mirror of
https://github.com/mozilla/gecko-dev.git
synced 2025-01-07 11:56:51 +00:00
df91a347b4
This introduces a low memory watcher that dispatches an offthread read of /proc/meminfo every 5000/1000ms depending on memory levels, then determines which information to act on. It works like this: - Get a percentage of `MemAvailable` versus `MemTotal`. - If memory drops below 5% availability, we are in a memory pressure scenario - If `MemAvailable` is not large enough to accommodate a content process, we are in a memory pressure scenario - If we are in a memory pressure scenario, notify the observers from the main thread. The value I decided to use to represent a content process was based on observation and should be adjusted if it is not representative of what we consider a "typical" content process. Differential Revision: https://phabricator.services.mozilla.com/D117972
67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; 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/. */
|
|
#include "mozilla/AvailableMemoryWatcherUtils.h"
|
|
|
|
#include <fstream>
|
|
#include <iostream>
|
|
|
|
using namespace mozilla;
|
|
|
|
const char* kMemInfoPath = "/proc/meminfo";
|
|
const char* kTestfilePath = "testdata";
|
|
|
|
// Test that we are reading some value from /proc/meminfo.
|
|
// If the values are nonzero, the test is a success.
|
|
void TestFromProc() {
|
|
MemoryInfo memInfo{0, 0};
|
|
ReadMemoryFile(kMemInfoPath, memInfo);
|
|
MOZ_RELEASE_ASSERT(memInfo.memTotal != 0);
|
|
MOZ_RELEASE_ASSERT(memInfo.memAvailable != 0);
|
|
}
|
|
|
|
// Test a file using expected syntax.
|
|
void TestFromFile() {
|
|
MemoryInfo memInfo{0, 0};
|
|
std::ofstream aFile(kTestfilePath);
|
|
aFile << "MemTotal: 12345 kB\n";
|
|
aFile << "MemFree: 99999 kB\n";
|
|
aFile << "MemAvailable: 54321 kB\n";
|
|
aFile.close();
|
|
|
|
ReadMemoryFile(kTestfilePath, memInfo);
|
|
|
|
MOZ_RELEASE_ASSERT(memInfo.memTotal == 12345);
|
|
MOZ_RELEASE_ASSERT(memInfo.memAvailable == 54321);
|
|
|
|
// remove our dummy file
|
|
remove(kTestfilePath);
|
|
}
|
|
|
|
// Test a file with useless data. Results should be
|
|
// the starting struct with {0,0}.
|
|
void TestInvalidFile() {
|
|
MemoryInfo memInfo{0, 0};
|
|
std::ofstream aFile(kTestfilePath);
|
|
aFile << "foo: 12345 kB\n";
|
|
aFile << "bar";
|
|
aFile.close();
|
|
|
|
ReadMemoryFile(kTestfilePath, memInfo);
|
|
|
|
MOZ_RELEASE_ASSERT(memInfo.memTotal == 0);
|
|
MOZ_RELEASE_ASSERT(memInfo.memAvailable == 0);
|
|
|
|
// remove our dummy file
|
|
remove(kTestfilePath);
|
|
}
|
|
|
|
int main() {
|
|
TestFromProc();
|
|
TestFromFile();
|
|
TestInvalidFile();
|
|
return 0;
|
|
}
|