On 2020/5/14 21:02, Peter Zijlstra wrote:
> On Fri, May 08, 2020 at 08:34:57PM +0800, Aaron Lu wrote:
>> With this said, I realized a workaround for the issue described above:
>> when the core went from 'compatible mode'(step 1-3) to 'incompatible
>> mode'(step 4), reset all root level sched entiti
On Sat, May 16, 2020 at 11:42:30AM +0800, Aaron Lu wrote:
> On Thu, May 14, 2020 at 03:02:48PM +0200, Peter Zijlstra wrote:
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -4476,6 +4473,16 @@ next_class:;
> > WARN_ON_ONCE(!cookie_match(next, rq_i->core_pick));
> >
On Thu, May 14, 2020 at 03:02:48PM +0200, Peter Zijlstra wrote:
> On Fri, May 08, 2020 at 08:34:57PM +0800, Aaron Lu wrote:
> > With this said, I realized a workaround for the issue described above:
> > when the core went from 'compatible mode'(step 1-3) to 'incompatible
> > mode'(step 4), reset al
On Fri, May 15, 2020 at 6:39 AM Peter Zijlstra wrote:
>
> It's complicated ;-)
>
> So this sync is basically a relative reset of S to 0.
>
> So with 2 queues, when one goes idle, we drop them both to 0 and one
> then increases due to not being idle, and the idle one builds up lag to
> get re-elect
On Fri, May 15, 2020 at 12:38:44PM +0200, Peter Zijlstra wrote:
> less := !((s64)(s_a - s_b) <= 0)
>
> (v_a - S_a) - (v_b - S_b) == v_a - v_b - S_a + S_b
> == v_a - (v_b - S_a + S_b)
>
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -469,7 +469,7 @@ b
On Thu, May 14, 2020 at 06:51:27PM -0400, Vineeth Remanan Pillai wrote:
> On Thu, May 14, 2020 at 9:02 AM Peter Zijlstra wrote:
> >
> > A little something like so, this syncs min_vruntime when we switch to
> > single queue mode. This is very much SMT2 only, I got my head in twist
> > when thikning
Hi Peter,
On Thu, May 14, 2020 at 9:02 AM Peter Zijlstra wrote:
>
> A little something like so, this syncs min_vruntime when we switch to
> single queue mode. This is very much SMT2 only, I got my head in twist
> when thikning about more siblings, I'll have to try again later.
>
Thanks for the qu
On Fri, May 08, 2020 at 08:34:57PM +0800, Aaron Lu wrote:
> With this said, I realized a workaround for the issue described above:
> when the core went from 'compatible mode'(step 1-3) to 'incompatible
> mode'(step 4), reset all root level sched entities' vruntime to be the
> same as the core wide
On Fri, May 08, 2020 at 11:09:25AM +0200, Peter Zijlstra wrote:
> On Fri, May 08, 2020 at 04:44:19PM +0800, Aaron Lu wrote:
> > On Wed, May 06, 2020 at 04:35:06PM +0200, Peter Zijlstra wrote:
>
> > > Aside from this being way to complicated for what it does -- you
> > > could've saved the min_vrun
On Fri, May 08, 2020 at 04:44:19PM +0800, Aaron Lu wrote:
> On Wed, May 06, 2020 at 04:35:06PM +0200, Peter Zijlstra wrote:
> > Aside from this being way to complicated for what it does -- you
> > could've saved the min_vruntime for each rq and compared them with
> > subtraction -- it is also term
On Wed, May 06, 2020 at 04:35:06PM +0200, Peter Zijlstra wrote:
>
> Sorry for being verbose; I've been procrastinating replying, and in
> doing so the things I wanted to say kept growing.
>
> On Fri, Apr 24, 2020 at 10:24:43PM +0800, Aaron Lu wrote:
>
> > To make this work, the root level sched
Sorry for being verbose; I've been procrastinating replying, and in
doing so the things I wanted to say kept growing.
On Fri, Apr 24, 2020 at 10:24:43PM +0800, Aaron Lu wrote:
> To make this work, the root level sched entities' vruntime of the two
> threads must be directly comparable. So one o
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