linux-kernel - Re: [GIT PULL] block bits for 2.6.30-rc3

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Date:	Wed, 22 Apr 2009 14:40:09 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Damien Wyart <damien.wyart@...e.fr>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] block bits for 2.6.30-rc3

On Wed, Apr 22 2009, Damien Wyart wrote:
> Hello,
> 
> > A collection of fixes for 2.6.30-rc3. It includes fixes for
> > regressions and bug fixes in general, along with two buglets in CFQ.
> > Please pull.
> 
> What about this bug in CFQ: http://lkml.org/lkml/2009/4/20/68 ?
> 
> Do you plan to have it fixed for 2.6.30 or will it wait until 2.6.31?

Not sure. In theory we could just do the one-liner and make
->slice_resid negative (like below), but it needs some targetted
testing. And given that it's been there for several releases, it's not
really a rush to get it fixed for 2.6.30.

But I'll definitely throw it into the testing mix, and if deemed safe
enough, get it in there for 2.6.30.

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 7e13f04..17549f7 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -887,7 +887,7 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
 	 * store what was left of this slice, if the queue idled/timed out
 	 */
 	if (timed_out && !cfq_cfqq_slice_new(cfqq)) {
-		cfqq->slice_resid = cfqq->slice_end - jiffies;
+		cfqq->slice_resid = jiffies - cfqq->slice_end;
 		cfq_log_cfqq(cfqd, cfqq, "resid=%ld", cfqq->slice_resid);
 	}
 

-- 
Jens Axboe

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