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Significantly improve pf purge cpu usage by only taking locks

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when there is work to do.  This reduces CPU consumption to one
third on systems.  This will help keep the thread CPU usage under
control now that the default hash size has increased.

Reviewed by:	kp
Approved by:	re (kib)
Differential Revision:	https://reviews.freebsd.org/D17097
This commit is contained in:
John-Mark Gurney 2018-09-16 00:44:23 +00:00
parent f5450581eb
commit 032d3aaa96
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=338698
1 changed files with 19 additions and 15 deletions
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34
sys/netpfil/pf/pf.c
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@ -1719,24 +1719,28 @@ pf_purge_expired_states(u_int i, int maxcheck)
while (maxcheck > 0) {
ih = &V_pf_idhash[i];
/* only take the lock if we expect to do work */
if (!LIST_EMPTY(&ih->states)) {
relock:
PF_HASHROW_LOCK(ih);
LIST_FOREACH(s, &ih->states, entry) {
if (pf_state_expires(s) <= time_uptime) {
V_pf_status.states -=
pf_unlink_state(s, PF_ENTER_LOCKED);
goto relock;
PF_HASHROW_LOCK(ih);
LIST_FOREACH(s, &ih->states, entry) {
if (pf_state_expires(s) <= time_uptime) {
V_pf_status.states -=
pf_unlink_state(s, PF_ENTER_LOCKED);
goto relock;
}
s->rule.ptr->rule_flag |= PFRULE_REFS;
if (s->nat_rule.ptr != NULL)
s->nat_rule.ptr->rule_flag |= PFRULE_REFS;
if (s->anchor.ptr != NULL)
s->anchor.ptr->rule_flag |= PFRULE_REFS;
s->kif->pfik_flags |= PFI_IFLAG_REFS;
if (s->rt_kif)
s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
}
s->rule.ptr->rule_flag |= PFRULE_REFS;
if (s->nat_rule.ptr != NULL)
s->nat_rule.ptr->rule_flag |= PFRULE_REFS;
if (s->anchor.ptr != NULL)
s->anchor.ptr->rule_flag |= PFRULE_REFS;
s->kif->pfik_flags |= PFI_IFLAG_REFS;
if (s->rt_kif)
s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
PF_HASHROW_UNLOCK(ih);
}
PF_HASHROW_UNLOCK(ih);
/* Return when we hit end of hash. */
if (++i > pf_hashmask) {