lkml.org 
[lkml]   [2008]   [Jun]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Stop machine threads are getting preemted by the rt period enforcement
From
Date
On Wed, 2008-06-04 at 11:24 -0700, Max Krasnyansky wrote:
>
> Peter Zijlstra wrote:
> > On Wed, 2008-06-04 at 11:07 -0700, Max Krasnyansky wrote:
> >> Peter, Ingo,
> >>
> >> Take a look at the report below (came up during isolcpu= remove discussions).
> >>
> >> It looks like stop_machine threads are getting forcefully preempted because
> >> they exceed their RT quanta. It's strange because rt period is pretty long.
> >> But given that disabling rt period logic solves the issue the machine was not
> >> really stuck.
> >
> > Yeah, I know, I'm already looking at this
>
> I see. Does it look like a bug in the rt period logic ?
> Or did the stop_machine thread really run for a long time (in the report that
> you got that is) ?

looks like a fun race between refreshing the period and updating
cpu_online_map.





\
 
 \ /
  Last update: 2008-06-04 20:59    [W:0.615 / U:0.228 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site