linux-kernel - Re: [PATCH v3 1/4] perf: Add a 'percore' event qualifier

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Date:   Wed, 10 Apr 2019 22:15:36 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3 1/4] perf: Add a 'percore' event qualifier



On 4/10/2019 8:54 PM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Apr 10, 2019 at 09:36:41AM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Tue, Mar 19, 2019 at 04:56:53PM +0800, Jin Yao escreveu:
>>> Add a 'percore' event qualifier, like cpu/event=0,umask=0x3,percore=1/,
>>> that sums up the event counts for both hardware threads in a core.
>>>
>>> We can already do this with --per-core, but it's often useful to do
>>> this together with other metrics that are collected per hardware thread.
>>> So we need to support this per-core counting on a event level.
>>>
>>> This can be implemented in only the user tool, no kernel support needed.
>>>
>>>   v3:
>>>   ---
>>>   Simplify the code according to Jiri's comments.
>>>   Before:
>>>     "return term->val.percore ? true : false;"
>>>   Now:
>>>     "return term->val.percore;"
>>>
>>>   v2:
>>>   ---
>>>   Change the qualifier name from 'coresum' to 'percore' according to
>>>   comments from Jiri and Andi.
>>
>> I'm applying this, but please, don't forget to, when adding a new
>> qualifier, to update the documentation... I'm doing this for you this
>> time.
> 
> The first patch didn't apply with 'git am', I did it manually, and added
> the patch below
> 
> But then the second doesn't apply to my perf/core branch as well, please
> refresh and resend a v4, thanks.
> 
> - Arnaldo
> 

Thanks Arnaldo! I will rebase the patch to latest perf/core branch and 
then send v4.

Thanks
Jin Yao

> diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
> index 138fb6e94b3c..18ed1b0fceb3 100644
> --- a/tools/perf/Documentation/perf-list.txt
> +++ b/tools/perf/Documentation/perf-list.txt
> @@ -199,6 +199,18 @@ also be supplied. For example:
>   
>     perf stat -C 0 -e 'hv_gpci/dtbp_ptitc,phys_processor_idx=0x2/' ...
>   
> +EVENT QUALIFIERS:
> +
> +It is also possible to add extra qualifiers to an event:
> +
> +percore:
> +
> +Sums up the event counts for all hardware threads in a core, e.g.:
> +
> +
> +  perf stat -e cpu/event=0,umask=0x3,percore=1/
> +
> +
>   EVENT GROUPS
>   ------------
>   
>