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Re: [RFC][PATCH 07/17] sched: Serialize p->cpus_allowed and ttwu() using p->pi_lock

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From: Peter Zijlstra
Subject: Re: [RFC][PATCH 07/17] sched: Serialize p->cpus_allowed and ttwu() using p->pi_lock
Date: Monday, January 3, 2011 - 4:12 am

On Wed, 2010-12-29 at 22:20 +0800, Yong Zhang wrote:

Ah, true, wake_up_new_task() holds task_rq_lock() which is sufficient,
but yes, we could also make that pi_lock.


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[RFC][PATCH 00/17] sched: Reduce runqueue lock contention -v3, Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 02/17] mutex: Use p->on_cpu for the adaptive spin, Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 03/17] sched: Change the ttwu success details, Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 04/17] sched: Clean up ttwu stats, Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 05/17] x86: Optimize arch_spin_unlock_wait(), Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 06/17] sched: Provide p->on_rq, Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 07/17] sched: Serialize p->cpus_allowed and tt ..., Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 08/17] sched: Drop the rq argument to sched_cl ..., Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 11/17] sched: Delay task_contributes_to_load() , Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 12/17] sched: Also serialize ttwu_local() with ..., Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 13/17] sched: Remove rq->lock from the first h ..., Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 14/17] sched: Remove rq argument to ttwu_stat(), Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 15/17] sched: Rename ttwu_post_activation, Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 16/17] sched: Move the second half of ttwu() t ..., Peter Zijlstra, (Fri Dec 24, 5:23 am)
[RFC][PATCH 17/17] sched: Sort hotplug vs ttwu queueing, Peter Zijlstra, (Fri Dec 24, 5:23 am)
Re: [RFC][PATCH 00/17] sched: Reduce runqueue lock content ..., Peter Zijlstra, (Fri Dec 24, 6:15 am)
Re: [RFC][PATCH 05/17] x86: Optimize arch_spin_unlock_wait(), Linus Torvalds, (Fri Dec 24, 11:26 am)
Re: [RFC][PATCH 06/17] sched: Provide p->on_rq, Yong Zhang, (Wed Dec 29, 7:14 am)
Re: [RFC][PATCH 07/17] sched: Serialize p->cpus_allowed an ..., Yong Zhang, (Wed Dec 29, 7:20 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Yong Zhang, (Wed Dec 29, 7:31 am)
Re: [RFC][PATCH 14/17] sched: Remove rq argument to ttwu_s ..., Yong Zhang, (Wed Dec 29, 7:40 am)
Re: [RFC][PATCH 17/17] sched: Sort hotplug vs ttwu queueing, Yong Zhang, (Wed Dec 29, 7:51 am)
Re: [RFC][PATCH 07/17] sched: Serialize p->cpus_allowed an ..., Peter Zijlstra, (Mon Jan 3, 4:12 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Peter Zijlstra, (Mon Jan 3, 4:16 am)
Re: [RFC][PATCH 14/17] sched: Remove rq argument to ttwu_s ..., Peter Zijlstra, (Mon Jan 3, 4:20 am)
Re: [RFC][PATCH 17/17] sched: Sort hotplug vs ttwu queueing, Peter Zijlstra, (Mon Jan 3, 4:21 am)
Re: [RFC][PATCH 05/17] x86: Optimize arch_spin_unlock_wait(), Peter Zijlstra, (Mon Jan 3, 4:32 am)
[RFC][PATCH] sembench: add stddev to the burn stats, Peter Zijlstra, (Mon Jan 3, 7:36 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Oleg Nesterov, (Mon Jan 3, 7:59 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Peter Zijlstra, (Mon Jan 3, 8:21 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Oleg Nesterov, (Mon Jan 3, 8:49 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Peter Zijlstra, (Mon Jan 3, 9:35 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Peter Zijlstra, (Mon Jan 3, 9:41 am)
Re: [RFC][PATCH 12/17] sched: Also serialize ttwu_local() ..., Oleg Nesterov, (Mon Jan 3, 10:32 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Oleg Nesterov, (Mon Jan 3, 11:05 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Yong Zhang, (Mon Jan 3, 10:59 pm)
Re: [RFC][PATCH 05/17] x86: Optimize arch_spin_unlock_wait(), Nick Piggin, (Mon Jan 3, 11:45 pm)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Yong Zhang, (Tue Jan 4, 12:27 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Peter Zijlstra, (Tue Jan 4, 5:34 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Peter Zijlstra, (Tue Jan 4, 6:00 am)
Re: [RFC][PATCH 08/17] sched: Drop the rq argument to sche ..., Peter Zijlstra, (Tue Jan 4, 6:01 am)
Re: [RFC][PATCH 16/17] sched: Move the second half of ttwu ..., Oleg Nesterov, (Tue Jan 4, 7:28 am)
Re: [RFC][PATCH 16/17] sched: Move the second half of ttwu ..., Peter Zijlstra, (Tue Jan 4, 7:47 am)
Re: [RFC][PATCH 16/17] sched: Move the second half of ttwu ..., Oleg Nesterov, (Tue Jan 4, 8:18 am)
Re: [RFC][PATCH 16/17] sched: Move the second half of ttwu ..., Peter Zijlstra, (Tue Jan 4, 8:43 am)
Re: [RFC][PATCH 16/17] sched: Move the second half of ttwu ..., Oleg Nesterov, (Tue Jan 4, 9:06 am)