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From: Dario Faggioli <dario.faggioli@citrix.com>
To: George Dunlap <dunlapg@umich.edu>
Cc: xen-devel <xen-devel@lists.xenproject.org>,
	Justin Weaver <jtweaver@hawaii.edu>
Subject: Re: [PATCH 16/16] xen: sched: implement vcpu hard affinity in Credit2
Date: Tue, 5 Apr 2016 18:50:23 +0200	[thread overview]
Message-ID: <1459875023.3166.59.camel@citrix.com> (raw)
In-Reply-To: <CAFLBxZbfDm9ZDm5oADMvEhJrsmTJqkSoF4pykLVarVhD9pjp8w@mail.gmail.com>


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On Thu, 2016-03-24 at 15:42 +0000, George Dunlap wrote:
> On Fri, Mar 18, 2016 at 7:06 PM, Dario Faggioli
> <dario.faggioli@citrix.com> wrote:
> > 
> > From: Justin Weaver <jtweaver@hawaii.edu>
> > 
> > Signed-off-by: Justin Weaver <jtweaver@hawaii.edu>
> > Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
> Just checking, are the main changes between this patch and the v4
> that
> Justin posted:
> 
> 1) Moving the "scratch_mask" to a different patch
> 2) The code-cleanups you listed?
> 
Yes, indeed! Sorry for not pointing that out more clearly (e.g., in the
cover letter).

> One rather tangential question...

> > --- a/xen/common/sched_credit2.c
> > +++ b/xen/common/sched_credit2.c
> > @@ -560,8 +590,9 @@ runq_tickle(const struct scheduler *ops,
> > unsigned int cpu, struct csched2_vcpu *
> >          goto tickle;
> >      }
> > 
> > -    /* Get a mask of idle, but not tickled */
> > +    /* Get a mask of idle, but not tickled, that new is allowed to
> > run on. */
> >      cpumask_andnot(&mask, &rqd->idle, &rqd->tickled);
> > +    cpumask_and(&mask, &mask, new->vcpu->cpu_hard_affinity);
> It looks like this uses a cpumask_t on the stack -- can we use
> scratch_mask here, or is there some reason we need to use the local
> variable?
> 
> But that's really something to either add to the previous patch, or
> to
> do in yet a different patch.
> 
It's because that cpumask stack variable is there already, and the
primary purpose of the scratch mask is to avoid _adding_more_ of them.
This is how it has been introduced and used so far in Credit1 and RTDS.

That said, I do agree it can well be used to get rid of some of the
already existing stack variable, but, as you suggest yourself, I'm
thinking about doing this in another patch.

> Acked-by: George Dunlap <george.dunlap@citrix.com>
>
Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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      reply	other threads:[~2016-04-05 16:53 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-18 19:03 [PATCH 00/16] Fixes and improvement (including hard affinity!) for Credit2 Dario Faggioli
2016-03-18 19:04 ` [PATCH 01/16] xen: sched: fix locking when allocating an RTDS pCPU Dario Faggioli
2016-03-19  2:22   ` Meng Xu
2016-03-23 15:37   ` George Dunlap
2016-03-18 19:04 ` [PATCH 02/16] xen: sched: add .init_pdata hook to the scheduler interface Dario Faggioli
2016-03-22  8:08   ` Juergen Gross
2016-03-23 17:32   ` George Dunlap
2016-03-18 19:04 ` [PATCH 03/16] xen: sched: make implementing .alloc_pdata optional Dario Faggioli
2016-03-19  2:23   ` Meng Xu
2016-03-21 14:22   ` Jan Beulich
2016-03-23 17:36     ` George Dunlap
2016-03-24  9:43       ` Jan Beulich
2016-03-24 13:14         ` Dario Faggioli
2016-03-21 14:48   ` Juergen Gross
2016-03-21 15:07     ` Jan Beulich
2016-04-01 17:01       ` Dario Faggioli
2016-04-04  4:21         ` Juergen Gross
2016-04-04  6:13         ` Jan Beulich
2016-04-05 16:01           ` Dario Faggioli
2016-03-23 17:38   ` George Dunlap
2016-03-18 19:04 ` [PATCH 04/16] xen: sched: implement .init_pdata in all schedulers Dario Faggioli
2016-03-19  2:24   ` Meng Xu
2016-03-22  8:03   ` Juergen Gross
2016-03-23 17:46     ` George Dunlap
2016-03-18 19:04 ` [PATCH 05/16] xen: sched: move pCPU initialization in an helper Dario Faggioli
2016-03-23 17:51   ` George Dunlap
2016-03-23 18:09     ` George Dunlap
2016-03-24 13:21     ` Dario Faggioli
2016-03-18 19:04 ` [PATCH 06/16] xen: sched: prepare a .switch_sched hook for Credit1 Dario Faggioli
2016-03-18 19:04 ` [PATCH 07/16] xen: sched: prepare a .switch_sched hook for Credit2 Dario Faggioli
2016-03-18 19:04 ` [PATCH 08/16] " Dario Faggioli
2016-03-19  2:24   ` Meng Xu
2016-03-21 14:25   ` Jan Beulich
2016-03-18 19:05 ` [PATCH 09/16] xen: sched: close potential races when switching scheduler to CPUs Dario Faggioli
2016-03-19  2:25   ` Meng Xu
2016-03-23 19:05   ` George Dunlap
2016-04-05 16:26     ` Dario Faggioli
2016-04-06 15:51       ` Dario Faggioli
2016-03-24 12:14   ` George Dunlap
2016-04-05 17:37     ` Dario Faggioli
2016-04-06 16:21       ` Dario Faggioli
2016-03-18 19:05 ` [PATCH 10/16] xen: sched: improve credit2 bootparams' scope, placement and signedness Dario Faggioli
2016-03-21 14:51   ` Juergen Gross
2016-03-24 12:20   ` George Dunlap
2016-03-18 19:05 ` [PATCH 11/16] xen: sched: on Credit2, don't reprogram the timer if idle Dario Faggioli
2016-03-24 15:03   ` George Dunlap
2016-03-18 19:05 ` [PATCH 12/16] xen: sched: fix per-socket runqueue creation in credit2 Dario Faggioli
2016-03-24 12:24   ` George Dunlap
2016-03-18 19:05 ` [PATCH 13/16] xen: sched: allow for choosing credit2 runqueues configuration at boot Dario Faggioli
2016-03-22  7:46   ` Juergen Gross
2016-03-24 12:36   ` George Dunlap
2016-03-18 19:05 ` [PATCH 14/16] xen: sched: per-core runqueues as default in credit2 Dario Faggioli
2016-03-24 12:37   ` George Dunlap
2016-03-18 19:06 ` [PATCH 15/16] xen: sched: scratch space for cpumasks on Credit2 Dario Faggioli
2016-03-18 19:27   ` Andrew Cooper
2016-03-24 12:44     ` George Dunlap
2016-03-24 12:56       ` Andrew Cooper
2016-03-24 13:10       ` Dario Faggioli
2016-03-18 19:06 ` [PATCH 16/16] xen: sched: implement vcpu hard affinity in Credit2 Dario Faggioli
2016-03-24 15:42   ` George Dunlap
2016-04-05 16:50     ` Dario Faggioli [this message]

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