lkml.org 
[lkml]   [2015]   [Jun]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC][PATCH 1/7] sched: Replace post_schedule with a balance callback list
From
Date
Hi Peter,

This may increase the overhead of schedule() a bit, as it will have
more work to do.

check_class_changed():
if (prev_class->switched_from)
prev_class->switched_from(rq, p);
/* Possble rq->lock 'hole'. */
p->sched_class->switched_to(rq, p);

For above cases, why can't we just add a judgement in switched_to_fair()
as follows:
if (rq != task_rq(p))
return;

switched_to_rt() and switched_to_dl() already did the similar judgement.

Then the following operation is usually task_rq_unlock() or the like,
seems no other harm with the old rq of p.

-Xunlei

Peter Zijlstra <peterz@infradead.org> wrote 2015-06-01 PM 09:58:19:
> [RFC][PATCH 1/7] sched: Replace post_schedule with a balance callback
list
>
> Generalize the post_schedule() stuff into a balance callback list.
> This allows us to more easily use it outside of schedule() and cross
> sched_class.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

--------------------------------------------------------
ZTE Information Security Notice: The information contained in this mail (and any attachment transmitted herewith) is privileged and confidential and is intended for the exclusive use of the addressee(s). If you are not an intended recipient, any disclosure, reproduction, distribution or other dissemination or use of the information contained is strictly prohibited. If you have received this mail in error, please delete it and notify us immediately.


\
 
 \ /
  Last update: 2015-06-03 11:21    [W:0.229 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site