From: Peter Zijlstra <peterz@infradead.org>
To: Tejun Heo <tj@kernel.org>
Cc: tglx@linutronix.de, mingo@elte.hu, avi@redhat.com, efault@gmx.de,
rusty@rustcorp.com.au, linux-kernel@vger.kernel.org,
Gautham R Shenoy <ego@in.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 4/7] sched: implement force_cpus_allowed()
Date: Tue, 08 Dec 2009 12:48:05 +0100 [thread overview]
Message-ID: <1260272885.3935.1189.camel@laptop> (raw)
In-Reply-To: <4B1E378A.5050101@kernel.org>
On Tue, 2009-12-08 at 20:24 +0900, Tejun Heo wrote:
>
> Let me augment the above sentence. Yes, that's all I need *during
> CPU_DOWN*. During CPU_UP, I need to migrate back left running workers
> which survived from the last CPU_DOWN. In the original patch, the
> down path is worker_maybe_bind_and_lock() and the latter path is
> trustee_unset_rogue().
Why bother with that?
workqueue's CPU_POST_DEAD will flush the workqueue and destroy all
threads under cpu_add_remove_lock, which excludes the cpu from coming
back up before its fully destroyed.
So there's no remaining tasks to be migrated back.
Changing that semantics is not worthwhile.
next prev parent reply other threads:[~2009-12-08 11:48 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-02 3:56 [PATCHSET tip/sched/core] sched: concurrency managed workqueue related sched patches Tejun Heo
2009-12-02 3:56 ` [PATCH 1/7] sched: revert 498657a478c60be092208422fefa9c7b248729c2 Tejun Heo
2009-12-02 10:42 ` [tip:sched/core] sched: Revert 498657a478c60be092208422fefa9c7b248729c2 tip-bot for Tejun Heo
2009-12-02 3:56 ` [PATCH 2/7] sched: rename preempt_notifiers to sched_notifiers and refactor implementation Tejun Heo
2009-12-02 3:56 ` [PATCH 3/7] sched: refactor try_to_wake_up() Tejun Heo
2009-12-02 9:05 ` Mike Galbraith
2009-12-02 9:51 ` Tejun Heo
2009-12-02 10:10 ` Mike Galbraith
2009-12-02 10:14 ` Tejun Heo
2009-12-02 11:01 ` Peter Zijlstra
2009-12-03 6:11 ` [PATCH UDPATED " Tejun Heo
2009-12-02 3:56 ` [PATCH 4/7] sched: implement force_cpus_allowed() Tejun Heo
2009-12-04 10:40 ` Peter Zijlstra
2009-12-04 10:43 ` Peter Zijlstra
2009-12-07 4:34 ` Tejun Heo
2009-12-07 8:35 ` Peter Zijlstra
2009-12-07 10:34 ` Tejun Heo
2009-12-07 10:54 ` Peter Zijlstra
2009-12-07 11:07 ` Tejun Heo
2009-12-08 8:41 ` Tejun Heo
2009-12-08 9:02 ` Peter Zijlstra
2009-12-08 9:12 ` Tejun Heo
2009-12-08 10:34 ` Peter Zijlstra
2009-12-08 10:38 ` Peter Zijlstra
2009-12-08 11:26 ` Tejun Heo
2009-12-08 11:24 ` Tejun Heo
2009-12-08 11:48 ` Peter Zijlstra [this message]
2009-12-08 11:56 ` Tejun Heo
2009-12-08 12:10 ` Peter Zijlstra
2009-12-08 12:23 ` Tejun Heo
2009-12-08 13:35 ` Peter Zijlstra
2009-12-09 5:25 ` Tejun Heo
2009-12-09 7:41 ` Peter Zijlstra
2009-12-09 8:03 ` Tejun Heo
2009-12-02 3:56 ` [PATCH 5/7] sched: make sched_notifiers unconditional Tejun Heo
2009-12-02 3:56 ` [PATCH 6/7] sched: add wakeup/sleep sched_notifiers and allow NULL notifier ops Tejun Heo
2009-12-02 3:56 ` [PATCH 7/7] sched: implement try_to_wake_up_local() Tejun Heo
2009-12-03 6:13 ` [PATCH UPDATED " Tejun Heo
2009-12-04 10:47 ` Peter Zijlstra
2009-12-07 3:31 ` Tejun Heo
2009-12-04 10:44 ` [PATCH " Peter Zijlstra
2009-12-07 3:26 ` Tejun Heo
2009-12-07 8:50 ` Peter Zijlstra
2009-12-07 8:56 ` Peter Zijlstra
2009-12-07 10:27 ` Tejun Heo
2009-12-08 8:53 ` Peter Zijlstra
2009-12-08 9:16 ` Tejun Heo
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