mirror of https://github.com/facebook/rocksdb.git
118 lines
3.6 KiB
C++
118 lines
3.6 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "util/sharded_cache.h"
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#include "util/mutexlock.h"
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namespace rocksdb {
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ShardedCache::ShardedCache(size_t capacity, int num_shard_bits,
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bool strict_capacity_limit)
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: num_shard_bits_(num_shard_bits),
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capacity_(capacity),
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strict_capacity_limit_(strict_capacity_limit),
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last_id_(1) {}
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void ShardedCache::SetCapacity(size_t capacity) {
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int num_shards = 1 << num_shard_bits_;
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const size_t per_shard = (capacity + (num_shards - 1)) / num_shards;
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MutexLock l(&capacity_mutex_);
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for (int s = 0; s < num_shards; s++) {
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GetShard(s)->SetCapacity(per_shard);
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}
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capacity_ = capacity;
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}
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void ShardedCache::SetStrictCapacityLimit(bool strict_capacity_limit) {
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int num_shards = 1 << num_shard_bits_;
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MutexLock l(&capacity_mutex_);
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for (int s = 0; s < num_shards; s++) {
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GetShard(s)->SetStrictCapacityLimit(strict_capacity_limit);
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}
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strict_capacity_limit_ = strict_capacity_limit;
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}
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Status ShardedCache::Insert(const Slice& key, void* value, size_t charge,
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void (*deleter)(const Slice& key, void* value),
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Handle** handle, Priority priority) {
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uint32_t hash = HashSlice(key);
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return GetShard(Shard(hash))
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->Insert(key, hash, value, charge, deleter, handle, priority);
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}
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Cache::Handle* ShardedCache::Lookup(const Slice& key, Statistics* stats) {
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uint32_t hash = HashSlice(key);
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return GetShard(Shard(hash))->Lookup(key, hash);
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}
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void ShardedCache::Release(Handle* handle) {
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uint32_t hash = GetHash(handle);
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GetShard(Shard(hash))->Release(handle);
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}
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void ShardedCache::Erase(const Slice& key) {
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uint32_t hash = HashSlice(key);
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GetShard(Shard(hash))->Erase(key, hash);
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}
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uint64_t ShardedCache::NewId() {
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return last_id_.fetch_add(1, std::memory_order_relaxed);
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}
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size_t ShardedCache::GetCapacity() const {
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MutexLock l(&capacity_mutex_);
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return capacity_;
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}
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bool ShardedCache::HasStrictCapacityLimit() const {
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MutexLock l(&capacity_mutex_);
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return strict_capacity_limit_;
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}
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size_t ShardedCache::GetUsage() const {
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// We will not lock the cache when getting the usage from shards.
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int num_shards = 1 << num_shard_bits_;
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size_t usage = 0;
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for (int s = 0; s < num_shards; s++) {
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usage += GetShard(s)->GetUsage();
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}
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return usage;
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}
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size_t ShardedCache::GetUsage(Handle* handle) const {
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return GetCharge(handle);
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}
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size_t ShardedCache::GetPinnedUsage() const {
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// We will not lock the cache when getting the usage from shards.
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int num_shards = 1 << num_shard_bits_;
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size_t usage = 0;
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for (int s = 0; s < num_shards; s++) {
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usage += GetShard(s)->GetPinnedUsage();
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}
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return usage;
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}
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void ShardedCache::ApplyToAllCacheEntries(void (*callback)(void*, size_t),
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bool thread_safe) {
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int num_shards = 1 << num_shard_bits_;
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for (int s = 0; s < num_shards; s++) {
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GetShard(s)->ApplyToAllCacheEntries(callback, thread_safe);
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}
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}
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void ShardedCache::EraseUnRefEntries() {
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int num_shards = 1 << num_shard_bits_;
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for (int s = 0; s < num_shards; s++) {
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GetShard(s)->EraseUnRefEntries();
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}
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}
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} // namespace rocksdb
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