linux-kernel - Re: [PATCH 2/2] tools/power/x86/intel-speed-select: Display core count for bucket

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Message-ID: <20190906134655.GU2680@smile.fi.intel.com>
Date:   Fri, 6 Sep 2019 16:46:55 +0300
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        darcari@...hat.com, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 2/2] tools/power/x86/intel-speed-select: Display core
 count for bucket

On Fri, Sep 06, 2019 at 05:39:54AM -0400, Prarit Bhargava wrote:
> On 9/5/19 7:37 PM, Srinivas Pandruvada wrote:
> > Read the bucket and core count relationship via MSR and display
> > when displaying turbo ratio limits.

> > +	ret = isst_send_msr_command(cpu, 0x1ae, 0, buckets_info);
> 
> ^^^ you can get rid of the magic number 0x1ae by doing (sorry for the cut-and-paste)
> 
> diff --git a/tools/power/x86/intel-speed-select/Makefile b/tools/power/x86/intel
> index 12c6939dca2a..087d802ad844 100644
> --- a/tools/power/x86/intel-speed-select/Makefile
> +++ b/tools/power/x86/intel-speed-select/Makefile
> @@ -15,6 +15,8 @@ endif
>  MAKEFLAGS += -r
> 
>  override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include

> +override CFLAGS += -I../../../include
> +override CFLAGS += -DMSRHEADER='"../../../../arch/x86/include/asm/msr-index.h"'

I guess it can be done in more neat way.

> As I've been looking at this code I have been wondering why didn't you just use
> the standard /dev/cpu/X/msr interface that other x86 power utilities (turbostat,
> x86_energy_perf_policy) use?  Implementing msr_read() is trivial (warning
> untested and uncompiled code)

Actually good point!

-- 
With Best Regards,
Andy Shevchenko