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Move the increment operation under the lock and split the condition

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variable into two so that we can see on which one we are waiting.
This might also more properly propagate the update of the
flowclean_cycles flag and avoid "hangs" people were seeing.

Suggested by:	rwatson [1]
Sponsored by:	ISPsystem [1]
Reviewed by:	julian [1]
Updated by:	Mikolaj Golub (to.my.trociny gmail.com)
Tested by:	Mikolaj Golub (to.my.trociny gmail.com)
MFC After:	1 week

[1] Early 2010, initial version.
This commit is contained in:
Bjoern A. Zeeb 2010-12-31 21:06:52 +00:00
parent 09683f46b9
commit f0a56b0678
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=216855
1 changed files with 10 additions and 8 deletions
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18
sys/net/flowtable.c
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@ -195,7 +195,8 @@ static VNET_DEFINE(uma_zone_t, flow_ipv6_zone);
#define V_flow_ipv6_zone VNET(flow_ipv6_zone)
static struct cv flowclean_cv;
static struct cv flowclean_f_cv;
static struct cv flowclean_c_cv;
static struct mtx flowclean_lock;
static uint32_t flowclean_cycles;
static uint32_t flowclean_freq;
@ -951,7 +952,7 @@ flow_full(struct flowtable *ft)
if ((ft->ft_flags & FL_HASH_ALL) == 0)
ft->ft_udp_idle = ft->ft_fin_wait_idle =
ft->ft_syn_idle = ft->ft_tcp_idle = 5;
cv_broadcast(&flowclean_cv);
cv_broadcast(&flowclean_c_cv);
} else if (!full && ft->ft_full) {
flowclean_freq = 20*hz;
if ((ft->ft_flags & FL_HASH_ALL) == 0)
@ -1560,14 +1561,14 @@ flowtable_cleaner(void)
}
VNET_LIST_RUNLOCK();
flowclean_cycles++;
/*
* The 10 second interval between cleaning checks
* is arbitrary
*/
mtx_lock(&flowclean_lock);
cv_broadcast(&flowclean_cv);
cv_timedwait(&flowclean_cv, &flowclean_lock, flowclean_freq);
flowclean_cycles++;
cv_broadcast(&flowclean_f_cv);
cv_timedwait(&flowclean_c_cv, &flowclean_lock, flowclean_freq);
mtx_unlock(&flowclean_lock);
}
}
@ -1580,8 +1581,8 @@ flowtable_flush(void *unused __unused)
mtx_lock(&flowclean_lock);
start = flowclean_cycles;
while (start == flowclean_cycles) {
cv_broadcast(&flowclean_cv);
cv_wait(&flowclean_cv, &flowclean_lock);
cv_broadcast(&flowclean_c_cv);
cv_wait(&flowclean_f_cv, &flowclean_lock);
}
mtx_unlock(&flowclean_lock);
}
@ -1613,7 +1614,8 @@ static void
flowtable_init(const void *unused __unused)
{
cv_init(&flowclean_cv, "flowcleanwait");
cv_init(&flowclean_c_cv, "c_flowcleanwait");
cv_init(&flowclean_f_cv, "f_flowcleanwait");
mtx_init(&flowclean_lock, "flowclean lock", NULL, MTX_DEF);
EVENTHANDLER_REGISTER(ifnet_departure_event, flowtable_flush, NULL,
EVENTHANDLER_PRI_ANY);