lkml.org 
[lkml]   [2018]   [Jul]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC] Make need_resched() return true when rcu_urgent_qs requested
On Thu, Jul 19, 2018 at 09:20:33AM +0200, David Woodhouse wrote:
> On Thu, 2018-07-19 at 08:45 +0200, Christian Borntraeger wrote:
> >
> > > My thought would be something like this:
> > > 
> > >       if (context_tracking_cpu_is_enabled())
> > >               rcu_kvm_enter();
> > >       else
> > >               rcu_virt_note_context_switch(smp_processor_id());
> >
> > In the past we needed that (when we introduced that). At least with every
> > host interrupt we called this making an rcu event at least every HZ.
> > Will the changes in need_resched make this part unnecessary?
>
> Yes, the change in need_resched() should make this part unnecessary.
> Unless your architecture's version of the vcpu_run() loop just loops
> forever even when TIF_NEED_RESCHED is set? :)
>
> I'm not sure about the context tracking condition in the code snippet
> cited above, though. I think that's what caused my problem in the first
> place — I have CONTEXT_TRACKING_FORCE && !NO_HZ_FULL. So in 4.15, that
> means rcu_user_enter() did nothing and rcu_virt_note_context_switch()
> wasn't called. Hence the observed stalls.
>
> Should rcu_user_enter() itself be conditional on CONTEXT_TRACKING not
> NO_HZ_FULL? 

Ah, CONTEXT_TRACKING_FORCE is only for testing purpose, you should not select
it, it's going to introduce overhead. Actually I should remove that. Although
since we have removed CONFIG_NOHZ_FULL_ALL it's the last way we have to test
NOHZ_FULL from config alone.

\
 
 \ /
  Last update: 2018-07-19 15:15    [W:0.136 / U:0.344 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site