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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/memory_purger.h"
#include "base/singleton.h"
// static
MemoryPurger* MemoryPurger::GetSingleton() {
return Singleton<MemoryPurger>::get();
}
void MemoryPurger::OnSuspend() {
// TODO:
//
// * For the browser process:
// * Commit all the sqlite databases and unload them from memory; at the
// very least, do this with the history system, then use the prefetch trick to
// reload it on wake.
// * Repeatedly call the V8 idle notification until it returns true
// ("nothing more to free"). Note that it makes more sense to do this than to
// implement a new "delete everything" pass because object references make it
// difficult to free everything possible in just one pass.
// * Dump the backing stores.
// * Destroy the spellcheck object.
// * Tell tcmalloc to free everything it can. (This is vague since it's not
// clear to me what this means; Jim, Mike, and Anton will know more here.
// Also, do we need to do this in each renderer process too?)
//
// * For each renderer process:
// * Repeatedly call the V8 idle notification until it returns true.
// * Tell the WebCore cache manager to set its global limit to 0, which
// should flush the image/script/css/etc. caches.
// * Destroy the WebCore glyph caches.
// * Tell tcmalloc to free everything it can.
//
// Concern: If we tell a bunch of renderer processes to destroy their data,
// they may have to page everything in to do it, which could end up
// overflowing the amount of time we have to work with.
}
void MemoryPurger::OnResume() {
// TODO:
//
// * For the browser process:
// * Reload the history system and any other needed sqlite databases.
//
// * For each renderer process:
// * Reset the WebCore cache manager global limit to the default.
}
MemoryPurger::MemoryPurger() {
base::SystemMonitor::Get()->AddObserver(this);
}
MemoryPurger::~MemoryPurger() {
base::SystemMonitor* system_monitor = base::SystemMonitor::Get();
if (system_monitor)
system_monitor->RemoveObserver(this);
}
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