From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
Darren Hart <dvhart@linux.intel.com>,
Manfred Spraul <manfred@colorfullife.com>,
David Miller <davem@davemloft.net>,
Eric Dumazet <eric.dumazet@gmail.com>,
Mike Galbraith <efault@gmx.de>
Subject: Re: [RFC][PATCH 1/3] sched: Provide delayed wakeup list
Date: Wed, 14 Sep 2011 15:50:20 +0200 [thread overview]
Message-ID: <1316008220.5040.2.camel@twins> (raw)
In-Reply-To: <20110914133750.739484417@chello.nl>
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..
next prev parent reply other threads:[~2011-09-14 13:50 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-14 13:30 [RFC][PATCH 0/3] delayed wakeup list Peter Zijlstra
2011-09-14 13:30 ` [RFC][PATCH 1/3] sched: Provide " Peter Zijlstra
2011-09-14 13:50 ` Peter Zijlstra [this message]
2011-09-14 14:08 ` Eric Dumazet
2011-09-14 14:12 ` Peter Zijlstra
2011-09-14 15:35 ` Darren Hart
2011-09-14 15:39 ` Peter Zijlstra
2011-09-14 15:49 ` Darren Hart
2011-09-16 7:59 ` Paul Turner
2011-09-16 7:59 ` Paul Turner
2011-09-16 8:48 ` Peter Zijlstra
2011-10-02 14:01 ` Manfred Spraul
2011-10-03 10:23 ` Peter Zijlstra
2011-09-14 13:30 ` [RFC][PATCH 2/3] futex: Reduce hash bucket lock contention Peter Zijlstra
2011-09-14 15:46 ` Darren Hart
2011-09-14 15:51 ` Peter Zijlstra
2011-09-14 16:00 ` Darren Hart
2011-09-14 20:49 ` Thomas Gleixner
2011-09-16 12:34 ` Peter Zijlstra
2011-09-17 12:57 ` Manfred Spraul
2011-09-19 7:37 ` Peter Zijlstra
2011-09-19 8:51 ` Peter Zijlstra
2011-09-14 13:30 ` [RFC][PATCH 3/3] ipc/sem: Rework wakeup scheme Peter Zijlstra
2011-09-15 17:29 ` Manfred Spraul
2011-09-15 19:32 ` Peter Zijlstra
2011-09-15 19:35 ` Peter Zijlstra
2011-09-15 19:45 ` Peter Zijlstra
2011-09-17 12:36 ` Manfred Spraul
2011-09-16 12:18 ` Peter Zijlstra
2011-09-17 12:32 ` Manfred Spraul
2011-09-16 12:39 ` Peter Zijlstra
2011-09-14 13:51 ` [RFC][PATCH 0/3] delayed wakeup list Eric Dumazet
2011-09-14 13:56 ` Peter Zijlstra
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