a08b640fa7
To avoid stalls when reserving memory for a large bloom filter. The filter creation already has a yielding loop for initialization, this patch extends it to reservation of memory too.
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*
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* Copyright (C) 2015 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "large_bitset.hh"
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#include <algorithm>
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#include <seastar/core/align.hh>
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#include <seastar/core/thread.hh>
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#include "seastarx.hh"
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using namespace seastar;
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large_bitset::large_bitset(size_t nr_bits) : _nr_bits(nr_bits) {
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assert(thread::running_in_thread());
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const size_t orig_nr_ints = align_up(nr_bits, bits_per_int()) / bits_per_int();
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auto nr_ints = orig_nr_ints;
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while (nr_ints) {
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nr_ints = _storage.reserve_partial(nr_ints);
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if (need_preempt()) {
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thread::yield();
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}
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}
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nr_ints = orig_nr_ints;
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while (nr_ints) {
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_storage.push_back(0);
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--nr_ints;
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if (need_preempt()) {
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thread::yield();
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}
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}
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}
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void
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large_bitset::clear() {
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assert(thread::running_in_thread());
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for (auto&& pos: _storage) {
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pos = 0;
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if (need_preempt()) {
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thread::yield();
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}
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}
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}
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