linux-kernel - Re: [RFC] sched: make callers check lock contention for cond_resched

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Message-ID: <1336034127.13683.197.camel@twins>
Date:	Thu, 03 May 2012 10:35:27 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, kvm@...r.kernel.org, avi@...hat.com,
	mtosatti@...hat.com, yoshikawa.takuya@....ntt.co.jp
Subject: Re: [RFC] sched: make callers check lock contention for
 cond_resched_lock()

On Thu, 2012-05-03 at 17:12 +0900, Takuya Yoshikawa wrote:
> 
> Although we can do that using spin_is_contended() and cond_resched(),
> changing cond_resched_lock() to satisfy such a need is another option.
> 
Yeah, not a pretty patch. Changing all cond_resched_lock() sites just to
change one and in such an ugly way too.

So what's the impact of making spin_needbreak() work for !PREEMPT?
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