linux-kernel - Re: 2.6.21-mm1: many processes end up in D state

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Date:	Tue, 01 May 2007 10:40:03 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.21-mm1: many processes end up in D state

Andrew Morton napsal(a):
> I would check the anticipatory scheduler as well, please.  I don't know
> what no-op would do with a workload like that, but it probably isn't very
> good.
> 
> You appear to believe that it's related to the CPU scheduler?  

Oh, no. I have really no idea, what may cause this :).

> That's a bit
> unexpected - it sounds more like a VFS/IO thing?  But stranger things have
> happened.

I think so.

> I guess it's time to end the staircase experiment in -mm. 
> http://userweb.kernel.org/~akpm/js.bz2 is my current rollup (against
> 2.6.21) minus staircase and related things.  Pretty please.

Anticipatory + -js is no change. Going to try vanilla and in both cases whether
it works or not, I'll bisect either -mm or vanilla.

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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