rocksdb/util/jemalloc_nodump_allocator.h
Yi Wu 327097c952 JemallocAllocator: thread-local tcache (#4603)
Summary:
Add option to support  thread-local tcache to reduce mutex contention inside Jemalloc arena.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4603

Differential Revision: D12830738

Pulled By: yiwu-arbug

fbshipit-source-id: 59bd25b165b903f23a6a8531b18d72e140d69f65
2018-11-19 22:39:08 -08:00

76 lines
2.5 KiB
C++

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include <atomic>
#include <vector>
#include "port/port.h"
#include "rocksdb/memory_allocator.h"
#include "util/core_local.h"
#include "util/thread_local.h"
#if defined(ROCKSDB_JEMALLOC) && defined(ROCKSDB_PLATFORM_POSIX)
#include <jemalloc/jemalloc.h>
#include <sys/mman.h>
#if (JEMALLOC_VERSION_MAJOR >= 5) && defined(MADV_DONTDUMP)
#define ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
namespace rocksdb {
class JemallocNodumpAllocator : public MemoryAllocator {
public:
JemallocNodumpAllocator(std::unique_ptr<extent_hooks_t>&& arena_hooks,
unsigned arena_index);
~JemallocNodumpAllocator();
const char* Name() const override { return "JemallocNodumpAllocator"; }
void* Allocate(size_t size) override;
void Deallocate(void* p) override;
size_t UsableSize(void* p, size_t allocation_size) const override;
private:
friend Status NewJemallocNodumpAllocator(
std::shared_ptr<MemoryAllocator>* memory_allocator);
// Custom alloc hook to replace jemalloc default alloc.
static void* Alloc(extent_hooks_t* extent, void* new_addr, size_t size,
size_t alignment, bool* zero, bool* commit,
unsigned arena_ind);
// Destroy arena on destruction of the allocator, or on failure.
static Status DestroyArena(unsigned arena_index);
// Destroy tcache on destruction of the allocator, or thread exit.
static void DestroyThreadSpecificCache(void* ptr);
// Get or create tcache. Return flag suitable to use with `mallocx`:
// either MALLOCX_TCACHE_NONE or MALLOCX_TCACHE(tc).
int GetThreadSpecificCache();
// A function pointer to jemalloc default alloc. Use atomic to make sure
// NewJemallocNodumpAllocator is thread-safe.
//
// Hack: original_alloc_ needs to be static for Alloc() to access it.
// alloc needs to be static to pass to jemalloc as function pointer.
static std::atomic<extent_alloc_t*> original_alloc_;
// Custom hooks has to outlive corresponding arena.
const std::unique_ptr<extent_hooks_t> arena_hooks_;
// Arena index.
const unsigned arena_index_;
// Hold thread-local tcache index.
ThreadLocalPtr tcache_;
};
} // namespace rocksdb
#endif // (JEMALLOC_VERSION_MAJOR >= 5) && MADV_DONTDUMP
#endif // ROCKSDB_JEMALLOC && ROCKSDB_PLATFORM_POSIX