Re: [patch] voluntary-preempt-2.6.8.1-P4

Ingo Molnar
2004-08-20T08:13:17Z

* Lee Revell <rlrevell@joe-job.com> wrote:

> > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P4
>
> I think I am seeing those weird ~1 ms latencies still (actually I am not
> sure I saw before now):
>
> http://krustophenia.net/testresults.php?dataset=2.6.8.1-P4#/var/www/2.6.8.1-P4/kswapd_latency_trace.txt

this is a 9 msec latency in fact. I know what's going on - it's the
get_swap_page() locking - i looked at it once already but there's no
immediate silver arrow. As we allocate more and more swap entries the
longer the scan gets.

Ingo