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https://github.com/FirebirdSQL/firebird.git
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f7e248ca63
Improvement CORE-4936 : Reduce internal contention in background garbage collector Other small improvements: - garbage collector\sweep now skip record header if transaction is below OIT - it allows to reduce number of page fetches - missed points to gather RECORD_FRAGMENT_READS and RECORD_BACKVERSION_READS statistics
127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
/*
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* The contents of this file are subject to the Initial
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* Developer's Public License Version 1.0 (the "License");
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* you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
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*
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* Software distributed under the License is distributed AS IS,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Original Code was created by Vlad Khorsun
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2011 Vlad Khorsun <hvlad@users.sourceforge.net>
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* and all contributors signed below.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#ifndef JRD_GARBAGE_COLLECTOR_H
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#define JRD_GARBAGE_COLLECTOR_H
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#include "firebird.h"
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#include "../common/classes/array.h"
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#include "../common/classes/GenericMap.h"
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#include "../common/classes/SyncObject.h"
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#include "../jrd/sbm.h"
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namespace Jrd {
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class Database;
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class Savepoint;
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class GarbageCollector
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{
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public:
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GarbageCollector(MemoryPool& p, Database* dbb)
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: m_pool(p), m_relations(m_pool), m_nextRelID(0)
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{}
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~GarbageCollector();
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TraNumber addPage(const USHORT relID, const ULONG pageno, const TraNumber tranid);
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PageBitmap* getPages(const TraNumber oldest_snapshot, USHORT &relID);
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void removeRelation(const USHORT relID);
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void sweptRelation(const TraNumber oldest_snapshot, const USHORT relID);
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private:
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struct PageTran
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{
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PageTran() :
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pageno(0),
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tranid(0)
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{}
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PageTran(const ULONG _pageno, const TraNumber _tranid) :
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pageno(_pageno),
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tranid(_tranid)
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{}
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ULONG pageno;
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TraNumber tranid;
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static const ULONG& generate(const void*, const PageTran& item)
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{
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return item.pageno;
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}
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};
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typedef Firebird::BePlusTree<PageTran, ULONG, MemoryPool, PageTran> PageTranMap;
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class RelationData
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{
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public:
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explicit RelationData(MemoryPool& p, USHORT relID)
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: m_pool(p), m_pages(p), m_relID(relID)
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{}
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~RelationData()
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{
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clear();
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}
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TraNumber addPage(const ULONG pageno, const TraNumber tranid);
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TraNumber findPage(const ULONG pageno, const TraNumber tranid);
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void swept(const TraNumber oldest_snapshot, PageBitmap** bm = NULL);
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USHORT getRelID() const
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{
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return m_relID;
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}
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static inline const USHORT generate(const RelationData* item)
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{
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return item->m_relID;
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}
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void clear();
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Firebird::MemoryPool& m_pool;
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Firebird::SyncObject m_sync;
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PageTranMap m_pages;
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USHORT m_relID;
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};
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typedef Firebird::SortedArray<
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RelationData*,
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Firebird::EmptyStorage<RelationData*>,
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USHORT,
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RelationData> RelGarbageArray;
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RelationData* getRelData(Firebird::Sync& sync, const USHORT relID, bool allowCreate);
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Firebird::MemoryPool& m_pool;
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Firebird::SyncObject m_sync;
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RelGarbageArray m_relations;
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USHORT m_nextRelID;
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};
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} // namespace Jrd
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#endif // JRD_GARBAGE_COLLECTOR_H
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