Date: Tue, 22 May 2007 12:25:30 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Con Kolivas <kernel@kolivas.org>
Cc: Antonino Ingargiola <tritemio@gmail.com>,
       Nick Piggin <nickpiggin@yahoo.com.au>, Ray Lee <ray-lk@madrabbit.org>,
       ck list <ck@vds.kolivas.org>, Andrew Morton <akpm@linux-foundation.org>,
       linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm: swap prefetch improvements
Message-ID: <20070522102530.GB2344@elte.hu>
References: <20070430162007.ad46e153.akpm@linux-foundation.org> <20070521160029.GA28715@elte.hu> <5486cca80705220315oe4a42a2x366cff682333075c@mail.gmail.com> <200705222020.58474.kernel@kolivas.org>
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* Con Kolivas <kernel@kolivas.org> wrote:

> > > there was nothing else running on the system - so i suspect the 
> > > swapin activity flagged 'itself' as some 'other' activity and 
> > > stopped? The swapins happened in 4 bursts, separated by 5 seconds 
> > > total idleness.
> >
> > I've noted burst swapins separated by some seconds of pause in my 
> > desktop system too (with sp_tester and an idle gnome).
> 
> That really is expected, as just about anything, including journal 
> writeout, would be enough to put it back to sleep for 5 more seconds. 

note that nothing like that happened on my system - in the 
swap-prefetch-off case there was _zero_ IO activity during the sleep 
period.

	Ingo
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