linux-kernel - Re: [PATCH] Give kjournald a IOPRIO_CLASS

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Message-ID: <20081002072650.248373ea@infradead.org>
Date:	Thu, 2 Oct 2008 07:26:50 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Dave Chinner <david@...morbit.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] Give kjournald a IOPRIO_CLASS_RT io priority

On Thu, 2 Oct 2008 15:47:37 +0200
Jens Axboe <jens.axboe@...cle.com> wrote:

> Yes, it'll report '0' which means 'not set'. The kernel inteprets 'not
> set' as the default values, BE/4. There's a big diffence, since '0'
> means that we track CPU nice values where as if it returned be/4 then
> that is a strict/fixed setting.

argh. "0" means both "not set" and "highest priority".

how about we fix this?

right now "query + set" isn't idempotent.....
it should be able to be that.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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