linux-kernel - Re: [PATCH v4 07/10] x86/sched: Add SD_ASYM

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Date:   Thu, 22 Sep 2016 12:40:59 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...e.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>, jolsa@...hat.com
Subject: Re: [PATCH v4 07/10] x86/sched: Add SD_ASYM_PACKING flags to x86
 ITMT CPU

On Wed, 2016-09-21 at 22:33 +0200, Rafael J. Wysocki wrote:
> On Wed, Sep 21, 2016 at 9:19 PM, Srinivas Pandruvada
> <srinivas.pandruvada@...ux.intel.com> wrote:
> > 
> > From: Tim Chen <tim.c.chen@...ux.intel.com>
> > 
> > Some Intel cores in a package can be boosted to a higher turbo frequency
> > with ITMT 3.0 technology. The scheduler can use the asymmetric packing
> > feature to move tasks to the more capable cores.
> > 
> > If ITMT is enabled, add SD_ASYM_PACKING flag to the thread and core
> > sched domains to enable asymmetric packing.
> > 
> > Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> > ---
> >  arch/x86/kernel/smpboot.c | 27 +++++++++++++++++++++++----
> >  1 file changed, 23 insertions(+), 4 deletions(-)
> > 
> > diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> > index 38901b3..46815e6 100644
> > --- a/arch/x86/kernel/smpboot.c
> > +++ b/arch/x86/kernel/smpboot.c
> > @@ -487,22 +487,41 @@ static bool match_die(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
> >         return false;
> >  }
> > 
> > +#ifndef CONFIG_SCHED_ITMT
> > +#define sysctl_sched_itmt_enabled      0
> > +#endif
> I thought that would be done in the header where
> sysctl_sched_itmt_enabled is declared (along with defining the stubs
> for the sched_set_itmt_* functions).

Sure. I will move it to arch/x86/include/asm/topology.h.

Tim