Fix unexpected reversal of lists during catcache rehash During catcache searches, the most-recently searched entries are kept at the head of the list to speed up subsequent searches, keeping the "freshest" entries at its beginning. A rehash of the catcache was doing the opposite: fresh entries were moved to the tail of the newly-created buckets, causing a rehash to slow down a bit.
When a rehash is done, this commit switches the code to use dlist_push_tail() instead of dlist_push_head(), so as fresh entries are kept at the head of the lists, not their tail. Author: ChangAo Chen <[email protected]> Reviewed-by: John Naylor <[email protected]> Reviewed-by: Michael Paquier <[email protected]> Discussion: https://postgr.es/m/[email protected] Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/68119480a763d761a9cf2413f4320d9a5d4b34d5 Modified Files -------------- src/backend/utils/cache/catcache.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-)
