const char* aLabel, ProfilerAtomicSigned* aCounter,
ProfilerAtomicUnsigned* aNumber, const char* aCategory,
const char* aDescription)
: mLabel(aLabel),
mCategory(aCategory),
mDescription(aDescription),
mCounter(aCounter),
mNumber(aNumber) {
# define COUNTER_CANARY 0xDEADBEEF
# ifdef DEBUG
mCanary = COUNTER_CANARY;
mPrevNumber = 0;
# endif
// Can't call profiler_* here since this may be non-xul-library
}
# ifdef DEBUG
~BaseProfilerCount() { mCanary = 0; }
# endif
void Sample(int64_t& aCounter, uint64_t& aNumber) {
MOZ_ASSERT(mCanary == COUNTER_CANARY);
aCounter = *mCounter;
aNumber = mNumber ? *mNumber : 0;
# ifdef DEBUG
MOZ_ASSERT(aNumber >= mPrevNumber);
mPrevNumber = aNumber;
# endif
}
// We don't define ++ and Add() here, since the static defines directly
// increment the atomic counters, and the subclasses implement ++ and
// Add() directly.
// These typically are static strings (for example if you use the macros
// below)
const char* mLabel;
const char* mCategory;
const char* mDescription;
// We're ok with these being un-ordered in race conditions. These are
// pointers because we want to be able to use statics and increment them
// directly. Otherwise we could just have them inline, and not need the
// constructor args.
// These can be static globals (using the macros below), though they
// don't have to be - their lifetime must be longer than the use of them
// by the profiler (see profiler_add/remove_sampled_counter()). If you're
// using a lot of these, they probably should be allocated at runtime (see
// class ProfilerCountOnly below).
ProfilerAtomicSigned* mCounter;
ProfilerAtomicUnsigned* mNumber; // may be null
# ifdef DEBUG
uint32_t mCanary;
uint64_t mPrevNumber; // value of number from the last Sample()
# endif
};
// Designed to be allocated dynamically, and simply incremented with obj++
// or obj->Add(n)
class ProfilerCounter final : public BaseProfilerCount {
public:
ProfilerCounter(const char* aLabel, const char* aCategory,
const char* aDescription)
: BaseProfilerCount(aLabel, &mCounter, nullptr, aCategory, aDescription) {
// Assume we're in libxul
profiler_add_sampled_counter(this);
}
virtual ~ProfilerCounter() { profiler_remove_sampled_counter(this); }
BaseProfilerCount& operator++() {
Add(1);
return *this;
}
void Add(int64_t aNumber) { mCounter += aNumber; }
ProfilerAtomicSigned mCounter;
};
// Also keeps a heatmap (number of calls to ++/Add())
class ProfilerCounterTotal final : public BaseProfilerCount {
public:
ProfilerCounterTotal(const char* aLabel, const char* aCategory,
const char* aDescription)
: BaseProfilerCount(aLabel, &mCounter, &mNumber, aCategory,
aDescription) {
// Assume we're in libxul
profiler_add_sampled_counter(this);
}
virtual ~ProfilerCounterTotal() { profiler_remove_sampled_counter(this); }
BaseProfilerCount& operator++() {
Add(1);
return *this;
}
void Add(int64_t aNumber) {
mCounter += aNumber;
mNumber++;
}
ProfilerAtomicSigned mCounter;
ProfilerAtomicUnsigned mNumber;
};
// Defines a counter that is sampled on each profiler tick, with a running
// count (signed), and number-of-instances. Note that because these are two
// independent Atomics, there is a possiblity that count will not include
// the last call, but number of uses will. I think this is not worth
// worrying about
# define BASE_PROFILER_DEFINE_COUNT_TOTAL(label, category, description) \
ProfilerAtomicSigned profiler_count_##label(0); \
ProfilerAtomicUnsigned profiler_number_##label(0); \
const char profiler_category_##label[] = category; \
const char profiler_description_##label[] = description; \
UniquePtr<::mozilla::baseprofiler::BaseProfilerCount> AutoCount_##label;
// This counts, but doesn't keep track of the number of calls to
// AUTO_PROFILER_COUNT()
# define BASE_PROFILER_DEFINE_COUNT(label, category, description) \
ProfilerAtomicSigned profiler_count_##label(0); \
const char profiler_category_##label[] = category; \
const char profiler_description_##label[] = description; \
UniquePtr<::mozilla::baseprofiler::BaseProfilerCount> AutoCount_##label;
// This will create a static initializer if used, but avoids a possible
// allocation.
# define BASE_PROFILER_DEFINE_STATIC_COUNT_TOTAL(label, category, \
description) \
ProfilerAtomicSigned profiler_count_##label(0); \
ProfilerAtomicUnsigned profiler_number_##label(0); \
::mozilla::baseprofiler::BaseProfilerCount AutoCount_##label( \
#label, &profiler_count_##label, &profiler_number_##label, category, \
description);
// If we didn't care about static initializers, we could avoid the need for
// a ptr to the BaseProfilerCount object.
// XXX It would be better to do this without the if() and without the
// theoretical race to set the UniquePtr (i.e. possible leak).
# define AUTO_BASE_PROFILER_COUNT_TOTAL(label, count) \
do { \
profiler_number_##label++; /* do this first*/ \
profiler_count_##label += count; \
if (!AutoCount_##label) { \
/* Ignore that we could call this twice in theory, and that we leak \
* them \
*/ \
AutoCount_##label.reset(new BaseProfilerCount( \
#label, &profiler_count_##label, &profiler_number_##label, \
profiler_category_##label, profiler_description_##label)); \
::mozilla::baseprofiler::profiler_add_sampled_counter( \
AutoCount_##label.get()); \
} \
} while (0)
# define AUTO_BASE_PROFILER_COUNT(label, count) \
do { \
profiler_count_##label += count; /* do this first*/ \
if (!AutoCount_##label) { \
/* Ignore that we could call this twice in theory, and that we leak \
* them \
*/ \
AutoCount_##label.reset(new BaseProfilerCount( \
#label, nullptr, &profiler_number_##label, \
profiler_category_##label, profiler_description_##label)); \
::mozilla::baseprofiler::profiler_add_sampled_counter( \
AutoCount_##label.get()); \
} \
} while (0)
# define AUTO_BASE_PROFILER_STATIC_COUNT(label, count) \
do { \
profiler_number_##label++; /* do this first*/ \
profiler_count_##label += count; \
} while (0)
// if we need to force the allocation
# define AUTO_BASE_PROFILER_FORCE_ALLOCATION(label) \
do { \
if (!AutoCount_##label) { \
/* Ignore that we could call this twice in theory, and that we leak \
* them \
*/ \
AutoCount_##label.reset( \
new ::mozilla::baseprofiler::BaseProfilerCount( \
#label, &profiler_count_##label, &profiler_number_##label, \
profiler_category_##label, profiler_description_##label)); \
} \
} while (0)
} // namespace baseprofiler
} // namespace mozilla
#endif // !MOZ_GECKO_PROFILER
#endif // BaseProfilerCounts_h