linux-kernel - Re: [PATCH][resubmit] x86: enable preemption in delay

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Message-Id: <200806190318.07684.nickpiggin@yahoo.com.au>
Date:	Thu, 19 Jun 2008 03:18:07 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Gregory Haskins <ghaskins@...ell.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi-suse@...stfloor.org>,
	Clark Williams <clark.williams@...il.com>,
	Marin Mitov <mitov@...p.bas.bg>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>, akpm@...l.org,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH][resubmit] x86: enable preemption in delay

On Thursday 19 June 2008 02:16, Steven Rostedt wrote:
> On Wed, 18 Jun 2008, Nick Piggin wrote:
> > There are _some_ cases where it can be used, but nobody has been
> > able to come up with compelling uses really. I don't think this
> > case is helped very much either because the logic in there using
> > preempt-disable is fine, isn't it?
> >
> > Except that it should also have a cond_resched in it. Seems like
> > an ideal place to put cond_resched because it is not a fastpath.
>
> Does it really need a cond_resched? preempt_enable when it goes to zero
> will already check to see if it should schedule.

It doesn't really need one, but of course having one would help
non preempt kernels.
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