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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/include/storage/pmsignal.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/pmsignal.h,v 1.16 2007/01/05 22:19:58 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/pmsignal.h,v 1.17 2007/02/15 23:23:23 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@@ -26,7 +26,8 @@ typedef enum
PMSIGNAL_WAKEN_CHILDREN, /* send a SIGUSR1 signal to all backends */
PMSIGNAL_WAKEN_ARCHIVER, /* send a NOTIFY signal to xlog archiver */
PMSIGNAL_ROTATE_LOGFILE, /* send SIGUSR1 to syslogger to rotate logfile */
PMSIGNAL_START_AUTOVAC, /* start an autovacuum iteration */
PMSIGNAL_START_AUTOVAC_LAUNCHER, /* start an autovacuum launcher */
PMSIGNAL_START_AUTOVAC_WORKER, /* start an autovacuum worker */
NUM_PMSIGNALS /* Must be last value of enum! */
} PMSignalReason;