linux-kernel - Re: [PATCH v3 1/8] sched, x86: Add SD_ASYM_PACKING flags to x86 cpu topology for ITMT

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Date:   Mon, 12 Sep 2016 13:50:15 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     rjw@...ysocki.net, mingo@...hat.com, bp@...e.de, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, peterz@...radead.org
Subject: Re: [PATCH v3 1/8] sched, x86: Add SD_ASYM_PACKING flags to x86 cpu
 topology for ITMT

On Sat, 2016-09-10 at 15:10 +0200, Thomas Gleixner wrote:
> On Thu, 8 Sep 2016, Srinivas Pandruvada wrote:
> > 
> > From: Tim Chen <tim.c.chen@...ux.intel.com>
> > 
> > We uses ASYM_PACKING feature in the scheduler to move tasks to more
> > capable cpus that can be boosted to higher frequency. This is enabled by
> > Intel Turbo Boost Max Technology 3.0 (ITMT).  We mark the sched domain
> > topology level with SD_ASYM_PACKING flag for such systems to indicate
> > scheduler can use the ASYM_PACKING feature to move load to the
> > more capable cpus.
> Sigh. This changelog does not tell anything about the nature of the patch,
> the rationale for it etc. It's just a meaningless blurb.

Okay, I can add more details about ITMT.  Will also be clearer if
the ITMT patch (patch 5) comes before this one.



> > +}
> > +#else
> > +#define x86_core_flags cpu_core_flags
> > +#define x86_smt_flags cpu_smt_flags
> > +#endif
> No. We first rework the code so that the IMT stuff can be added in a later
> patch easily.

I'll move this patch to come after current patch 5.

Thanks.

Tim