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Use a WaitLatch for vacuum/autovacuum sleeping

author Stephen Frost <sfrost@snowman.net>

2021年3月30日 16:52:56 +0000 (12:52 -0400)

committer Stephen Frost <sfrost@snowman.net>

2021年3月30日 16:52:56 +0000 (12:52 -0400)

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

src/backend/commands/vacuum.c patch | blob | blame | history

diff --git a/src/backend/commands/vacuum.c b/src/backend/commands/vacuum.c

index c064352e237fb7468651f0dad5c58d8b5d017481..662aff04b45561ed8c6fdea92b8494a8b5ad5e7a 100644 (file)

--- a/src/backend/commands/vacuum.c

+++ b/src/backend/commands/vacuum.c

@@ -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;

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