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From: Srikar Dronamraju <srikar-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
To: Khalid Aziz <khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
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Subject: Re: [PATCH v3] sched/fair: Add advisory flag for borrowing a timeslice (was: Pre-emption control for userspace)
Date: Tue, 25 Nov 2014 15:42:38 +0530	[thread overview]
Message-ID: <20141125101238.GA19795@linux.vnet.ibm.com> (raw)
In-Reply-To: <1416862595-24513-1-git-send-email-khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>

> 
> - Request to borrow timeslice is not guranteed to be honored.
> - If the task is allowed to borrow, kernel will inform the task
>   of this. When this happens, task must yield the processor as soon
>   as it completes its critical section.
> - If the task fails to yield processor after being allowed to
>   borrow, it is penalized by forcing it to skip its next time slot
>   by the scheduler.
> - Task is charged additional time for the borrowed timeslice as
>   accumulated run time. This pushes it further down in consideration
>   for the next task to run.
> 

Is there a way for us to identify if the lock is contended?
Because it may not be prudent to allow a task to borrow timeslice for a
lock which isnt contended.

-- 
Thanks and Regards
Srikar Dronamraju

  parent reply	other threads:[~2014-11-25 10:12 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-24 20:56 [PATCH v3] sched/fair: Add advisory flag for borrowing a timeslice (was: Pre-emption control for userspace) Khalid Aziz
2014-11-24 22:43 ` Andi Kleen
     [not found]   ` <20141124224302.GL10824-KWJ+5VKanrL29G5dvP0v1laTQe2KTcn/@public.gmane.org>
2014-11-24 23:20     ` Khalid Aziz
2014-11-24 23:35 ` Thomas Gleixner
2014-11-25  2:12   ` Davidlohr Bueso
2014-11-25  4:20   ` Mike Galbraith
     [not found]     ` <1416889208.4335.127.camel-sZ+7a5bGyC/1wTEvPJ5Q0F6hYfS7NtTn@public.gmane.org>
2014-11-25 14:50       ` [PATCH v3] sched/fair: Add advisory flag for borrowing a timeslice Khalid Aziz
2014-11-25 17:46         ` Mike Galbraith
     [not found]           ` <1416937564.3512.15.camel-sZ+7a5bGyC/1wTEvPJ5Q0F6hYfS7NtTn@public.gmane.org>
2014-11-25 19:38             ` Khalid Aziz
2014-11-25 14:45   ` Khalid Aziz
     [not found]     ` <54749617.5030309-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2014-11-25 18:27       ` Davidlohr Bueso
2014-11-25 19:23         ` Khalid Aziz
     [not found]           ` <5474D71E.8070603-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2014-11-25 19:40             ` Davidlohr Bueso
2014-11-25  2:03 ` [PATCH v3] sched/fair: Add advisory flag for borrowing a timeslice (was: Pre-emption control for userspace) Rik van Riel
2014-11-25  6:30   ` Davidlohr Bueso
2014-11-25 13:38     ` Rik van Riel
2014-11-25 14:52   ` [PATCH v3] sched/fair: Add advisory flag for borrowing a timeslice Khalid Aziz
2014-11-25 15:25     ` Rik van Riel
     [not found]       ` <54749F77.50905-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2014-11-25 17:22         ` Khalid Aziz
2014-11-25 17:45           ` Rik van Riel
     [not found] ` <1416862595-24513-1-git-send-email-khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2014-11-25 10:12   ` Srikar Dronamraju [this message]
2014-11-25 14:56     ` Khalid Aziz

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