mirror of https://github.com/facebook/rocksdb.git
84 lines
2.7 KiB
C++
84 lines
2.7 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).
|
|
|
|
#include "dynamic_bloom.h"
|
|
|
|
#include <algorithm>
|
|
|
|
#include "port/port.h"
|
|
#include "rocksdb/slice.h"
|
|
#include "util/allocator.h"
|
|
#include "util/hash.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
namespace {
|
|
|
|
uint32_t GetTotalBitsForLocality(uint32_t total_bits) {
|
|
uint32_t num_blocks =
|
|
(total_bits + CACHE_LINE_SIZE * 8 - 1) / (CACHE_LINE_SIZE * 8);
|
|
|
|
// Make num_blocks an odd number to make sure more bits are involved
|
|
// when determining which block.
|
|
if (num_blocks % 2 == 0) {
|
|
num_blocks++;
|
|
}
|
|
|
|
return num_blocks * (CACHE_LINE_SIZE * 8);
|
|
}
|
|
}
|
|
|
|
DynamicBloom::DynamicBloom(Allocator* allocator, uint32_t total_bits,
|
|
uint32_t locality, uint32_t num_probes,
|
|
uint32_t (*hash_func)(const Slice& key),
|
|
size_t huge_page_tlb_size,
|
|
Logger* logger)
|
|
: DynamicBloom(num_probes, hash_func) {
|
|
SetTotalBits(allocator, total_bits, locality, huge_page_tlb_size, logger);
|
|
}
|
|
|
|
DynamicBloom::DynamicBloom(uint32_t num_probes,
|
|
uint32_t (*hash_func)(const Slice& key))
|
|
: kTotalBits(0),
|
|
kNumBlocks(0),
|
|
kNumProbes(num_probes),
|
|
hash_func_(hash_func == nullptr ? &BloomHash : hash_func),
|
|
data_(nullptr) {}
|
|
|
|
void DynamicBloom::SetRawData(unsigned char* raw_data, uint32_t total_bits,
|
|
uint32_t num_blocks) {
|
|
data_ = reinterpret_cast<std::atomic<uint8_t>*>(raw_data);
|
|
kTotalBits = total_bits;
|
|
kNumBlocks = num_blocks;
|
|
}
|
|
|
|
void DynamicBloom::SetTotalBits(Allocator* allocator,
|
|
uint32_t total_bits, uint32_t locality,
|
|
size_t huge_page_tlb_size,
|
|
Logger* logger) {
|
|
kTotalBits = (locality > 0) ? GetTotalBitsForLocality(total_bits)
|
|
: (total_bits + 7) / 8 * 8;
|
|
kNumBlocks = (locality > 0) ? (kTotalBits / (CACHE_LINE_SIZE * 8)) : 0;
|
|
|
|
assert(kNumBlocks > 0 || kTotalBits > 0);
|
|
assert(kNumProbes > 0);
|
|
|
|
uint32_t sz = kTotalBits / 8;
|
|
if (kNumBlocks > 0) {
|
|
sz += CACHE_LINE_SIZE - 1;
|
|
}
|
|
assert(allocator);
|
|
|
|
char* raw = allocator->AllocateAligned(sz, huge_page_tlb_size, logger);
|
|
memset(raw, 0, sz);
|
|
auto cache_line_offset = reinterpret_cast<uintptr_t>(raw) % CACHE_LINE_SIZE;
|
|
if (kNumBlocks > 0 && cache_line_offset > 0) {
|
|
raw += CACHE_LINE_SIZE - cache_line_offset;
|
|
}
|
|
data_ = reinterpret_cast<std::atomic<uint8_t>*>(raw);
|
|
}
|
|
|
|
} // rocksdb
|