зеркало из https://github.com/mozilla/gecko-dev.git
618 строки
17 KiB
C++
618 строки
17 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim: set ts=8 sts=4 et sw=4 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsCache.h"
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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 "nsICacheVisitor.h"
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#include "nsIStorageStream.h"
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#include "nsCRT.h"
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#include "nsReadableUtils.h"
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#include "mozilla/MathAlgorithms.h"
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#include "mozilla/Telemetry.h"
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#include <algorithm>
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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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using namespace mozilla;
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nsMemoryCacheDevice::nsMemoryCacheDevice()
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: mInitialized(false),
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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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mMemCacheEntries.Init();
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mInitialized = true;
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return NS_OK;
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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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int32_t memoryRecovered = (int32_t)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_2> timer;
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nsCacheEntry * entry = mMemCacheEntries.GetEntry(key);
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if (!entry) return nullptr;
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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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uint32_t 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, uint32_t(-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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uint32_t 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, uint32_t(-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(int64_t 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, int32_t 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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uint32_t 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(int32_t softLimit, int32_t 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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int32_t memoryRecovered = (int32_t)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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uint32_t now = SecondsFromPRTime(PR_Now());
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uint64_t entryCost = 0;
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uint64_t 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 = (uint64_t)
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(now - entry->LastFetched()) * entry->DataSize() /
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std::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, int32_t 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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int32_t size = deltaSize + (int32_t)entry->DataSize();
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int32_t fetchCount = std::max(1, entry->FetchCount());
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return std::min((int)mozilla::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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static bool
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IsEntryPrivate(nsCacheEntry* entry, void* args)
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{
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return entry->IsPrivate();
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}
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struct ClientIDArgs {
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const char* clientID;
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uint32_t prefixLength;
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};
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static bool
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EntryMatchesClientID(nsCacheEntry* entry, void* args)
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{
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const char * clientID = static_cast<ClientIDArgs*>(args)->clientID;
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uint32_t prefixLength = static_cast<ClientIDArgs*>(args)->prefixLength;
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const char * key = entry->Key()->get();
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return !clientID || nsCRT::strncmp(clientID, key, prefixLength) == 0;
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}
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nsresult
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nsMemoryCacheDevice::DoEvictEntries(bool (*matchFn)(nsCacheEntry* entry, void* args), void* args)
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{
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nsCacheEntry * entry;
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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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if (!matchFn(entry, args))
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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->DoEvictEntries() 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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nsresult
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nsMemoryCacheDevice::EvictEntries(const char * clientID)
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{
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ClientIDArgs args = {clientID, clientID ? uint32_t(strlen(clientID)) : 0};
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return DoEvictEntries(&EntryMatchesClientID, &args);
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}
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nsresult
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nsMemoryCacheDevice::EvictPrivateEntries()
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{
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return DoEvictEntries(&IsEntryPrivate, nullptr);
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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(int32_t capacity)
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{
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int32_t hardLimit = capacity * 1024; // convert k into bytes
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int32_t 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(int32_t 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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void
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nsMemoryCacheDevice::CheckEntryCount()
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{
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if (!mInitialized) return;
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int32_t 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);
|
|
++evictionListCount;
|
|
}
|
|
}
|
|
NS_ASSERTION(mEntryCount == evictionListCount, "### mem cache badness");
|
|
|
|
int32_t entryCount = 0;
|
|
for (auto iter = mMemCacheEntries.Iter(); !iter.Done(); iter.Next()) {
|
|
++entryCount;
|
|
}
|
|
NS_ASSERTION(mEntryCount == entryCount, "### mem cache badness");
|
|
}
|
|
#endif
|
|
|
|
/******************************************************************************
|
|
* nsMemoryCacheDeviceInfo - for implementing about:cache
|
|
*****************************************************************************/
|
|
|
|
|
|
NS_IMPL_ISUPPORTS(nsMemoryCacheDeviceInfo, nsICacheDeviceInfo)
|
|
|
|
|
|
NS_IMETHODIMP
|
|
nsMemoryCacheDeviceInfo::GetDescription(char ** result)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(result);
|
|
*result = NS_strdup("Memory cache device");
|
|
if (!*result) return NS_ERROR_OUT_OF_MEMORY;
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
nsMemoryCacheDeviceInfo::GetUsageReport(char ** result)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(result);
|
|
nsCString buffer;
|
|
|
|
buffer.AssignLiteral(" <tr>\n"
|
|
" <th>Inactive storage:</th>\n"
|
|
" <td>");
|
|
buffer.AppendInt(mDevice->mInactiveSize / 1024);
|
|
buffer.AppendLiteral(" KiB</td>\n"
|
|
" </tr>\n");
|
|
|
|
*result = ToNewCString(buffer);
|
|
if (!*result) return NS_ERROR_OUT_OF_MEMORY;
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
nsMemoryCacheDeviceInfo::GetEntryCount(uint32_t * result)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(result);
|
|
// XXX compare calculated count vs. mEntryCount
|
|
*result = (uint32_t)mDevice->mEntryCount;
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
nsMemoryCacheDeviceInfo::GetTotalSize(uint32_t * result)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(result);
|
|
*result = (uint32_t)mDevice->mTotalSize;
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
nsMemoryCacheDeviceInfo::GetMaximumSize(uint32_t * result)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(result);
|
|
*result = (uint32_t)mDevice->mHardLimit;
|
|
return NS_OK;
|
|
}
|