mirror of https://github.com/facebook/rocksdb.git
112 lines
4.1 KiB
C++
112 lines
4.1 KiB
C++
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "cache/charged_cache.h"
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#include "cache/cache_reservation_manager.h"
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namespace ROCKSDB_NAMESPACE {
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ChargedCache::ChargedCache(std::shared_ptr<Cache> cache,
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std::shared_ptr<Cache> block_cache)
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: CacheWrapper(cache),
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cache_res_mgr_(std::make_shared<ConcurrentCacheReservationManager>(
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std::make_shared<
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CacheReservationManagerImpl<CacheEntryRole::kBlobCache>>(
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block_cache))) {}
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Status ChargedCache::Insert(const Slice& key, ObjectPtr obj,
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const CacheItemHelper* helper, size_t charge,
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Handle** handle, Priority priority,
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const Slice& compressed_val, CompressionType type) {
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Status s = target_->Insert(key, obj, helper, charge, handle, priority,
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compressed_val, type);
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if (s.ok()) {
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// Insert may cause the cache entry eviction if the cache is full. So we
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// directly call the reservation manager to update the total memory used
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// in the cache.
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assert(cache_res_mgr_);
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cache_res_mgr_->UpdateCacheReservation(target_->GetUsage())
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.PermitUncheckedError();
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}
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return s;
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}
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Cache::Handle* ChargedCache::Lookup(const Slice& key,
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const CacheItemHelper* helper,
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CreateContext* create_context,
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Priority priority, Statistics* stats) {
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auto handle = target_->Lookup(key, helper, create_context, priority, stats);
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// Lookup may promote the KV pair from the secondary cache to the primary
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// cache. So we directly call the reservation manager to update the total
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// memory used in the cache.
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if (helper && helper->create_cb) {
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assert(cache_res_mgr_);
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cache_res_mgr_->UpdateCacheReservation(target_->GetUsage())
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.PermitUncheckedError();
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}
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return handle;
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}
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void ChargedCache::WaitAll(AsyncLookupHandle* async_handles, size_t count) {
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target_->WaitAll(async_handles, count);
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// In case of any promotions. Although some could finish by return of
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// StartAsyncLookup, Wait/WaitAll will generally be used, so simpler to
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// update here.
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assert(cache_res_mgr_);
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cache_res_mgr_->UpdateCacheReservation(target_->GetUsage())
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.PermitUncheckedError();
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}
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bool ChargedCache::Release(Cache::Handle* handle, bool useful,
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bool erase_if_last_ref) {
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size_t memory_used_delta = target_->GetUsage(handle);
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bool erased = target_->Release(handle, useful, erase_if_last_ref);
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if (erased) {
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assert(cache_res_mgr_);
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cache_res_mgr_
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->UpdateCacheReservation(memory_used_delta, /* increase */ false)
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.PermitUncheckedError();
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}
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return erased;
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}
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bool ChargedCache::Release(Cache::Handle* handle, bool erase_if_last_ref) {
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size_t memory_used_delta = target_->GetUsage(handle);
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bool erased = target_->Release(handle, erase_if_last_ref);
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if (erased) {
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assert(cache_res_mgr_);
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cache_res_mgr_
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->UpdateCacheReservation(memory_used_delta, /* increase */ false)
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.PermitUncheckedError();
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}
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return erased;
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}
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void ChargedCache::Erase(const Slice& key) {
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target_->Erase(key);
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assert(cache_res_mgr_);
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cache_res_mgr_->UpdateCacheReservation(target_->GetUsage())
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.PermitUncheckedError();
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}
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void ChargedCache::EraseUnRefEntries() {
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target_->EraseUnRefEntries();
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assert(cache_res_mgr_);
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cache_res_mgr_->UpdateCacheReservation(target_->GetUsage())
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.PermitUncheckedError();
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}
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void ChargedCache::SetCapacity(size_t capacity) {
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target_->SetCapacity(capacity);
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// SetCapacity can result in evictions when the cache capacity is decreased,
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// so we would want to update the cache reservation here as well.
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assert(cache_res_mgr_);
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cache_res_mgr_->UpdateCacheReservation(target_->GetUsage())
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.PermitUncheckedError();
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}
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} // namespace ROCKSDB_NAMESPACE
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