From: Tejun Heo <tj@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org, x86@kernel.org,
oleg@redhat.com, rusty@rustcorp.com.au, sivanich@sgi.com,
heiko.carstens@de.ibm.com, dipankar@in.ibm.com,
josh@freedesktop.org, paulmck@linux.vnet.ibm.com,
akpm@linux-foundation.org, arjan@linux.intel.com,
torvalds@linux-foundation.org
Subject: Re: [PATCH 3/4] scheduler: replace migration_thread with cpu_stop
Date: Tue, 04 May 2010 14:49:23 +0200 [thread overview]
Message-ID: <4BE017D3.2010203@kernel.org> (raw)
In-Reply-To: <1272977159.5605.171.camel@twins>
On 05/04/2010 02:45 PM, Peter Zijlstra wrote:
>> Hmmm... maybe I'm mistaken but isn't that guaranteed by
>> busiest->active_balance which is protected by the rq lock?
>> active_load_balance_cpu_stop is scheduled iff busiest->active_balance
>> was changed from zero and only active_load_balance_cpu_stop() can
>> clear it at the end of its execution at which point the
>> active_balance_work is safe to reuse.
>
> Ah, indeed. It wasn't obvious from looking at the patch, but when
> looking at the full code it fairly easy to see.
Hmmm... it's probably worthwhile to note tho. I'll add a comment and
send out the updated patches soon.
Thanks.
--
tejun
next prev parent reply other threads:[~2010-05-04 12:50 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-22 16:09 [PATCHSET sched/core] cpu_stop: implement and use cpu_stop Tejun Heo
2010-04-22 16:09 ` [PATCH 1/4] cpu_stop: implement stop_cpu[s]() Tejun Heo
2010-05-03 13:26 ` Peter Zijlstra
2010-05-04 6:36 ` Tejun Heo
2010-05-03 13:26 ` Peter Zijlstra
2010-05-04 6:36 ` Tejun Heo
2010-05-04 7:03 ` Tejun Heo
2010-05-04 8:43 ` Peter Zijlstra
2010-05-03 13:26 ` Peter Zijlstra
2010-05-04 6:40 ` Tejun Heo
2010-05-04 6:55 ` Tejun Heo
2010-04-22 16:09 ` [PATCH 2/4] stop_machine: reimplement using cpu_stop Tejun Heo
2010-04-22 16:09 ` [PATCH 3/4] scheduler: replace migration_thread with cpu_stop Tejun Heo
2010-05-03 13:26 ` Peter Zijlstra
2010-05-04 7:17 ` Tejun Heo
2010-05-04 12:45 ` Peter Zijlstra
2010-05-04 12:49 ` Tejun Heo [this message]
2010-04-22 16:09 ` [PATCH 4/4] scheduler: kill paranoia check in synchronize_sched_expedited() Tejun Heo
-- strict thread matches above, loose matches on Subject: below --
2010-05-04 13:47 [PATCHSET sched/core] cpu_stop: implement and use cpu_stop, take#2 Tejun Heo
2010-05-04 13:47 ` [PATCH 3/4] scheduler: replace migration_thread with cpu_stop Tejun Heo
2010-05-05 1:33 ` Paul E. McKenney
2010-05-05 7:28 ` Tejun Heo
2010-05-05 17:47 ` Paul E. McKenney
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