linux-kernel - Re: [ck] Re: -mm merge plans for 2.6.23

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 11 Jul 2007 15:18:51 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Matthew Hawkins <darthmdh@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>, ck list <ck@....kolivas.org>,
	Ingo Molnar <mingo@...e.hu>, Paul Jackson <pj@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [ck] Re: -mm merge plans for 2.6.23

Matthew Hawkins wrote:
> On 7/11/07, Andrew Morton <akpm@...ux-foundation.org> wrote:

> Anyhow with swap prefetch, applications that may have been sitting
> there idle for a while become responsive in the single-digit seconds
> rather than double-digit or worse.  The same goes for a morning wakeup
> (ie after nightly cron jobs throw things out)

OK that's a good data point. It would be really good to be able to
do an analysis on your overnight IO patterns and the corresponding
memory reclaim behaviour and see why things are getting evicted.

Not that swap prefetching isn't a good solution for this situation,
but the fact that things are getting swapped out for you also means
that mapped files and possibly important pagecache and dentries are
being flushed out, which we might be able to avoid.

Thanks,
Nick

-- 
SUSE Labs, Novell Inc.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/