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afs: Flush vcaches sooner if cache is stressed

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Currently, if the dynamic vcaches feature is enabled, the cache manager
deallocates batches of vcaches (allocated on demand) in the background.
Since this procedure is executed once every 5 minutes (at most), the
number of vcaches can grow unlimitedly between executions, increasing
the cost of using and maintaining them during this timeframe.

To prevent this from happening, run afs_ShakeLooseVCaches() sooner if we
have way more vcaches than the configured threshold.

Change-Id: I10ce7487441c659463ec85b4c8390274c11ef43f
Reviewed-on: https://gerrit.openafs.org/15044
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
This commit is contained in:
Marcio Barbosa 2022-07-05 19:34:47 +00:00 committed by Andrew Deason
parent 3f393cea96
commit 56d5ee3800
1 changed files with 2 additions and 1 deletions
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3
src/afs/afs_daemons.c
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@ -184,7 +184,8 @@ afs_Daemon(void)
last3MinCheck = now;
}
if (afsd_dynamic_vcaches && (last5MinCheck + 300 < now)) {
if (afsd_dynamic_vcaches && ((last5MinCheck + 300 < now) ||
afs_VCacheStressed())) {
/* start with trying to drop us back to our base usage */
int anumber = VCACHE_FREE + (afs_vcount - afs_cacheStats);