gecko-dev/xpcom/base/nsCycleCollector.h
Mike Hommey 538706caba Bug 1203840 - Trigger dirty pages purge after CC. r=njn,r=smaug,r=mccr8
Jemalloc 4 purges dirty pages regularly during free() when the ratio of dirty
pages compared to active pages is higher than 1 << lg_dirty_mult.  We set
lg_dirty_mult in jemalloc_config to limit RSS usage, but it also has an impact
on performance.

So instead of enforcing a high ratio to force more pages being purged, we keep
jemalloc's default ratio of 8, and force a regular purge of all dirty pages,
after cycle collection.

Keeping jemalloc's default ratio avoids cycle-collection-triggered purge to
have to go through really all dirty pages when there are a lot, in which case
the normal jemalloc purge during free() will already have kicked in. It also
takes care of everything that doesn't run the cycle collector still having
a level of purge, like plugins in the plugin-container.

At the same time, since jemalloc_purge_freed_pages does nothing with jemalloc 4,
repurpose the MEMORY_FREE_PURGED_PAGES_MS telemetry probe to track the time
spent in this cycle-collector-triggered purge.
2015-09-20 17:43:43 +09:00

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/* -*- 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/. */
#ifndef nsCycleCollector_h__
#define nsCycleCollector_h__
class nsICycleCollectorListener;
class nsICycleCollectorLogSink;
class nsISupports;
template<class T> struct already_AddRefed;
#include "nsError.h"
#include "nsID.h"
#include "js/SliceBudget.h"
namespace mozilla {
class CycleCollectedJSRuntime;
} // namespace mozilla
bool nsCycleCollector_init();
void nsCycleCollector_startup();
typedef void (*CC_BeforeUnlinkCallback)(void);
void nsCycleCollector_setBeforeUnlinkCallback(CC_BeforeUnlinkCallback aCB);
typedef void (*CC_ForgetSkippableCallback)(void);
void nsCycleCollector_setForgetSkippableCallback(CC_ForgetSkippableCallback aCB);
void nsCycleCollector_forgetSkippable(bool aRemoveChildlessNodes = false,
bool aAsyncSnowWhiteFreeing = false);
void nsCycleCollector_prepareForGarbageCollection();
// If an incremental cycle collection is in progress, finish it.
void nsCycleCollector_finishAnyCurrentCollection();
void nsCycleCollector_dispatchDeferredDeletion(bool aContinuation = false,
bool aPurge = false);
bool nsCycleCollector_doDeferredDeletion();
already_AddRefed<nsICycleCollectorLogSink> nsCycleCollector_createLogSink();
void nsCycleCollector_collect(nsICycleCollectorListener* aManualListener);
void nsCycleCollector_collectSlice(js::SliceBudget& budget,
bool aPreferShorterSlices = false);
uint32_t nsCycleCollector_suspectedCount();
void nsCycleCollector_shutdown();
// Helpers for interacting with JS
void nsCycleCollector_registerJSRuntime(mozilla::CycleCollectedJSRuntime* aRt);
void nsCycleCollector_forgetJSRuntime();
#define NS_CYCLE_COLLECTOR_LOGGER_CID \
{ 0x58be81b4, 0x39d2, 0x437c, \
{ 0x94, 0xea, 0xae, 0xde, 0x2c, 0x62, 0x08, 0xd3 } }
extern nsresult
nsCycleCollectorLoggerConstructor(nsISupports* aOuter,
const nsIID& aIID,
void** aInstancePtr);
#endif // nsCycleCollector_h__