forked from mirrors/gecko-dev
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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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#include "PHCManager.h"
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#include "PHC.h"
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#include "mozilla/Literals.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/StaticPrefs_memory.h"
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#include "mozilla/Telemetry.h"
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#include "prsystem.h"
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namespace mozilla {
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using namespace phc;
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static const char kPHCEnabledPref[] = "memory.phc.enabled";
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static const char kPHCMinRamMBPref[] = "memory.phc.min_ram_mb";
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// True if PHC has ever been enabled for this process.
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static bool sWasPHCEnabled = false;
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static void UpdatePHCState() {
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size_t mem_size = PR_GetPhysicalMemorySize() / (1_MiB);
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size_t min_mem_size = StaticPrefs::memory_phc_min_ram_mb();
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// Only enable PHC if there are at least 8GB of ram. Note that we use
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// 1000 bytes per kilobyte rather than 1024. Some 8GB machines will have
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// slightly lower actual RAM available after some hardware devices
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// reserve some.
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if (StaticPrefs::memory_phc_enabled() && mem_size >= min_mem_size) {
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SetPHCState(Enabled);
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sWasPHCEnabled = true;
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} else {
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SetPHCState(OnlyFree);
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}
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}
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static void PrefChangeCallback(const char* aPrefName, void* aNull) {
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MOZ_ASSERT((0 == strcmp(aPrefName, kPHCEnabledPref)) ||
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(0 == strcmp(aPrefName, kPHCMinRamMBPref)));
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UpdatePHCState();
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}
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void InitPHCState() {
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Preferences::RegisterCallback(PrefChangeCallback, kPHCEnabledPref);
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Preferences::RegisterCallback(PrefChangeCallback, kPHCMinRamMBPref);
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UpdatePHCState();
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}
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void ReportPHCTelemetry() {
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if (!sWasPHCEnabled) {
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return;
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}
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MemoryUsage usage;
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PHCMemoryUsage(usage);
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Accumulate(Telemetry::MEMORY_PHC_SLOP, usage.mFragmentationBytes);
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PHCStats stats;
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GetPHCStats(stats);
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Accumulate(Telemetry::MEMORY_PHC_SLOTS_ALLOCATED, stats.mSlotsAllocated);
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Accumulate(Telemetry::MEMORY_PHC_SLOTS_FREED, stats.mSlotsFreed);
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// There are also slots that are unused (neither free nor allocated) they
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// can be calculated by knowing the total number of slots.
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}
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}; // namespace mozilla
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