forked from mirrors/gecko-dev
91ed81b760
I left the implementation in nsMemoryImpl.cpp so that the diff looks reasonable. I also got rid of the weird singleton runnable and replaced it with NS_NewRunnableFunction. Differential Revision: https://phabricator.services.mozilla.com/D158214
131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#include "nsMemory.h"
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#include "nsThreadUtils.h"
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#include "nsIObserver.h"
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#include "nsIObserverService.h"
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#include "nsIRunnable.h"
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#include "nsISimpleEnumerator.h"
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#include "nsCOMPtr.h"
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#include "mozilla/Services.h"
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#include "mozilla/Atomics.h"
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#ifdef ANDROID
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# include <stdio.h>
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// Minimum memory threshold for a device to be considered
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// a low memory platform. This value has be in sync with
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// Java's equivalent threshold, defined in HardwareUtils.java
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# define LOW_MEMORY_THRESHOLD_KB (384 * 1024)
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#endif
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static mozilla::Atomic<bool> sIsFlushing;
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static PRIntervalTime sLastFlushTime = 0;
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// static
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bool nsMemory::IsLowMemoryPlatform() {
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#ifdef ANDROID
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static int sLowMemory =
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-1; // initialize to unknown, lazily evaluate to 0 or 1
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if (sLowMemory == -1) {
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sLowMemory = 0; // assume "not low memory" in case file operations fail
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// check if MemTotal from /proc/meminfo is less than LOW_MEMORY_THRESHOLD_KB
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FILE* fd = fopen("/proc/meminfo", "r");
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if (!fd) {
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return false;
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}
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uint64_t mem = 0;
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int rv = fscanf(fd, "MemTotal: %" PRIu64 " kB", &mem);
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if (fclose(fd)) {
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return false;
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}
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if (rv != 1) {
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return false;
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}
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sLowMemory = (mem < LOW_MEMORY_THRESHOLD_KB) ? 1 : 0;
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}
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return (sLowMemory == 1);
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#else
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return false;
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#endif
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}
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static void RunFlushers(const char16_t* aReason) {
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nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
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if (os) {
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// Instead of:
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// os->NotifyObservers(this, "memory-pressure", aReason);
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// we are going to do this manually to see who/what is
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// deallocating.
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nsCOMPtr<nsISimpleEnumerator> e;
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os->EnumerateObservers("memory-pressure", getter_AddRefs(e));
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if (e) {
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nsCOMPtr<nsIObserver> observer;
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bool loop = true;
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while (NS_SUCCEEDED(e->HasMoreElements(&loop)) && loop) {
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nsCOMPtr<nsISupports> supports;
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e->GetNext(getter_AddRefs(supports));
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if (!supports) {
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continue;
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}
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observer = do_QueryInterface(supports);
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observer->Observe(observer, "memory-pressure", aReason);
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}
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}
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}
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sIsFlushing = false;
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}
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static nsresult FlushMemory(const char16_t* aReason, bool aImmediate) {
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if (aImmediate) {
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// They've asked us to run the flusher *immediately*. We've
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// got to be on the UI main thread for us to be able to do
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// that...are we?
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if (!NS_IsMainThread()) {
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NS_ERROR("can't synchronously flush memory: not on UI thread");
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return NS_ERROR_FAILURE;
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}
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}
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bool lastVal = sIsFlushing.exchange(true);
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if (lastVal) {
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return NS_OK;
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}
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PRIntervalTime now = PR_IntervalNow();
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// Run the flushers immediately if we can; otherwise, proxy to the
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// UI thread and run 'em asynchronously.
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nsresult rv = NS_OK;
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if (aImmediate) {
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RunFlushers(aReason);
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} else {
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// Don't broadcast more than once every 1000ms to avoid being noisy
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if (PR_IntervalToMicroseconds(now - sLastFlushTime) > 1000) {
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nsCOMPtr<nsIRunnable> runnable(NS_NewRunnableFunction(
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"FlushMemory",
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[reason = aReason]() -> void { RunFlushers(reason); }));
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NS_DispatchToMainThread(runnable.forget());
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}
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}
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sLastFlushTime = now;
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return rv;
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}
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nsresult nsMemory::HeapMinimize(bool aImmediate) {
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return FlushMemory(u"heap-minimize", aImmediate);
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}
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