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From: Tejun Heo <htejun@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Gautham R Shenoy <ego@linux.vnet.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Abdul Haleem <abdhalee@linux.vnet.ibm.com>,
	Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	kernel-team@fb.com
Subject: Re: [PATCH 1/2] workqueue: Move wq_update_unbound_numa() to the beginning of CPU_ONLINE
Date: Tue, 21 Jun 2016 15:43:56 -0400	[thread overview]
Message-ID: <20160621194356.GU3262@mtj.duckdns.org> (raw)
In-Reply-To: <20160621193709.GT30154@twins.programming.kicks-ass.net>

On Tue, Jun 21, 2016 at 09:37:09PM +0200, Peter Zijlstra wrote:
> Hurm.. So I've applied it, just to get this issue sorted, but I'm not
> entirely sure I like it.
> 
> I think I prefer ego's version because that makes it harder to get stuff
> to run on !active,online cpus. I think we really want to be careful what
> gets to run during that state.

The original patch just did set_cpus_allowed one more time late enough
so that the target kthread (in most cases) doesn't have to go through
fallback rq selection afterwards.  I don't know what the long term
solution is but CPU_ONLINE callbacks should be able to bind kthreads
to the new CPU one way or the other.

Thanks.

-- 
tejun

  reply	other threads:[~2016-06-21 19:44 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <573D9C2D.4020609@linux.vnet.ibm.com>
     [not found] ` <20160526151137.GA26508@in.ibm.com>
2016-06-07 12:29   ` WARNING at kernel/sched/core.c:1166 while booting 4.6.0 mainline on ppc64le bare metal Abdul Haleem
2016-06-07 15:14     ` [PATCH 0/2] Fix CPU Online handling for unbounded worker threads Gautham R. Shenoy
2016-06-07 15:14       ` [PATCH 1/2] workqueue: Move wq_update_unbound_numa() to the beginning of CPU_ONLINE Gautham R. Shenoy
2016-06-15 15:53         ` Tejun Heo
2016-06-15 19:28           ` Gautham R Shenoy
2016-06-16 19:35             ` Tejun Heo
2016-06-21 14:12               ` Gautham R Shenoy
2016-06-21 15:36                 ` Tejun Heo
2016-06-21 19:37                   ` Peter Zijlstra
2016-06-21 19:43                     ` Tejun Heo [this message]
2016-06-21 19:47                       ` Peter Zijlstra
2016-06-22  5:15                         ` Gautham R Shenoy
2016-06-24  9:00               ` [tip:sched/urgent] sched/core: Allow kthreads to fall back to online && !active cpus tip-bot for Tejun Heo
2016-06-07 15:14       ` [PATCH 2/2] workqueue:Fix affinity of an unbound worker of a node with 1 online CPU Gautham R. Shenoy
2016-06-08  6:03         ` Abdul Haleem
2016-06-14 11:22         ` Peter Zijlstra
2016-06-15 10:19           ` Gautham R Shenoy
2016-06-15 11:32             ` Peter Zijlstra
2016-06-15 12:50               ` Gautham R Shenoy
2016-06-15 13:14                 ` Peter Zijlstra
2016-06-15 16:01                   ` Tejun Heo
2016-06-16 12:11                     ` Michael Ellerman
2016-06-16 12:45                       ` Peter Zijlstra
2016-06-16 19:39                         ` Tejun Heo
2016-06-17  1:49                           ` Michael Ellerman
2016-07-15  5:27                           ` Gautham R Shenoy
     [not found]                           ` <57887507.911f240a.687de.08c5SMTPIN_ADDED_BROKEN@mx.google.com>
2016-07-15 12:10                             ` Tejun Heo
2016-06-13  5:44       ` [PATCH 0/2] Fix CPU Online handling for unbounded worker threads Gautham R Shenoy

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