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Add lock_timeout configuration parameter.

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This GUC allows limiting the time spent waiting to acquire any one
heavyweight lock.

In support of this, improve the recently-added timeout infrastructure
to permit efficiently enabling or disabling multiple timeouts at once.
That reduces the performance hit from turning on lock_timeout, though
it's still not zero.

Zoltán Böszörményi, reviewed by Tom Lane,
Stephen Frost, and Hari Babu
This commit is contained in:
Tom Lane
2013-03-16 23:22:17 -04:00
parent d2bef5f7db
commit d43837d030
16 changed files with 511 additions and 116 deletions
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10
src/backend/postmaster/autovacuum.c
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@@ -547,10 +547,11 @@ AutoVacLauncherMain(int argc, char *argv[])
SetConfigOption("zero_damaged_pages", "false", PGC_SUSET, PGC_S_OVERRIDE);
/*
* Force statement_timeout to zero to avoid a timeout setting from
* preventing regular maintenance from being executed.
* Force statement_timeout and lock_timeout to zero to avoid letting these
* settings prevent regular maintenance from being executed.
*/
SetConfigOption("statement_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
SetConfigOption("lock_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
/*
* Force default_transaction_isolation to READ COMMITTED. We don't want
@@ -1573,10 +1574,11 @@ AutoVacWorkerMain(int argc, char *argv[])
SetConfigOption("zero_damaged_pages", "false", PGC_SUSET, PGC_S_OVERRIDE);
/*
* Force statement_timeout to zero to avoid a timeout setting from
* preventing regular maintenance from being executed.
* Force statement_timeout and lock_timeout to zero to avoid letting these
* settings prevent regular maintenance from being executed.
*/
SetConfigOption("statement_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
SetConfigOption("lock_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
/*
* Force default_transaction_isolation to READ COMMITTED. We don't want