Thread: pgsql: Optimize check for pending backend IO stats
Optimize check for pending backend IO stats This commit changes the backend stats code so as we rely on a single boolean rather than a repeated check based on pg_memory_is_all_zeros() in the code, making it cheaper should PgStat_PendingIO get bigger in size. The frequency of backend stats reports is not a bottleneck, but there is no reason to not make that cheaper, and the logic is simple as the only entry points updating backend IO stats are pgstat_count_backend_io_op() and pgstat_count_backend_io_op_time(). Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com> Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com> Discussion: https://postgr.es/m/Z8WYf1jyy4MwOveQ@ip-10-97-1-34.eu-west-3.compute.internal Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/6d3ea48ff1aea5fb1ccfed69424bf93a8643b4a4 Modified Files -------------- src/backend/utils/activity/pgstat_backend.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)