mirror of https://github.com/facebook/rocksdb.git
79 lines
2.4 KiB
C++
79 lines
2.4 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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#include "table/plain/plain_table_bloom.h"
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#include <string>
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#include <algorithm>
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#include "util/dynamic_bloom.h"
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#include "memory/allocator.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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PlainTableBloomV1::PlainTableBloomV1(uint32_t num_probes)
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: kTotalBits(0), kNumBlocks(0), kNumProbes(num_probes), data_(nullptr) {}
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void PlainTableBloomV1::SetRawData(unsigned char* raw_data, uint32_t total_bits,
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uint32_t num_blocks) {
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data_ = reinterpret_cast<uint8_t*>(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 PlainTableBloomV1::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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char* raw = allocator->AllocateAligned(sz, huge_page_tlb_size, logger);
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memset(raw, 0, sz);
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auto cache_line_offset = reinterpret_cast<uintptr_t>(raw) % CACHE_LINE_SIZE;
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if (kNumBlocks > 0 && cache_line_offset > 0) {
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raw += CACHE_LINE_SIZE - cache_line_offset;
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}
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data_ = reinterpret_cast<uint8_t*>(raw);
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}
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void BloomBlockBuilder::AddKeysHashes(const std::vector<uint32_t>& keys_hashes) {
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for (auto hash : keys_hashes) {
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bloom_.AddHash(hash);
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}
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}
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Slice BloomBlockBuilder::Finish() { return bloom_.GetRawData(); }
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const std::string BloomBlockBuilder::kBloomBlock = "kBloomBlock";
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} // namespace rocksdb
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