lkml.org 
[lkml]   [2012]   [Jun]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads
On Thu, 14 Jun 2012, Paul E. McKenney wrote:

> On Thu, Jun 14, 2012 at 04:56:29PM +0200, Peter Zijlstra wrote:
> > On Thu, 2012-06-14 at 07:47 -0700, Paul E. McKenney wrote:
> > > RCU callback processing consumes the entire CPU in RCU_BOOST case where
> > > processing runs at real-time priority. This is analogous to RT throttling
> > > in the scheduler.
> >
> > But previously we can in non-preemptible softirq context, why would if
> > behave differently when done from a RT task?
>
> In -rt, yes, but in mainline, ksoftirqd does not run at RT prio, right?
>
> > Also, no its not quite like the throttling, that really idles the cpu
> > even if there's no SCHED_OTHER tasks to run.
>
> Agreed, not -exactly- like throttling, but it has a broadly similar
> goal, namely to prevent a given type of processing from starving
> everything else in the system.
>
> That said, why does throttling idle the CPU even if there is no other
> SCHED_OTHER tasks to run?

For simplicity reasons :)

Thanks,

tglx


\
 
 \ /
  Last update: 2012-06-14 19:01    [W:0.044 / U:0.324 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site