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Split the buffer mapping table into multiple separately lockable

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partitions, as per discussion.  Passes functionality checks, but
I don't have any performance data yet.
This commit is contained in:
Tom Lane
2006-07-23 03:07:58 +00:00
parent 51ee9fa157
commit 10b9ca3d05
8 changed files with 198 additions and 75 deletions
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14
src/include/storage/lock.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/lock.h,v 1.94 2006/03/05 15:58:59 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/lock.h,v 1.95 2006/07/23 03:07:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -19,23 +19,15 @@
#include "storage/shmem.h"
/*
* Number of partitions the shared lock tables are divided into.
*
* See LockTagToPartition() if you change this.
*/
#define NUM_LOCK_PARTITIONS 16
/* struct PGPROC is declared in proc.h, but must forward-reference it */
typedef struct PGPROC PGPROC;
/* originally in procq.h */
typedef struct PROC_QUEUE
{
SHM_QUEUE links; /* head of list of PGPROC objects */
int size; /* number of entries in list */
} PROC_QUEUE;
/* struct PGPROC is declared in proc.h, but must forward-reference it */
typedef struct PGPROC PGPROC;
/* GUC variables */
extern int max_locks_per_xact;