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Use a WaitLatch for vacuum/autovacuum sleeping 

Instead of using pg_usleep() in vacuum_delay_point(), use a WaitLatch.
This has the advantage that we will realize if the postmaster has been
killed since the last time we decided to sleep while vacuuming.

Reviewed-by: Thomas Munro
Discussion: https://postgr.es/m/CAFh8B=kcdk8k-Y21RfXPu5dX=bgPqJ8TC3p_qxR_ygdBS=JN5w@mail.gmail.com
This commit is contained in:
Stephen Frost 2021-03-30 12:52:56 -04:00
parent 54bb91c30e
commit 4753ef37e0
1 changed files with 5 additions and 3 deletions
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8
src/backend/commands/vacuum.c
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@ -2080,9 +2080,11 @@ vacuum_delay_point(void)
if (msec > VacuumCostDelay * 4)
msec = VacuumCostDelay * 4;
pgstat_report_wait_start(WAIT_EVENT_VACUUM_DELAY);
pg_usleep((long) (msec * 1000));
pgstat_report_wait_end();
(void) WaitLatch(MyLatch,
WL_LATCH_SET | WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
msec,
WAIT_EVENT_VACUUM_DELAY);
ResetLatch(MyLatch);
VacuumCostBalance = 0;