mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
025fc12dba
The threads that are frozen/recreated include: * ImageBridgeChildThread. * Image decoding thread pool. * IPC thread (checkpointed, but not frozen). * GC Helper thread. * XPC runtime watchdog thread. * Socket transport service thread/thread pool. * Memory pressure watcher. * Timer thread. * DOM promise worker.
274 lines
8.9 KiB
C++
274 lines
8.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=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 "GonkMemoryPressureMonitoring.h"
|
|
#include "mozilla/FileUtils.h"
|
|
#include "mozilla/Monitor.h"
|
|
#include "mozilla/Preferences.h"
|
|
#include "mozilla/Services.h"
|
|
#include "nsIObserver.h"
|
|
#include "nsIObserverService.h"
|
|
#include "nsMemoryPressure.h"
|
|
#include "nsThreadUtils.h"
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <poll.h>
|
|
#include <android/log.h>
|
|
|
|
#define LOG(args...) \
|
|
__android_log_print(ANDROID_LOG_INFO, "GonkMemoryPressure" , ## args)
|
|
|
|
#ifdef MOZ_NUWA_PROCESS
|
|
#include "ipc/Nuwa.h"
|
|
#endif
|
|
|
|
using namespace mozilla;
|
|
|
|
namespace {
|
|
|
|
/**
|
|
* MemoryPressureWatcher watches sysfs from its own thread to notice when the
|
|
* system is under memory pressure. When we observe memory pressure, we use
|
|
* MemoryPressureRunnable to notify observers that they should release memory.
|
|
*
|
|
* When the system is under memory pressure, we don't want to constantly fire
|
|
* memory-pressure events. So instead, we try to detect when sysfs indicates
|
|
* that we're no longer under memory pressure, and only then start firing events
|
|
* again.
|
|
*
|
|
* (This is a bit problematic because we can't poll() to detect when we're no
|
|
* longer under memory pressure; instead we have to periodically read the sysfs
|
|
* node. If we remain under memory pressure for a long time, this means we'll
|
|
* continue waking up to read from the node for a long time, potentially wasting
|
|
* battery life. Hopefully we don't hit this case in practice! We write to
|
|
* logcat each time we go around this loop so it's at least noticable.)
|
|
*
|
|
* Shutting down safely is a bit of a chore. XPCOM won't shut down until all
|
|
* threads exit, so we need to exit the Run() method below on shutdown. But our
|
|
* thread might be blocked in one of two situations: We might be poll()'ing the
|
|
* sysfs node waiting for memory pressure to occur, or we might be asleep
|
|
* waiting to read() the sysfs node to see if we're no longer under memory
|
|
* pressure.
|
|
*
|
|
* To let us wake up from the poll(), we poll() not just the sysfs node but also
|
|
* a pipe, which we write to on shutdown. To let us wake up from sleeping
|
|
* between read()s, we sleep by Wait()'ing on a monitor, which we notify on
|
|
* shutdown.
|
|
*/
|
|
class MemoryPressureWatcher
|
|
: public nsIRunnable
|
|
, public nsIObserver
|
|
{
|
|
public:
|
|
MemoryPressureWatcher()
|
|
: mMonitor("MemoryPressureWatcher")
|
|
, mShuttingDown(false)
|
|
{
|
|
}
|
|
|
|
NS_DECL_THREADSAFE_ISUPPORTS
|
|
|
|
nsresult Init()
|
|
{
|
|
nsCOMPtr<nsIObserverService> os = services::GetObserverService();
|
|
NS_ENSURE_STATE(os);
|
|
|
|
// The observer service holds us alive.
|
|
os->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, /* holdsWeak */ false);
|
|
|
|
// While we're under memory pressure, we periodically read()
|
|
// notify_trigger_active to try and see when we're no longer under memory
|
|
// pressure. mPollMS indicates how many milliseconds we wait between those
|
|
// read()s.
|
|
mPollMS = Preferences::GetUint("gonk.systemMemoryPressureRecoveryPollMS",
|
|
/* default */ 5000);
|
|
|
|
int pipes[2];
|
|
NS_ENSURE_STATE(!pipe(pipes));
|
|
mShutdownPipeRead = pipes[0];
|
|
mShutdownPipeWrite = pipes[1];
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,
|
|
const PRUnichar* aData)
|
|
{
|
|
MOZ_ASSERT(strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0);
|
|
LOG("Observed XPCOM shutdown.");
|
|
|
|
MonitorAutoLock lock(mMonitor);
|
|
mShuttingDown = true;
|
|
mMonitor.Notify();
|
|
|
|
int rv;
|
|
do {
|
|
// Write something to the pipe; doesn't matter what.
|
|
uint32_t dummy = 0;
|
|
rv = write(mShutdownPipeWrite, &dummy, sizeof(dummy));
|
|
} while(rv == -1 && errno == EINTR);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHOD Run()
|
|
{
|
|
MOZ_ASSERT(!NS_IsMainThread());
|
|
|
|
#ifdef MOZ_NUWA_PROCESS
|
|
if (IsNuwaProcess()) {
|
|
NS_ASSERTION(NuwaMarkCurrentThread != nullptr,
|
|
"NuwaMarkCurrentThread is undefined!");
|
|
NuwaMarkCurrentThread(nullptr, nullptr);
|
|
}
|
|
#endif
|
|
|
|
int lowMemFd = open("/sys/kernel/mm/lowmemkiller/notify_trigger_active",
|
|
O_RDONLY | O_CLOEXEC);
|
|
NS_ENSURE_STATE(lowMemFd != -1);
|
|
ScopedClose autoClose(lowMemFd);
|
|
|
|
nsresult rv = CheckForMemoryPressure(lowMemFd, nullptr);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
while (true) {
|
|
// Wait for a notification on lowMemFd or for data to be written to
|
|
// mShutdownPipeWrite. (poll(lowMemFd, POLLPRI) blocks until we're under
|
|
// memory pressure.)
|
|
struct pollfd pollfds[2];
|
|
pollfds[0].fd = lowMemFd;
|
|
pollfds[0].events = POLLPRI;
|
|
pollfds[1].fd = mShutdownPipeRead;
|
|
pollfds[1].events = POLLIN;
|
|
|
|
int pollRv;
|
|
do {
|
|
pollRv = poll(pollfds, NS_ARRAY_LENGTH(pollfds), /* timeout */ -1);
|
|
} while (pollRv == -1 && errno == EINTR);
|
|
|
|
if (pollfds[1].revents) {
|
|
// Something was written to our shutdown pipe; we're outta here.
|
|
LOG("shutting down (1)");
|
|
return NS_OK;
|
|
}
|
|
|
|
// If pollfds[1] isn't happening, pollfds[0] ought to be!
|
|
if (!(pollfds[0].revents & POLLPRI)) {
|
|
LOG("Unexpected revents value after poll(): %d. "
|
|
"Shutting down GonkMemoryPressureMonitoring.", pollfds[0].revents);
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// POLLPRI on lowMemFd indicates that we're in a low-memory situation. We
|
|
// could read lowMemFd to double-check, but we've observed that the read
|
|
// sometimes completes after the memory-pressure event is over, so let's
|
|
// just believe the result of poll().
|
|
|
|
// We use low-memory-no-forward because each process has its own watcher
|
|
// and thus there is no need for the main process to forward this event.
|
|
rv = NS_DispatchMemoryPressure(MemPressure_New);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
// Manually check lowMemFd until we observe that memory pressure is over.
|
|
// We won't fire any more low-memory events until we observe that
|
|
// we're no longer under pressure. Instead, we fire low-memory-ongoing
|
|
// events, which cause processes to keep flushing caches but will not
|
|
// trigger expensive GCs and other attempts to save memory that are
|
|
// likely futile at this point.
|
|
bool memoryPressure;
|
|
do {
|
|
{
|
|
MonitorAutoLock lock(mMonitor);
|
|
|
|
// We need to check mShuttingDown before we wait here, in order to
|
|
// catch a shutdown signal sent after we poll()'ed mShutdownPipeRead
|
|
// above but before we started waiting on the monitor. But we don't
|
|
// need to check after we wait, because we'll either do another
|
|
// iteration of this inner loop, in which case we'll check
|
|
// mShuttingDown, or we'll exit this loop and do another iteration
|
|
// of the outer loop, in which case we'll check the shutdown pipe.
|
|
if (mShuttingDown) {
|
|
LOG("shutting down (2)");
|
|
return NS_OK;
|
|
}
|
|
mMonitor.Wait(PR_MillisecondsToInterval(mPollMS));
|
|
}
|
|
|
|
LOG("Checking to see if memory pressure is over.");
|
|
rv = CheckForMemoryPressure(lowMemFd, &memoryPressure);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (memoryPressure) {
|
|
rv = NS_DispatchMemoryPressure(MemPressure_Ongoing);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
continue;
|
|
}
|
|
} while (false);
|
|
|
|
LOG("Memory pressure is over.");
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
private:
|
|
/**
|
|
* Read from aLowMemFd, which we assume corresponds to the
|
|
* notify_trigger_active sysfs node, and determine whether we're currently
|
|
* under memory pressure.
|
|
*
|
|
* We don't expect this method to block.
|
|
*/
|
|
nsresult CheckForMemoryPressure(int aLowMemFd, bool* aOut)
|
|
{
|
|
if (aOut) {
|
|
*aOut = false;
|
|
}
|
|
|
|
lseek(aLowMemFd, 0, SEEK_SET);
|
|
|
|
char buf[2];
|
|
int nread;
|
|
do {
|
|
nread = read(aLowMemFd, buf, sizeof(buf));
|
|
} while(nread == -1 && errno == EINTR);
|
|
NS_ENSURE_STATE(nread == 2);
|
|
|
|
// The notify_trigger_active sysfs node should contain either "0\n" or
|
|
// "1\n". The latter indicates memory pressure.
|
|
if (aOut) {
|
|
*aOut = buf[0] == '1' && buf[1] == '\n';
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
Monitor mMonitor;
|
|
uint32_t mPollMS;
|
|
bool mShuttingDown;
|
|
|
|
ScopedClose mShutdownPipeRead;
|
|
ScopedClose mShutdownPipeWrite;
|
|
};
|
|
|
|
NS_IMPL_ISUPPORTS2(MemoryPressureWatcher, nsIRunnable, nsIObserver);
|
|
|
|
} // anonymous namespace
|
|
|
|
namespace mozilla {
|
|
|
|
void
|
|
InitGonkMemoryPressureMonitoring()
|
|
{
|
|
// memoryPressureWatcher is held alive by the observer service.
|
|
nsRefPtr<MemoryPressureWatcher> memoryPressureWatcher =
|
|
new MemoryPressureWatcher();
|
|
NS_ENSURE_SUCCESS_VOID(memoryPressureWatcher->Init());
|
|
|
|
nsCOMPtr<nsIThread> thread;
|
|
NS_NewThread(getter_AddRefs(thread), memoryPressureWatcher);
|
|
}
|
|
|
|
} // namespace mozilla
|