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| -rw-r--r-- | tools/profiler/public/ProfilerState.h | 399 |
1 files changed, 399 insertions, 0 deletions
diff --git a/tools/profiler/public/ProfilerState.h b/tools/profiler/public/ProfilerState.h new file mode 100644 index 0000000000..7a9f3f5c73 --- /dev/null +++ b/tools/profiler/public/ProfilerState.h @@ -0,0 +1,399 @@ +/* -*- 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/. */ + +// This header contains most functions that give information about the Profiler: +// Whether it is active or not, paused, and the selected features. +// It is safe to include unconditionally, but uses of structs and functions must +// be guarded by `#ifdef MOZ_GECKO_PROFILER`. + +#ifndef ProfilerState_h +#define ProfilerState_h + +#include <mozilla/DefineEnum.h> +#include <mozilla/EnumSet.h> +#include "mozilla/ProfilerUtils.h" + +#include <functional> + +//--------------------------------------------------------------------------- +// Profiler features +//--------------------------------------------------------------------------- + +#if defined(__APPLE__) && defined(__aarch64__) +# define POWER_HELP "Sample per process power use" +#elif defined(__APPLE__) && defined(__x86_64__) +# define POWER_HELP \ + "Record the power used by the entire system with each sample." +#elif defined(__linux__) && defined(__x86_64__) +# define POWER_HELP \ + "Record the power used by the entire system with each sample. " \ + "Only available with Intel CPUs and requires setting " \ + "the sysctl kernel.perf_event_paranoid to 0." + +#elif defined(_MSC_VER) +# define POWER_HELP \ + "Record the value of every energy meter available on the system with " \ + "each sample. Only available on Windows 11 with Intel CPUs." +#else +# define POWER_HELP "Not supported on this platform." +#endif + +// Higher-order macro containing all the feature info in one place. Define +// |MACRO| appropriately to extract the relevant parts. Note that the number +// values are used internally only and so can be changed without consequence. +// Any changes to this list should also be applied to the feature list in +// toolkit/components/extensions/schemas/geckoProfiler.json. +// *** Synchronize with lists in BaseProfilerState.h and geckoProfiler.json *** +#define PROFILER_FOR_EACH_FEATURE(MACRO) \ + MACRO(0, "java", Java, "Profile Java code, Android only") \ + \ + MACRO(1, "js", JS, \ + "Get the JS engine to expose the JS stack to the profiler") \ + \ + MACRO(2, "mainthreadio", MainThreadIO, "Add main thread file I/O") \ + \ + MACRO(3, "fileio", FileIO, \ + "Add file I/O from all profiled threads, implies mainthreadio") \ + \ + MACRO(4, "fileioall", FileIOAll, \ + "Add file I/O from all threads, implies fileio") \ + \ + MACRO(5, "nomarkerstacks", NoMarkerStacks, \ + "Markers do not capture stacks, to reduce overhead") \ + \ + MACRO(6, "screenshots", Screenshots, \ + "Take a snapshot of the window on every composition") \ + \ + MACRO(7, "seqstyle", SequentialStyle, \ + "Disable parallel traversal in styling") \ + \ + MACRO(8, "stackwalk", StackWalk, \ + "Walk the C++ stack, not available on all platforms") \ + \ + MACRO(9, "jsallocations", JSAllocations, \ + "Have the JavaScript engine track allocations") \ + \ + MACRO(10, "nostacksampling", NoStackSampling, \ + "Disable all stack sampling: Cancels \"js\", \"stackwalk\" and " \ + "labels") \ + \ + MACRO(11, "nativeallocations", NativeAllocations, \ + "Collect the stacks from a smaller subset of all native " \ + "allocations, biasing towards collecting larger allocations") \ + \ + MACRO(12, "ipcmessages", IPCMessages, \ + "Have the IPC layer track cross-process messages") \ + \ + MACRO(13, "audiocallbacktracing", AudioCallbackTracing, \ + "Audio callback tracing") \ + \ + MACRO(14, "cpu", CPUUtilization, "CPU utilization") \ + \ + MACRO(15, "notimerresolutionchange", NoTimerResolutionChange, \ + "Do not adjust the timer resolution for sampling, so that other " \ + "Firefox timers do not get affected") \ + \ + MACRO(16, "cpuallthreads", CPUAllThreads, \ + "Sample the CPU utilization of all registered threads") \ + \ + MACRO(17, "samplingallthreads", SamplingAllThreads, \ + "Sample the stacks of all registered threads") \ + \ + MACRO(18, "markersallthreads", MarkersAllThreads, \ + "Record markers from all registered threads") \ + \ + MACRO(19, "unregisteredthreads", UnregisteredThreads, \ + "Discover and profile unregistered threads -- beware: expensive!") \ + \ + MACRO(20, "processcpu", ProcessCPU, \ + "Sample the CPU utilization of each process") \ + \ + MACRO(21, "power", Power, POWER_HELP) +// *** Synchronize with lists in BaseProfilerState.h and geckoProfiler.json *** + +struct ProfilerFeature { +#define DECLARE(n_, str_, Name_, desc_) \ + static constexpr uint32_t Name_ = (1u << n_); \ + [[nodiscard]] static constexpr bool Has##Name_(uint32_t aFeatures) { \ + return aFeatures & Name_; \ + } \ + static constexpr void Set##Name_(uint32_t& aFeatures) { \ + aFeatures |= Name_; \ + } \ + static constexpr void Clear##Name_(uint32_t& aFeatures) { \ + aFeatures &= ~Name_; \ + } + + // Define a bitfield constant, a getter, and two setters for each feature. + PROFILER_FOR_EACH_FEATURE(DECLARE) + +#undef DECLARE +}; + +// clang-format off +MOZ_DEFINE_ENUM_CLASS(ProfilingState,( + // A callback will be invoked ... + AlreadyActive, // if the profiler is active when the callback is added. + RemovingCallback, // when the callback is removed. + Started, // after the profiler has started. + Pausing, // before the profiler is paused. + Resumed, // after the profiler has resumed. + GeneratingProfile, // before a profile is created. + Stopping, // before the profiler stops (unless restarting afterward). + ShuttingDown // before the profiler is shut down. +)); +// clang-format on + +[[nodiscard]] inline static const char* ProfilingStateToString( + ProfilingState aProfilingState) { + switch (aProfilingState) { + case ProfilingState::AlreadyActive: + return "Profiler already active"; + case ProfilingState::RemovingCallback: + return "Callback being removed"; + case ProfilingState::Started: + return "Profiler started"; + case ProfilingState::Pausing: + return "Profiler pausing"; + case ProfilingState::Resumed: + return "Profiler resumed"; + case ProfilingState::GeneratingProfile: + return "Generating profile"; + case ProfilingState::Stopping: + return "Profiler stopping"; + case ProfilingState::ShuttingDown: + return "Profiler shutting down"; + default: + MOZ_ASSERT_UNREACHABLE("Unexpected ProfilingState enum value"); + return "?"; + } +} + +using ProfilingStateSet = mozilla::EnumSet<ProfilingState>; + +[[nodiscard]] constexpr ProfilingStateSet AllProfilingStates() { + ProfilingStateSet set; + using Value = std::underlying_type_t<ProfilingState>; + for (Value stateValue = 0; + stateValue <= static_cast<Value>(kHighestProfilingState); ++stateValue) { + set += static_cast<ProfilingState>(stateValue); + } + return set; +} + +// Type of callbacks to be invoked at certain state changes. +// It must NOT call profiler_add/remove_state_change_callback(). +using ProfilingStateChangeCallback = std::function<void(ProfilingState)>; + +#ifndef MOZ_GECKO_PROFILER + +[[nodiscard]] inline bool profiler_is_active() { return false; } +[[nodiscard]] inline bool profiler_is_active_and_unpaused() { return false; } +[[nodiscard]] inline bool profiler_feature_active(uint32_t aFeature) { + return false; +} +[[nodiscard]] inline bool profiler_is_locked_on_current_thread() { + return false; +} +inline void profiler_add_state_change_callback( + ProfilingStateSet aProfilingStateSet, + ProfilingStateChangeCallback&& aCallback, uintptr_t aUniqueIdentifier = 0) { +} +inline void profiler_remove_state_change_callback(uintptr_t aUniqueIdentifier) { +} + +#else // !MOZ_GECKO_PROFILER + +# include "mozilla/Atomics.h" +# include "mozilla/Maybe.h" + +# include <stdint.h> + +namespace mozilla::profiler::detail { + +// RacyFeatures is only defined in this header file so that its methods can +// be inlined into profiler_is_active(). Please do not use anything from the +// detail namespace outside the profiler. + +// Within the profiler's code, the preferred way to check profiler activeness +// and features is via ActivePS(). However, that requires locking gPSMutex. +// There are some hot operations where absolute precision isn't required, so we +// duplicate the activeness/feature state in a lock-free manner in this class. +class RacyFeatures { + public: + static void SetActive(uint32_t aFeatures) { + sActiveAndFeatures = Active | aFeatures; + } + + static void SetInactive() { sActiveAndFeatures = 0; } + + static void SetPaused() { sActiveAndFeatures |= Paused; } + + static void SetUnpaused() { sActiveAndFeatures &= ~Paused; } + + static void SetSamplingPaused() { sActiveAndFeatures |= SamplingPaused; } + + static void SetSamplingUnpaused() { sActiveAndFeatures &= ~SamplingPaused; } + + [[nodiscard]] static mozilla::Maybe<uint32_t> FeaturesIfActive() { + if (uint32_t af = sActiveAndFeatures; af & Active) { + // Active, remove the Active&Paused bits to get all features. + return Some(af & ~(Active | Paused | SamplingPaused)); + } + return Nothing(); + } + + [[nodiscard]] static mozilla::Maybe<uint32_t> FeaturesIfActiveAndUnpaused() { + if (uint32_t af = sActiveAndFeatures; (af & (Active | Paused)) == Active) { + // Active but not fully paused, remove the Active and sampling-paused bits + // to get all features. + return Some(af & ~(Active | SamplingPaused)); + } + return Nothing(); + } + + // This implementation must be kept in sync with `gecko_profiler::is_active` + // in the Profiler Rust API. + [[nodiscard]] static bool IsActive() { + return uint32_t(sActiveAndFeatures) & Active; + } + + [[nodiscard]] static bool IsActiveWithFeature(uint32_t aFeature) { + uint32_t af = sActiveAndFeatures; // copy it first + return (af & Active) && (af & aFeature); + } + + [[nodiscard]] static bool IsActiveWithoutFeature(uint32_t aFeature) { + uint32_t af = sActiveAndFeatures; // copy it first + return (af & Active) && !(af & aFeature); + } + + // True if profiler is active, and not fully paused. + // Note that periodic sampling *could* be paused! + // This implementation must be kept in sync with + // `gecko_profiler::can_accept_markers` in the Profiler Rust API. + [[nodiscard]] static bool IsActiveAndUnpaused() { + uint32_t af = sActiveAndFeatures; // copy it first + return (af & Active) && !(af & Paused); + } + + // True if profiler is active, and sampling is not paused (though generic + // `SetPaused()` or specific `SetSamplingPaused()`). + [[nodiscard]] static bool IsActiveAndSamplingUnpaused() { + uint32_t af = sActiveAndFeatures; // copy it first + return (af & Active) && !(af & (Paused | SamplingPaused)); + } + + private: + static constexpr uint32_t Active = 1u << 31; + static constexpr uint32_t Paused = 1u << 30; + static constexpr uint32_t SamplingPaused = 1u << 29; + +// Ensure Active/Paused don't overlap with any of the feature bits. +# define NO_OVERLAP(n_, str_, Name_, desc_) \ + static_assert(ProfilerFeature::Name_ != SamplingPaused, \ + "bad feature value"); + + PROFILER_FOR_EACH_FEATURE(NO_OVERLAP); + +# undef NO_OVERLAP + + // We combine the active bit with the feature bits so they can be read or + // written in a single atomic operation. Accesses to this atomic are not + // recorded by web replay as they may occur at non-deterministic points. + static mozilla::Atomic<uint32_t, mozilla::MemoryOrdering::Relaxed> + sActiveAndFeatures; +}; + +} // namespace mozilla::profiler::detail + +//--------------------------------------------------------------------------- +// Get information from the profiler +//--------------------------------------------------------------------------- + +// Is the profiler active? Note: the return value of this function can become +// immediately out-of-date. E.g. the profile might be active but then +// profiler_stop() is called immediately afterward. One common and reasonable +// pattern of usage is the following: +// +// if (profiler_is_active()) { +// ExpensiveData expensiveData = CreateExpensiveData(); +// PROFILER_OPERATION(expensiveData); +// } +// +// where PROFILER_OPERATION is a no-op if the profiler is inactive. In this +// case the profiler_is_active() check is just an optimization -- it prevents +// us calling CreateExpensiveData() unnecessarily in most cases, but the +// expensive data will end up being created but not used if another thread +// stops the profiler between the CreateExpensiveData() and PROFILER_OPERATION +// calls. +[[nodiscard]] inline bool profiler_is_active() { + return mozilla::profiler::detail::RacyFeatures::IsActive(); +} + +// Same as profiler_is_active(), but also checks if the profiler is not paused. +[[nodiscard]] inline bool profiler_is_active_and_unpaused() { + return mozilla::profiler::detail::RacyFeatures::IsActiveAndUnpaused(); +} + +// Is the profiler active and paused? Returns false if the profiler is inactive. +[[nodiscard]] bool profiler_is_paused(); + +// Is the profiler active and sampling is paused? Returns false if the profiler +// is inactive. +[[nodiscard]] bool profiler_is_sampling_paused(); + +// Get all the features supported by the profiler that are accepted by +// profiler_start(). The result is the same whether the profiler is active or +// not. +[[nodiscard]] uint32_t profiler_get_available_features(); + +// Returns the full feature set if the profiler is active. +// Note: the return value can become immediately out-of-date, much like the +// return value of profiler_is_active(). +[[nodiscard]] inline mozilla::Maybe<uint32_t> profiler_features_if_active() { + return mozilla::profiler::detail::RacyFeatures::FeaturesIfActive(); +} + +// Returns the full feature set if the profiler is active and unpaused. +// Note: the return value can become immediately out-of-date, much like the +// return value of profiler_is_active(). +[[nodiscard]] inline mozilla::Maybe<uint32_t> +profiler_features_if_active_and_unpaused() { + return mozilla::profiler::detail::RacyFeatures::FeaturesIfActiveAndUnpaused(); +} + +// Check if a profiler feature (specified via the ProfilerFeature type) is +// active. Returns false if the profiler is inactive. Note: the return value +// can become immediately out-of-date, much like the return value of +// profiler_is_active(). +[[nodiscard]] bool profiler_feature_active(uint32_t aFeature); + +// Check if the profiler is active without a feature (specified via the +// ProfilerFeature type). Note: the return value can become immediately +// out-of-date, much like the return value of profiler_is_active(). +[[nodiscard]] bool profiler_active_without_feature(uint32_t aFeature); + +// Returns true if any of the profiler mutexes are currently locked *on the +// current thread*. This may be used by re-entrant code that may call profiler +// functions while the same of a different profiler mutex is locked, which could +// deadlock. +[[nodiscard]] bool profiler_is_locked_on_current_thread(); + +// Install a callback to be invoked at any of the given profiling state changes. +// An optional non-zero identifier may be given, to allow later removal of the +// callback, the caller is responsible for making sure it's really unique (e.g., +// by using a pointer to an object it owns.) +void profiler_add_state_change_callback( + ProfilingStateSet aProfilingStateSet, + ProfilingStateChangeCallback&& aCallback, uintptr_t aUniqueIdentifier = 0); + +// Remove the callback with the given non-zero identifier. +void profiler_remove_state_change_callback(uintptr_t aUniqueIdentifier); + +#endif // MOZ_GECKO_PROFILER + +#endif // ProfilerState_h |