Emilio Cobos Álvarez
2223a8bee2
Automatically generated with:
cp dom/.clang-format xpcom/ && mach format xpcom/**.{cpp,h}
Manual changes:
* nsTDependentSubstring.cpp was relying on include order, prevent that
from being changed by clang-format.
* Missing nsAtom.h include from nsGkAtoms.h
* nsWindowsHelpers.h needed to keep the include order
* MemoryPressureLevelMac.h needed mozilla/Attributes.h
Differential Revision: https://phabricator.services.mozilla.com/D311687
105 lines
3.6 KiB
C++
105 lines
3.6 KiB
C++
/* 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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#ifndef mozilla_AvailableMemoryWatcher_h
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#define mozilla_AvailableMemoryWatcher_h
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#include "MemoryPressureLevelMac.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/ipc/CrashReporterHost.h"
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#include "nsCOMPtr.h"
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#include "nsIAvailableMemoryWatcherBase.h"
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#include "nsIObserver.h"
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#include "nsIObserverService.h"
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namespace mozilla {
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#if defined(XP_LINUX) && !defined(ANDROID)
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// PSIInfo struct holds parsed data from /proc/pressure/memory
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//
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// The values in /proc/pressure/memory are floating point numbers, but
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// PSIInfo has integer members (truncated values).
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struct PSIInfo {
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unsigned long some_avg10 = 0;
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unsigned long some_avg60 = 0;
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unsigned long some_avg300 = 0;
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unsigned long some_total = 0;
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unsigned long full_avg10 = 0;
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unsigned long full_avg60 = 0;
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unsigned long full_avg300 = 0;
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unsigned long full_total = 0;
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bool psi_available = false;
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};
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// Get PSI (Pressure Stall Information) data from the last periodic update.
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// This function can be called from any thread and returns the most recently
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// captured PSI values from /proc/pressure/memory.
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// Returns NS_OK if successful, NS_ERROR_FAILURE if PSI is not available
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// or the file format is invalid.
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nsresult GetLastPSISnapshot(PSIInfo& aResult);
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// Start sampling PSI data for non-OOM scenario once
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void StartNonOOMPSISampling();
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#endif
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// This class implements a platform-independent part to watch the system's
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// memory situation and invoke the registered callbacks when we detect
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// a low-memory situation or a high-memory situation.
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// The actual logic to monitor the memory status is implemented in a subclass
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// of nsAvailableMemoryWatcherBase per platform.
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class nsAvailableMemoryWatcherBase : public nsIAvailableMemoryWatcherBase,
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public nsIObserver {
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static StaticRefPtr<nsAvailableMemoryWatcherBase> sSingleton;
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static const char* const kObserverTopics[];
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TimeStamp mLowMemoryStart;
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protected:
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// On Windows the publicly available methods (::Observe() and ::Notify()) are
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// called on the main thread while the ::LowMemoryCallback() method is called
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// by an external thread. All functions called from those must acquire a lock
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// on this mutex before accessing the object's fields to prevent races.
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//
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// On Linux we might tell polling to start/stop from our polling thread
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// or from the main thread during ::Observe().
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Mutex mMutex;
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uint32_t mNumOfTabUnloading MOZ_GUARDED_BY(mMutex);
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uint32_t mNumOfMemoryPressure MOZ_GUARDED_BY(mMutex);
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nsCOMPtr<nsITabUnloader> mTabUnloader;
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nsCOMPtr<nsIObserverService> mObserverSvc;
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// Do not change this value off the main thread.
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bool mInteracting;
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virtual ~nsAvailableMemoryWatcherBase() = default;
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virtual nsresult Init();
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void Shutdown();
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void UpdateLowMemoryTimeStamp();
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void RecordTelemetryEventOnHighMemory(const MutexAutoLock&)
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MOZ_REQUIRES(mMutex);
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public:
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static already_AddRefed<nsAvailableMemoryWatcherBase> GetSingleton();
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nsAvailableMemoryWatcherBase();
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#if defined(XP_DARWIN)
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virtual void OnMemoryPressureChanged(MacMemoryPressureLevel aNewLevel) {};
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virtual void AddChildAnnotations(
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const UniquePtr<ipc::CrashReporterHost>& aCrashReporter) {};
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#endif
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIAVAILABLEMEMORYWATCHERBASE
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NS_DECL_NSIOBSERVER
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};
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// Method to create a platform-specific object
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already_AddRefed<nsAvailableMemoryWatcherBase> CreateAvailableMemoryWatcher();
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} // namespace mozilla
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#endif // ifndef mozilla_AvailableMemoryWatcher_h
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