linux-kernel - Re: [PATCH] mm: swap prefetch improvements

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Date:	Tue, 22 May 2007 12:25:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	Antonino Ingargiola <tritemio@...il.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ray Lee <ray-lk@...rabbit.org>, ck list <ck@....kolivas.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: swap prefetch improvements


* Con Kolivas <kernel@...ivas.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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