mirror of https://github.com/facebook/rocksdb.git
100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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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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#pragma once
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#include <atomic>
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#include <vector>
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#include "port/jemalloc_helper.h"
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#include "port/port.h"
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#include "rocksdb/memory_allocator.h"
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#include "util/thread_local.h"
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#include "utilities/memory_allocators.h"
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#if defined(ROCKSDB_JEMALLOC) && defined(ROCKSDB_PLATFORM_POSIX)
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#include <sys/mman.h>
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#if (JEMALLOC_VERSION_MAJOR >= 5) && defined(MADV_DONTDUMP)
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#define ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
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#endif // (JEMALLOC_VERSION_MAJOR >= 5) && MADV_DONTDUMP
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#endif // ROCKSDB_JEMALLOC && ROCKSDB_PLATFORM_POSIX
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namespace ROCKSDB_NAMESPACE {
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// Allocation requests are randomly sharded across
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// `JemallocAllocatorOptions::num_arenas` arenas to reduce contention on per-
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// arena mutexes.
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class JemallocNodumpAllocator : public BaseMemoryAllocator {
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public:
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explicit JemallocNodumpAllocator(const JemallocAllocatorOptions& options);
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#ifdef ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
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~JemallocNodumpAllocator();
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#endif // ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
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static const char* kClassName() { return "JemallocNodumpAllocator"; }
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const char* Name() const override { return kClassName(); }
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static bool IsSupported() {
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std::string unused;
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return IsSupported(&unused);
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}
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static bool IsSupported(std::string* why);
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bool IsMutable() const { return !init_; }
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Status PrepareOptions(const ConfigOptions& config_options) override;
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#ifdef ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
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void* Allocate(size_t size) override;
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void Deallocate(void* p) override;
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size_t UsableSize(void* p, size_t allocation_size) const override;
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#endif // ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
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private:
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#ifdef ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
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Status InitializeArenas();
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uint32_t GetArenaIndex() const;
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// Custom alloc hook to replace jemalloc default alloc.
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static void* Alloc(extent_hooks_t* extent, void* new_addr, size_t size,
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size_t alignment, bool* zero, bool* commit,
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unsigned arena_ind);
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// Destroy arena on destruction of the allocator, or on failure.
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static Status DestroyArena(uint32_t arena_index);
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// Destroy tcache on destruction of the allocator, or thread exit.
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static void DestroyThreadSpecificCache(void* ptr);
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// Get or create tcache. Return flag suitable to use with `mallocx`:
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// either MALLOCX_TCACHE_NONE or MALLOCX_TCACHE(tc).
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int GetThreadSpecificCache(size_t size);
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#endif // ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
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JemallocAllocatorOptions options_;
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#ifdef ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
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// A function pointer to jemalloc default alloc. Use atomic to make sure
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// NewJemallocNodumpAllocator is thread-safe.
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//
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// Hack: original_alloc_ needs to be static for Alloc() to access it.
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// alloc needs to be static to pass to jemalloc as function pointer. We can
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// use a single process-wide value as long as we assume that any newly created
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// arena has the same original value in its `alloc` function pointer.
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static std::atomic<extent_alloc_t*> original_alloc_;
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// Custom hooks has to outlive corresponding arena.
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std::vector<std::unique_ptr<extent_hooks_t>> per_arena_hooks_;
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// Hold thread-local tcache index.
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ThreadLocalPtr tcache_;
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std::vector<uint32_t> arena_indexes_;
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#endif // ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
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bool init_ = false;
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};
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} // namespace ROCKSDB_NAMESPACE
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