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[NETFILTER]: nf_conntrack: reduce timer updates in __nf_ct_refresh_acct()

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Only update the conntrack timer if there's been at least HZ jiffies since
the last update. Reduces the number of del_timer/add_timer cycles from one
per packet to one per connection per second (plus once for each state change
of a connection)

Should handle timer wraparounds and connection timeout changes.

Signed-off-by: Martin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Martin Josefsson 2006-11-29 02:35:12 +01:00 committed by David S. Miller
parent 824621eddd
commit be00c8e489
1 changed files with 8 additions and 3 deletions
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11
net/netfilter/nf_conntrack_core.c
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@ -864,9 +864,14 @@ void __nf_ct_refresh_acct(struct nf_conn *ct,
ct->timeout.expires = extra_jiffies;
event = IPCT_REFRESH;
} else {
/* Need del_timer for race avoidance (may already be dying). */
if (del_timer(&ct->timeout)) {
ct->timeout.expires = jiffies + extra_jiffies;
unsigned long newtime = jiffies + extra_jiffies;
/* Only update the timeout if the new timeout is at least
HZ jiffies from the old timeout. Need del_timer for race
avoidance (may already be dying). */
if (newtime - ct->timeout.expires >= HZ
&& del_timer(&ct->timeout)) {
ct->timeout.expires = newtime;
add_timer(&ct->timeout);
event = IPCT_REFRESH;
}