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Message-ID: <CAKfTPtBLfm5BSd-r+qcdyThixdG282kgQvPVWuVDkV3xKJMiMA@mail.gmail.com> Date: Tue, 24 May 2016 11:10:28 +0200 From: Vincent Guittot <vincent.guittot@...aro.org> To: Morten Rasmussen <morten.rasmussen@....com> Cc: Peter Zijlstra <peterz@...radead.org>, "mingo@...hat.com" <mingo@...hat.com>, Dietmar Eggemann <dietmar.eggemann@....com>, Yuyang Du <yuyang.du@...el.com>, mgalbraith@...e.de, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 06/16] sched: Disable WAKE_AFFINE for asymmetric configurations On 23 May 2016 at 12:58, Morten Rasmussen <morten.rasmussen@....com> wrote: > If the system has cpu of different compute capacities (e.g. big.LITTLE) > let affine wakeups be constrained to cpus of the same type. Can you explain why you don't want wake affine with cpus with different compute capacity ? > > cc: Ingo Molnar <mingo@...hat.com> > cc: Peter Zijlstra <peterz@...radead.org> > > Signed-off-by: Morten Rasmussen <morten.rasmussen@....com> > --- > kernel/sched/core.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/kernel/sched/core.c b/kernel/sched/core.c > index d9619a3..558ec4a 100644 > --- a/kernel/sched/core.c > +++ b/kernel/sched/core.c > @@ -6410,6 +6410,9 @@ sd_init(struct sched_domain_topology_level *tl, int cpu) > sd->idle_idx = 1; > } > > + if (sd->flags & SD_ASYM_CPUCAPACITY) > + sd->flags &= ~SD_WAKE_AFFINE; > + > sd->private = &tl->data; > > return sd; > -- > 1.9.1 >
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