linux-kernel - Re: [PATCH 2/4] sched: Isolate preempt counting in its own config option

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Message-ID: <1307562434.3941.22.camel@twins>
Date:	Wed, 08 Jun 2011 21:47:14 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 2/4] sched: Isolate preempt counting in its own config
 option

On Wed, 2011-06-08 at 19:48 +0200, Frederic Weisbecker wrote:
> 
> Create a new CONFIG_PREEMPT_COUNT that handles the inc/dec
> of preempt count offset independently. So that the offset
> can be updated by preempt_disable() and preempt_enable()
> even without the need for CONFIG_PREEMPT beeing set.
> 
> This prepares to make CONFIG_DEBUG_SPINLOCK_SLEEP working
> with !CONFIG_PREEMPT where it currently doesn't detect
> code that sleeps inside explicit preemption disabled
> sections. 

The last time this got proposed it got shot down due to the extra
inc/dec stuff all over the place increasing overhead significantly.


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