From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Peter Zijlstra <peterz@infradead.org>,
Vincent Guittot <vincent.guittot@linaro.org>
Cc: Zhang Qiao <zhangqiao22@huawei.com>,
linux-kernel@vger.kernel.org, mingo@redhat.com,
juri.lelli@redhat.com, rostedt@goodmis.org, bsegall@google.com,
mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com,
rkagan@amazon.de
Subject: Re: [PATCH v2] sched/fair: sanitize vruntime of entity being migrated
Date: Tue, 14 Mar 2023 14:37:53 +0100 [thread overview]
Message-ID: <370e4908-eb8a-74d5-b771-8e657c3b6461@arm.com> (raw)
In-Reply-To: <14775160-8202-0bc6-a718-37c7ac1ed1db@arm.com>
On 14/03/2023 14:29, Dietmar Eggemann wrote:
> On 14/03/2023 13:07, Peter Zijlstra wrote:
>> On Tue, Mar 14, 2023 at 08:41:30AM +0100, Vincent Guittot wrote:
[...]
>> So when a task is not running for a long time (our case at hand), then
>> there's two cases:
>>
>> - it wakes up locally and place_entity() gets to reset vruntime;
>> - it wakes up remotely and migrate_task_rq_fair() can reset vruntime.
>>
>> So if we can rely on ENQUEUE_MIGRATED to differentiate between these
>> cases, when wouldn't something like this work?
>
> I guess so. We would avoid rq_clock_task skews or to be forced to pass
> state that migrating se's vruntime is too old.
... just saw Vincent's reply ... I forgot the limitation that we can't
all rq_clock_task() in migrate_task_rq_fair() again.
[...]
next prev parent reply other threads:[~2023-03-14 13:41 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-06 13:24 Zhang Qiao
2023-03-06 13:53 ` Vincent Guittot
2023-03-07 10:26 ` Vincent Guittot
2023-03-07 11:05 ` Zhang Qiao
2023-03-07 13:41 ` Zhang Qiao
2023-03-08 8:01 ` Vincent Guittot
2023-03-08 12:55 ` Vincent Guittot
2023-03-09 8:37 ` Zhang Qiao
2023-03-09 9:09 ` Dietmar Eggemann
2023-03-09 9:30 ` Zhang Qiao
2023-03-09 10:48 ` Vincent Guittot
2023-03-09 14:23 ` Zhang Qiao
2023-03-07 2:16 ` kernel test robot
2023-03-07 12:45 ` Dietmar Eggemann
2023-03-07 14:06 ` Zhang Qiao
2023-03-09 9:43 ` Zhang Qiao
2023-03-08 14:33 ` Chen Yu
2023-03-09 13:05 ` Peter Zijlstra
2023-03-09 13:34 ` Vincent Guittot
2023-03-09 14:28 ` Peter Zijlstra
2023-03-09 14:36 ` Peter Zijlstra
2023-03-09 15:14 ` Vincent Guittot
2023-03-10 14:29 ` Vincent Guittot
2023-03-11 9:57 ` Zhang Qiao
2023-03-13 14:23 ` Vincent Guittot
2023-03-14 11:03 ` Zhang Qiao
2023-03-14 13:26 ` Vincent Guittot
2023-03-14 13:38 ` Zhang Qiao
2023-03-14 13:39 ` Vincent Guittot
2023-03-14 15:32 ` Vincent Guittot
2023-03-15 9:16 ` Zhang Qiao
2023-03-15 15:30 ` Vincent Guittot
2023-03-13 9:06 ` Dietmar Eggemann
2023-03-13 18:17 ` Dietmar Eggemann
2023-03-14 7:41 ` Vincent Guittot
2023-03-14 12:07 ` Peter Zijlstra
2023-03-14 13:24 ` Vincent Guittot
2023-03-14 17:16 ` Peter Zijlstra
2023-03-15 7:18 ` Vincent Guittot
2023-03-15 8:42 ` Vincent Guittot
2023-03-15 10:15 ` Dietmar Eggemann
2023-03-15 10:21 ` Vincent Guittot
2023-03-15 13:35 ` Dietmar Eggemann
2023-03-15 15:32 ` Vincent Guittot
2023-03-14 13:29 ` Dietmar Eggemann
2023-03-14 13:37 ` Dietmar Eggemann [this message]
2023-03-17 16:08 Vincent Guittot
2023-03-18 7:45 ` Zhang Qiao
2023-03-20 12:29 ` Dietmar Eggemann
2023-03-20 13:26 ` Vincent Guittot
2023-03-21 10:02 ` Peter Zijlstra
2023-03-21 10:29 ` Dietmar Eggemann
2023-03-21 10:49 ` Peter Zijlstra
2023-03-21 11:12 ` Vincent Guittot
2023-03-21 11:13 ` Dietmar Eggemann
2023-03-21 12:26 ` Peter Zijlstra
2023-03-21 12:28 ` Peter Zijlstra
2023-03-21 12:38 ` Vincent Guittot
2023-03-24 4:05 ` Chen Yu
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