From: Kirill Tkhai <tkhai@yandex.ru>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH]sched_rt.c: Avoid unnecessary dequeue and enqueue of pushable tasks in set_cpus_allowed_rt()
Date: Sat, 17 Mar 2012 03:58:44 +0400 [thread overview]
Message-ID: <654301331942324@web109.yandex.ru> (raw)
In-Reply-To: <944171329661049@web81.yandex.ru>
Steven, what is about the patch from my previous message? Is everything ok?
Regards,
Kirill
19.02.2012, 18:17, "Kirill Tkhai" <tkhai@yandex.ru>:
> 13.02.2012, 21:23, "Steven Rostedt" <rostedt@goodmis.org>:
>
>> I wasn't on the Cc of the original message, but it was bounced to me
>> awhile ago. I'm cleaning out my email and came across it.
>>
>> Can you send me the latest version of this patch, either against latest
>> Linus, or against tip/master.
>>
>> Thanks,
>>
>> -- Steve
>>
>> P.S. I'll be at ELC this week so it may not get processed right away.
>
> Migration status depends on a difference of weight from 0 and 1.
> If weight > 1 (<= 1) and old weight <= 1 (> 1) then task becomes
> pushable (or not pushable). We are not insterested in its exact
> values, is it 3 or 4, for example.
>
> Now if we are changing affinity from a set of 3 cpus to a set of 4, the-
> task will be dequeued and enqueued sequentially without important
> difference in comparison with initial state. The only difference is in
> internal representation of plist queue of pushable tasks and the fact
> that the task may won't be the first in a sequence of the same priority
> tasks. But it seems to me it gives nothing.
>
> Signed-off-by: Tkhai Kirill <tkhai@yandex.ru>
next prev parent reply other threads:[~2012-03-16 23:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-01 21:26 [PATCH]sched_rt.c: Avoid unnecessary dequeue and enqueue of pushable tasks in set_cpus_allowed_rt() Kirill Tkhai
2011-12-20 17:44 ` Oleg Nesterov
2011-12-20 20:28 ` Tkhai Kirill
2011-12-20 21:09 ` Tkhai Kirill
2012-02-13 17:23 ` Steven Rostedt
2012-02-19 14:17 ` Kirill Tkhai
2012-03-16 23:58 ` Kirill Tkhai [this message]
2012-04-10 13:58 ` Steven Rostedt
2012-04-10 15:52 ` Steven Rostedt
2012-04-11 5:06 ` Kirill Tkhai
2012-04-14 18:22 ` [tip:sched/core] sched_rt: Avoid unnecessary dequeue and enqueue of pushable tasks in set_cpus_allowed_rt () tip-bot for Kirill Tkhai
-- strict thread matches above, loose matches on Subject: below --
2012-01-11 19:10 [PATCH] sched_rt.c: Avoid unnecessary dequeue and enqueue of pushable tasks in set_cpus_allowed_rt() Kirill Tkhai
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