linux-kernel - Re: [PATCH] UBI: Replace yield() with cond

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Date:	Tue, 08 May 2012 15:22:54 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	dedekind1@...il.com
Cc:	Richard Weinberger <richard@....at>, linux-mtd@...ts.infradead.org,
	dwmw2@...radead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] UBI: Replace yield() with cond_resched()

On Tue, 2012-05-08 at 16:23 +0300, Artem Bityutskiy wrote:
> On Tue, 2012-05-08 at 12:59 +0200, Richard Weinberger wrote:
> > > The purpose was different. If we have I/O error, we hope it is a
> > > transient failure. E.g., the HW is temporary unavailable because of an
> > > internal issue. And with yield() we hoped to schedule away for longer
> > > time than usual and let other processes which may affect that HW go
> > > forward and do something.
> > 
> > Okay, yield() is clearly the wrong choice here.
> > cond_resched() is better.
> 
> I do not think it is better. Yes, for I/O I'd suggest
> msleep_interruptible(200) instead.

At least document the intent of that random sleep. Otherwise we'll be
having this same discussion again in a few years or so ;-)
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