mirror of https://github.com/facebook/rocksdb.git
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
// Copyright (c) 2013, 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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#include "dynamic_bloom.h"
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#include <algorithm>
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#include "port/port.h"
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#include "rocksdb/slice.h"
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#include "util/allocator.h"
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#include "util/hash.h"
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namespace rocksdb {
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namespace {
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uint32_t GetTotalBitsForLocality(uint32_t total_bits) {
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uint32_t num_blocks =
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(total_bits + CACHE_LINE_SIZE * 8 - 1) / (CACHE_LINE_SIZE * 8);
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// Make num_blocks an odd number to make sure more bits are involved
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// when determining which block.
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if (num_blocks % 2 == 0) {
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num_blocks++;
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}
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return num_blocks * (CACHE_LINE_SIZE * 8);
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}
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}
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DynamicBloom::DynamicBloom(Allocator* allocator, uint32_t total_bits,
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uint32_t locality, uint32_t num_probes,
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uint32_t (*hash_func)(const Slice& key),
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size_t huge_page_tlb_size,
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Logger* logger)
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: DynamicBloom(num_probes, hash_func) {
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SetTotalBits(allocator, total_bits, locality, huge_page_tlb_size, logger);
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}
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DynamicBloom::DynamicBloom(uint32_t num_probes,
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uint32_t (*hash_func)(const Slice& key))
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: kTotalBits(0),
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kNumBlocks(0),
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kNumProbes(num_probes),
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hash_func_(hash_func == nullptr ? &BloomHash : hash_func) {}
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void DynamicBloom::SetRawData(unsigned char* raw_data, uint32_t total_bits,
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uint32_t num_blocks) {
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data_ = raw_data;
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kTotalBits = total_bits;
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kNumBlocks = num_blocks;
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}
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void DynamicBloom::SetTotalBits(Allocator* allocator,
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uint32_t total_bits, uint32_t locality,
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size_t huge_page_tlb_size,
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Logger* logger) {
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kTotalBits = (locality > 0) ? GetTotalBitsForLocality(total_bits)
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: (total_bits + 7) / 8 * 8;
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kNumBlocks = (locality > 0) ? (kTotalBits / (CACHE_LINE_SIZE * 8)) : 0;
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assert(kNumBlocks > 0 || kTotalBits > 0);
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assert(kNumProbes > 0);
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uint32_t sz = kTotalBits / 8;
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if (kNumBlocks > 0) {
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sz += CACHE_LINE_SIZE - 1;
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}
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assert(allocator);
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raw_ = reinterpret_cast<unsigned char*>(
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allocator->AllocateAligned(sz, huge_page_tlb_size, logger));
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memset(raw_, 0, sz);
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if (kNumBlocks > 0 && (reinterpret_cast<uint64_t>(raw_) % CACHE_LINE_SIZE)) {
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data_ = raw_ + CACHE_LINE_SIZE -
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reinterpret_cast<uint64_t>(raw_) % CACHE_LINE_SIZE;
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} else {
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data_ = raw_;
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}
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}
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} // rocksdb
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