зеркало из https://github.com/mozilla/pjs.git
627 строки
18 KiB
C++
627 строки
18 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsMemoryCacheDevice.cpp, released
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* February 22, 2001.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Gordon Sheridan, <gordon@netscape.com>
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* Patrick C. Beard <beard@netscape.com>
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* Brian Ryner <bryner@brianryner.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsMemoryCacheDevice.h"
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#include "nsCacheService.h"
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#include "nsICacheService.h"
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#include "nsIStorageStream.h"
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#include "nsICacheVisitor.h"
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#include "nsCRT.h"
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#include "nsCache.h"
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#include "nsReadableUtils.h"
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#include "mozilla/Telemetry.h"
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// The memory cache implements the "LRU-SP" caching algorithm
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// described in "LRU-SP: A Size-Adjusted and Popularity-Aware LRU Replacement
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// Algorithm for Web Caching" by Kai Cheng and Yahiko Kambayashi.
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// We keep kQueueCount LRU queues, which should be about ceil(log2(mHardLimit))
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// The queues hold exponentially increasing ranges of floor(log2((size/nref)))
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// values for entries.
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// Entries larger than 2^(kQueueCount-1) go in the last queue.
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// Entries with no expiration go in the first queue.
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const char *gMemoryDeviceID = "memory";
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nsMemoryCacheDevice::nsMemoryCacheDevice()
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: mInitialized(false),
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mEvictionThreshold(PR_INT32_MAX),
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mHardLimit(4 * 1024 * 1024), // default, if no pref
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mSoftLimit((mHardLimit * 9) / 10), // default, if no pref
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mTotalSize(0),
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mInactiveSize(0),
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mEntryCount(0),
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mMaxEntryCount(0),
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mMaxEntrySize(-1) // -1 means "no limit"
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{
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for (int i=0; i<kQueueCount; ++i)
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PR_INIT_CLIST(&mEvictionList[i]);
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}
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nsMemoryCacheDevice::~nsMemoryCacheDevice()
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{
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Shutdown();
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}
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nsresult
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nsMemoryCacheDevice::Init()
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{
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if (mInitialized) return NS_ERROR_ALREADY_INITIALIZED;
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nsresult rv = mMemCacheEntries.Init();
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mInitialized = NS_SUCCEEDED(rv);
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return rv;
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}
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nsresult
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nsMemoryCacheDevice::Shutdown()
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{
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NS_ASSERTION(mInitialized, "### attempting shutdown while not initialized");
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NS_ENSURE_TRUE(mInitialized, NS_ERROR_NOT_INITIALIZED);
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mMemCacheEntries.Shutdown();
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// evict all entries
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nsCacheEntry * entry, * next;
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for (int i = kQueueCount - 1; i >= 0; --i) {
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entry = (nsCacheEntry *)PR_LIST_HEAD(&mEvictionList[i]);
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while (entry != &mEvictionList[i]) {
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NS_ASSERTION(!entry->IsInUse(), "### shutting down with active entries");
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next = (nsCacheEntry *)PR_NEXT_LINK(entry);
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PR_REMOVE_AND_INIT_LINK(entry);
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// update statistics
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PRInt32 memoryRecovered = (PRInt32)entry->DataSize();
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mTotalSize -= memoryRecovered;
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mInactiveSize -= memoryRecovered;
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--mEntryCount;
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delete entry;
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entry = next;
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}
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}
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/*
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* we're not factoring in changes to meta data yet...
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* NS_ASSERTION(mTotalSize == 0, "### mem cache leaking entries?");
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*/
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NS_ASSERTION(mInactiveSize == 0, "### mem cache leaking entries?");
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NS_ASSERTION(mEntryCount == 0, "### mem cache leaking entries?");
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mInitialized = false;
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return NS_OK;
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}
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const char *
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nsMemoryCacheDevice::GetDeviceID()
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{
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return gMemoryDeviceID;
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}
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nsCacheEntry *
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nsMemoryCacheDevice::FindEntry(nsCString * key, bool *collision)
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{
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mozilla::Telemetry::AutoTimer<mozilla::Telemetry::CACHE_MEMORY_SEARCH> timer;
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nsCacheEntry * entry = mMemCacheEntries.GetEntry(key);
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if (!entry) return nsnull;
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// move entry to the tail of an eviction list
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PR_REMOVE_AND_INIT_LINK(entry);
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PR_APPEND_LINK(entry, &mEvictionList[EvictionList(entry, 0)]);
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mInactiveSize -= entry->DataSize();
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return entry;
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}
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nsresult
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nsMemoryCacheDevice::DeactivateEntry(nsCacheEntry * entry)
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{
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CACHE_LOG_DEBUG(("nsMemoryCacheDevice::DeactivateEntry for entry 0x%p\n",
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entry));
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if (entry->IsDoomed()) {
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#ifdef DEBUG
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// XXX verify we've removed it from mMemCacheEntries & eviction list
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#endif
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delete entry;
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CACHE_LOG_DEBUG(("deleted doomed entry 0x%p\n", entry));
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return NS_OK;
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}
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#ifdef DEBUG
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nsCacheEntry * ourEntry = mMemCacheEntries.GetEntry(entry->Key());
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NS_ASSERTION(ourEntry, "DeactivateEntry called for an entry we don't have!");
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NS_ASSERTION(entry == ourEntry, "entry doesn't match ourEntry");
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if (ourEntry != entry)
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return NS_ERROR_INVALID_POINTER;
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#endif
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mInactiveSize += entry->DataSize();
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EvictEntriesIfNecessary();
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return NS_OK;
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}
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nsresult
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nsMemoryCacheDevice::BindEntry(nsCacheEntry * entry)
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{
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if (!entry->IsDoomed()) {
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NS_ASSERTION(PR_CLIST_IS_EMPTY(entry),"entry is already on a list!");
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// append entry to the eviction list
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PR_APPEND_LINK(entry, &mEvictionList[EvictionList(entry, 0)]);
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// add entry to hashtable of mem cache entries
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nsresult rv = mMemCacheEntries.AddEntry(entry);
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if (NS_FAILED(rv)) {
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PR_REMOVE_AND_INIT_LINK(entry);
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return rv;
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}
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// add size of entry to memory totals
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++mEntryCount;
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if (mMaxEntryCount < mEntryCount) mMaxEntryCount = mEntryCount;
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mTotalSize += entry->DataSize();
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EvictEntriesIfNecessary();
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}
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return NS_OK;
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}
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void
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nsMemoryCacheDevice::DoomEntry(nsCacheEntry * entry)
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{
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#ifdef DEBUG
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// debug code to verify we have entry
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nsCacheEntry * hashEntry = mMemCacheEntries.GetEntry(entry->Key());
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if (!hashEntry) NS_WARNING("no entry for key");
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else if (entry != hashEntry) NS_WARNING("entry != hashEntry");
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#endif
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CACHE_LOG_DEBUG(("Dooming entry 0x%p in memory cache\n", entry));
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EvictEntry(entry, DO_NOT_DELETE_ENTRY);
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}
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nsresult
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nsMemoryCacheDevice::OpenInputStreamForEntry( nsCacheEntry * entry,
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nsCacheAccessMode mode,
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PRUint32 offset,
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nsIInputStream ** result)
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{
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NS_ENSURE_ARG_POINTER(entry);
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NS_ENSURE_ARG_POINTER(result);
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nsCOMPtr<nsIStorageStream> storage;
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nsresult rv;
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nsISupports *data = entry->Data();
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if (data) {
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storage = do_QueryInterface(data, &rv);
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if (NS_FAILED(rv))
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return rv;
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}
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else {
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rv = NS_NewStorageStream(4096, PRUint32(-1), getter_AddRefs(storage));
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if (NS_FAILED(rv))
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return rv;
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entry->SetData(storage);
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}
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return storage->NewInputStream(offset, result);
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}
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nsresult
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nsMemoryCacheDevice::OpenOutputStreamForEntry( nsCacheEntry * entry,
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nsCacheAccessMode mode,
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PRUint32 offset,
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nsIOutputStream ** result)
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{
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NS_ENSURE_ARG_POINTER(entry);
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NS_ENSURE_ARG_POINTER(result);
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nsCOMPtr<nsIStorageStream> storage;
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nsresult rv;
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nsISupports *data = entry->Data();
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if (data) {
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storage = do_QueryInterface(data, &rv);
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if (NS_FAILED(rv))
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return rv;
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}
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else {
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rv = NS_NewStorageStream(4096, PRUint32(-1), getter_AddRefs(storage));
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if (NS_FAILED(rv))
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return rv;
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entry->SetData(storage);
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}
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return storage->GetOutputStream(offset, result);
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}
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nsresult
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nsMemoryCacheDevice::GetFileForEntry( nsCacheEntry * entry,
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nsIFile ** result )
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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bool
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nsMemoryCacheDevice::EntryIsTooBig(PRInt64 entrySize)
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{
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CACHE_LOG_DEBUG(("nsMemoryCacheDevice::EntryIsTooBig "
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"[size=%d max=%d soft=%d]\n",
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entrySize, mMaxEntrySize, mSoftLimit));
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if (mMaxEntrySize == -1)
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return entrySize > mSoftLimit;
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else
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return (entrySize > mSoftLimit || entrySize > mMaxEntrySize);
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}
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size_t
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nsMemoryCacheDevice::TotalSize()
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{
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return mTotalSize;
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}
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nsresult
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nsMemoryCacheDevice::OnDataSizeChange( nsCacheEntry * entry, PRInt32 deltaSize)
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{
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if (entry->IsStreamData()) {
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// we have the right to refuse or pre-evict
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PRUint32 newSize = entry->DataSize() + deltaSize;
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if (EntryIsTooBig(newSize)) {
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#ifdef DEBUG
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nsresult rv =
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#endif
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nsCacheService::DoomEntry(entry);
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NS_ASSERTION(NS_SUCCEEDED(rv),"DoomEntry() failed.");
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return NS_ERROR_ABORT;
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}
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}
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// adjust our totals
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mTotalSize += deltaSize;
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if (!entry->IsDoomed()) {
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// move entry to the tail of the appropriate eviction list
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PR_REMOVE_AND_INIT_LINK(entry);
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PR_APPEND_LINK(entry, &mEvictionList[EvictionList(entry, deltaSize)]);
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}
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EvictEntriesIfNecessary();
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return NS_OK;
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}
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void
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nsMemoryCacheDevice::AdjustMemoryLimits(PRInt32 softLimit, PRInt32 hardLimit)
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{
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mSoftLimit = softLimit;
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mHardLimit = hardLimit;
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// First, evict entries that won't fit into the new cache size.
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EvictEntriesIfNecessary();
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}
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void
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nsMemoryCacheDevice::EvictEntry(nsCacheEntry * entry, bool deleteEntry)
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{
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CACHE_LOG_DEBUG(("Evicting entry 0x%p from memory cache, deleting: %d\n",
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entry, deleteEntry));
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// remove entry from our hashtable
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mMemCacheEntries.RemoveEntry(entry);
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// remove entry from the eviction list
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PR_REMOVE_AND_INIT_LINK(entry);
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// update statistics
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PRInt32 memoryRecovered = (PRInt32)entry->DataSize();
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mTotalSize -= memoryRecovered;
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if (!entry->IsDoomed())
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mInactiveSize -= memoryRecovered;
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--mEntryCount;
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if (deleteEntry) delete entry;
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}
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void
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nsMemoryCacheDevice::EvictEntriesIfNecessary(void)
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{
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nsCacheEntry * entry;
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nsCacheEntry * maxEntry;
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CACHE_LOG_DEBUG(("EvictEntriesIfNecessary. mTotalSize: %d, mHardLimit: %d,"
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"mInactiveSize: %d, mSoftLimit: %d\n",
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mTotalSize, mHardLimit, mInactiveSize, mSoftLimit));
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if ((mTotalSize < mHardLimit) && (mInactiveSize < mSoftLimit))
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return;
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PRUint32 now = SecondsFromPRTime(PR_Now());
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PRUint64 entryCost = 0;
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PRUint64 maxCost = 0;
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do {
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// LRU-SP eviction selection: Check the head of each segment (each
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// eviction list, kept in LRU order) and select the maximal-cost
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// entry for eviction. Cost is time-since-accessed * size / nref.
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maxEntry = 0;
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for (int i = kQueueCount - 1; i >= 0; --i) {
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entry = (nsCacheEntry *)PR_LIST_HEAD(&mEvictionList[i]);
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// If the head of a list is in use, check the next available entry
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while ((entry != &mEvictionList[i]) &&
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(entry->IsInUse())) {
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entry = (nsCacheEntry *)PR_NEXT_LINK(entry);
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}
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if (entry != &mEvictionList[i]) {
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entryCost = (PRUint64)
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(now - entry->LastFetched()) * entry->DataSize() /
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PR_MAX(1, entry->FetchCount());
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if (!maxEntry || (entryCost > maxCost)) {
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maxEntry = entry;
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maxCost = entryCost;
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}
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}
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}
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if (maxEntry) {
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EvictEntry(maxEntry, DELETE_ENTRY);
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} else {
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break;
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}
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}
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while ((mTotalSize >= mHardLimit) || (mInactiveSize >= mSoftLimit));
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}
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int
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nsMemoryCacheDevice::EvictionList(nsCacheEntry * entry, PRInt32 deltaSize)
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{
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// favor items which never expire by putting them in the lowest-index queue
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if (entry->ExpirationTime() == nsICache::NO_EXPIRATION_TIME)
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return 0;
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// compute which eviction queue this entry should go into,
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// based on floor(log2(size/nref))
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PRInt32 size = deltaSize + (PRInt32)entry->DataSize();
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PRInt32 fetchCount = NS_MAX(1, entry->FetchCount());
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return NS_MIN(PR_FloorLog2(size / fetchCount), kQueueCount - 1);
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}
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nsresult
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nsMemoryCacheDevice::Visit(nsICacheVisitor * visitor)
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{
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nsMemoryCacheDeviceInfo * deviceInfo = new nsMemoryCacheDeviceInfo(this);
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nsCOMPtr<nsICacheDeviceInfo> deviceRef(deviceInfo);
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if (!deviceInfo) return NS_ERROR_OUT_OF_MEMORY;
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bool keepGoing;
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nsresult rv = visitor->VisitDevice(gMemoryDeviceID, deviceInfo, &keepGoing);
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if (NS_FAILED(rv)) return rv;
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if (!keepGoing)
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return NS_OK;
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nsCacheEntry * entry;
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nsCOMPtr<nsICacheEntryInfo> entryRef;
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for (int i = kQueueCount - 1; i >= 0; --i) {
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entry = (nsCacheEntry *)PR_LIST_HEAD(&mEvictionList[i]);
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while (entry != &mEvictionList[i]) {
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nsCacheEntryInfo * entryInfo = new nsCacheEntryInfo(entry);
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if (!entryInfo) return NS_ERROR_OUT_OF_MEMORY;
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entryRef = entryInfo;
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rv = visitor->VisitEntry(gMemoryDeviceID, entryInfo, &keepGoing);
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entryInfo->DetachEntry();
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if (NS_FAILED(rv)) return rv;
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if (!keepGoing) break;
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entry = (nsCacheEntry *)PR_NEXT_LINK(entry);
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}
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}
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return NS_OK;
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}
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nsresult
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nsMemoryCacheDevice::EvictEntries(const char * clientID)
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{
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nsCacheEntry * entry;
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PRUint32 prefixLength = (clientID ? strlen(clientID) : 0);
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for (int i = kQueueCount - 1; i >= 0; --i) {
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PRCList * elem = PR_LIST_HEAD(&mEvictionList[i]);
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while (elem != &mEvictionList[i]) {
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entry = (nsCacheEntry *)elem;
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elem = PR_NEXT_LINK(elem);
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const char * key = entry->Key()->get();
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if (clientID && nsCRT::strncmp(clientID, key, prefixLength) != 0)
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continue;
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if (entry->IsInUse()) {
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nsresult rv = nsCacheService::DoomEntry(entry);
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if (NS_FAILED(rv)) {
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CACHE_LOG_WARNING(("memCache->EvictEntries() aborted: rv =%x", rv));
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return rv;
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}
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} else {
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EvictEntry(entry, DELETE_ENTRY);
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}
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}
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}
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return NS_OK;
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}
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// WARNING: SetCapacity can get called before Init()
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void
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nsMemoryCacheDevice::SetCapacity(PRInt32 capacity)
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{
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PRInt32 hardLimit = capacity * 1024; // convert k into bytes
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PRInt32 softLimit = (hardLimit * 9) / 10;
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AdjustMemoryLimits(softLimit, hardLimit);
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}
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void
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nsMemoryCacheDevice::SetMaxEntrySize(PRInt32 maxSizeInKilobytes)
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{
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// Internal unit is bytes. Changing this only takes effect *after* the
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// change and has no consequences for existing cache-entries
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if (maxSizeInKilobytes >= 0)
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mMaxEntrySize = maxSizeInKilobytes * 1024;
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else
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mMaxEntrySize = -1;
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}
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#ifdef DEBUG
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static PLDHashOperator
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CountEntry(PLDHashTable * table, PLDHashEntryHdr * hdr, PRUint32 number, void * arg)
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{
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PRInt32 *entryCount = (PRInt32 *)arg;
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++(*entryCount);
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return PL_DHASH_NEXT;
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}
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void
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nsMemoryCacheDevice::CheckEntryCount()
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{
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if (!mInitialized) return;
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PRInt32 evictionListCount = 0;
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for (int i=0; i<kQueueCount; ++i) {
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PRCList * elem = PR_LIST_HEAD(&mEvictionList[i]);
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while (elem != &mEvictionList[i]) {
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elem = PR_NEXT_LINK(elem);
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++evictionListCount;
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}
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}
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NS_ASSERTION(mEntryCount == evictionListCount, "### mem cache badness");
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PRInt32 entryCount = 0;
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mMemCacheEntries.VisitEntries(CountEntry, &entryCount);
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NS_ASSERTION(mEntryCount == entryCount, "### mem cache badness");
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}
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#endif
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/******************************************************************************
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* nsMemoryCacheDeviceInfo - for implementing about:cache
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*****************************************************************************/
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NS_IMPL_ISUPPORTS1(nsMemoryCacheDeviceInfo, nsICacheDeviceInfo)
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NS_IMETHODIMP
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nsMemoryCacheDeviceInfo::GetDescription(char ** result)
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{
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NS_ENSURE_ARG_POINTER(result);
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*result = NS_strdup("Memory cache device");
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if (!*result) return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemoryCacheDeviceInfo::GetUsageReport(char ** result)
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{
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NS_ENSURE_ARG_POINTER(result);
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nsCString buffer;
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buffer.AssignLiteral(" <tr>\n"
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" <th>Inactive storage:</th>\n"
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" <td>");
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buffer.AppendInt(mDevice->mInactiveSize / 1024);
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buffer.AppendLiteral(" KiB</td>\n"
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" </tr>\n");
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*result = ToNewCString(buffer);
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if (!*result) return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemoryCacheDeviceInfo::GetEntryCount(PRUint32 * result)
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{
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NS_ENSURE_ARG_POINTER(result);
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// XXX compare calculated count vs. mEntryCount
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*result = (PRUint32)mDevice->mEntryCount;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemoryCacheDeviceInfo::GetTotalSize(PRUint32 * result)
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{
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NS_ENSURE_ARG_POINTER(result);
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*result = (PRUint32)mDevice->mTotalSize;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemoryCacheDeviceInfo::GetMaximumSize(PRUint32 * result)
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{
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NS_ENSURE_ARG_POINTER(result);
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*result = (PRUint32)mDevice->mHardLimit;
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return NS_OK;
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}
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