lkml.org 
[lkml]   [2020]   [Oct]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 1/2] nohz: only wakeup a single target cpu when kicking a task
On Tue, Oct 20, 2020 at 03:52:45PM -0300, Marcelo Tosatti wrote:
> On Thu, Oct 15, 2020 at 01:40:53AM +0200, Frederic Weisbecker wrote:
> > Alternatively, we could rely on p->on_rq which is set to TASK_ON_RQ_QUEUED
> > at wake up time, prior to the schedule() full barrier. Of course that doesn't
> > mean that the task is actually the one running on the CPU but it's a good sign,
> > considering that we are running in nohz_full mode and it's usually optimized
> > for single task mode.
>
> Unfortunately that would require exporting p->on_rq which is internal to
> the scheduler, locklessly.
>
> (can surely do that if you prefer!)

May be:

bool task_on_rq(struct task_struct *p) ?

Thanks.

\
 
 \ /
  Last update: 2020-10-22 14:55    [W:0.111 / U:0.192 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site