From: Con Kolivas <kernel@kolivas.org>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, ck@vds.kolivas.org
Subject: Re: [PATCH] vm - swap_prefetch v12
Date: Fri, 30 Sep 2005 09:12:58 +1000 [thread overview]
Message-ID: <200509300912.58722.kernel@kolivas.org> (raw)
In-Reply-To: <20050929145400.1cc2b748.akpm@osdl.org>
On Fri, 30 Sep 2005 07:54 am, Andrew Morton wrote:
> Con Kolivas <kernel@kolivas.org> wrote:
> > Once pages have been added to the swapped list, a timer is started,
> > testing for conditions suitable to prefetch swap pages every 5 seconds.
> > Suitable conditions are defined as lack of swapping out or in any pages,
> > and no watermark tests failing. Significant amounts of dirtied ram also
> > prevent prefetching. It then checks that we have spare ram looking for at
> > least 3* pages_high free per zone and if it succeeds that will prefetch
> > pages from swap.
>
> Did you consider poking around in gendisk.disk_stats to determine whether
> the swap disk(s) are idleish?
I didn't know where to look for that info. Thanks! I'm open to *any*
suggestions and I'll look into it as I can't take this code much further
without outside help.
Cheers,
Con
next prev parent reply other threads:[~2005-09-29 23:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-29 15:15 [PATCH] vm - swap_prefetch v12 Con Kolivas
2005-09-29 21:54 ` Andrew Morton
2005-09-29 23:12 ` Con Kolivas [this message]
2005-09-29 23:24 ` Andrew Morton
2005-09-29 23:42 ` Con Kolivas
2005-09-29 23:52 ` Andrew Morton
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