linux-kernel - Re: [PATCH] perf stat: Show percore counts in per CPU output

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Message-ID: <d1eb5ce7-8c2c-3f15-5218-67de334897a6@linux.intel.com>
Date:   Tue, 11 Feb 2020 09:48:58 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, kan.liang@...el.com,
        yao.jin@...el.com
Subject: Re: [PATCH] perf stat: Show percore counts in per CPU output



On 2/11/2020 5:04 AM, Jiri Olsa wrote:
> On Mon, Feb 10, 2020 at 09:01:59AM -0800, Andi Kleen wrote:
>>>> With --percore-show-thread, CPU0 and CPU4 have the same counts (CPU0 and
>>>> CPU4 are siblings, e.g. 2,453,061 in my example). The value is sum of CPU0 +
>>>> CPU4.
>>>
>>> so it shows percore stats but displays all the cpus? what is this good for?
>>
>> This is essentially a replacement for the any bit (which is gone in Icelake).
>> Per core counts are useful for some formulas, e.g. CoreIPC
>>
>> The original percore version was inconvenient to post process. This
>> variant matches the output of the any bit.
> 
> I see, please put this to the changelog/doc
> 
> thanks,
> jirka
> 

Thanks Jiri, thanks Andi!

I will put the explanation in v2.

Thanks
Jin Yao