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83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
/*
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* Copyright (C) 2018 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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#pragma once
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#include "memtable.hh"
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#include "row_cache.hh"
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#include "dirty_memory_manager.hh"
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// makes sure that cache update handles real dirty memory correctly.
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class real_dirty_memory_accounter {
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dirty_memory_manager& _mgr;
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cache_tracker& _tracker;
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uint64_t _bytes;
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uint64_t _uncommitted = 0;
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public:
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real_dirty_memory_accounter(dirty_memory_manager& mgr, cache_tracker& tracker, size_t size);
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real_dirty_memory_accounter(memtable& m, cache_tracker& tracker);
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~real_dirty_memory_accounter();
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real_dirty_memory_accounter(real_dirty_memory_accounter&& c);
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real_dirty_memory_accounter(const real_dirty_memory_accounter& c) = delete;
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// Needs commit() to take effect, or when this object is destroyed.
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void unpin_memory(uint64_t bytes) { _uncommitted += bytes; }
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void commit();
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};
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inline
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real_dirty_memory_accounter::real_dirty_memory_accounter(dirty_memory_manager& mgr, cache_tracker& tracker, size_t size)
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: _mgr(mgr)
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, _tracker(tracker)
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, _bytes(size) {
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_mgr.pin_real_dirty_memory(_bytes);
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}
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inline
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real_dirty_memory_accounter::real_dirty_memory_accounter(memtable& m, cache_tracker& tracker)
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: real_dirty_memory_accounter(m.get_dirty_memory_manager(), tracker, m.occupancy().used_space())
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{ }
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inline
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real_dirty_memory_accounter::~real_dirty_memory_accounter() {
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_mgr.unpin_real_dirty_memory(_bytes);
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}
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inline
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real_dirty_memory_accounter::real_dirty_memory_accounter(real_dirty_memory_accounter&& c)
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: _mgr(c._mgr), _tracker(c._tracker), _bytes(c._bytes), _uncommitted(c._uncommitted) {
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c._bytes = 0;
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c._uncommitted = 0;
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}
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inline
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void real_dirty_memory_accounter::commit() {
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auto bytes = std::exchange(_uncommitted, 0);
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// this should never happen - if it does it is a bug. But we'll try to recover and log
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// instead of asserting. Once it happens, though, it can keep happening until the update is
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// done. So using metrics is better-suited than printing to the logs
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if (bytes > _bytes) {
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_tracker.pinned_dirty_memory_overload(bytes - _bytes);
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}
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auto delta = std::min(bytes, _bytes);
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_bytes -= delta;
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_mgr.unpin_real_dirty_memory(delta);
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}
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