linux-kernel - Re: [RFC][PATCH 1/3] sched: Provide delayed wakeup list

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Message-ID: <1316008220.5040.2.camel@twins>
Date:	Wed, 14 Sep 2011 15:50:20 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	Darren Hart <dvhart@...ux.intel.com>,
	Manfred Spraul <manfred@...orfullife.com>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mike Galbraith <efault@....de>
Subject: Re: [RFC][PATCH 1/3] sched: Provide delayed wakeup list

On Wed, 2011-09-14 at 15:30 +0200, Peter Zijlstra wrote:
> +       if (cmpxchg(&n->next, 0, n) != 0) {
> +               /* It was already queued, drop the extra ref and we're done. */
> +               put_task_struct(p);
> +               return;
> +       }
> +
> +       /*
> +        * The head is context local, there can be no concurrency.
> +        */
> +       n->next = head->first; 

That could of course be folded into one op..
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