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Restructure autovacuum in two processes: a dummy process, which runs

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continuously, and requests vacuum runs of "autovacuum workers" to postmaster.
The workers do the actual vacuum work.  This allows for future improvements,
like allowing multiple autovacuum jobs running in parallel.

For now, the code keeps the original behavior of having a single autovac
process at any time by sleeping until the previous worker has finished.
This commit is contained in:
Alvaro Herrera
2007-02-15 23:23:23 +00:00
parent eecbb33267
commit 1820650934
16 changed files with 807 additions and 250 deletions
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5
src/backend/storage/ipc/ipci.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.90 2007/01/05 22:19:37 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.91 2007/02/15 23:23:23 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@@ -21,6 +21,7 @@
#include "access/twophase.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/bgwriter.h"
#include "postmaster/postmaster.h"
#include "storage/freespace.h"
@@ -109,6 +110,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
size = add_size(size, SInvalShmemSize());
size = add_size(size, FreeSpaceShmemSize());
size = add_size(size, BgWriterShmemSize());
size = add_size(size, AutoVacuumShmemSize());
size = add_size(size, BTreeShmemSize());
#ifdef EXEC_BACKEND
size = add_size(size, ShmemBackendArraySize());
@@ -208,6 +210,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
*/
PMSignalInit();
BgWriterShmemInit();
AutoVacuumShmemInit();
/*
* Set up other modules that need some shared memory space