linux-kernel - Re: [PATCH V5 2/8] perf/x86: Add PERF_X86_EVENT_NEEDS_BRANCH

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Date:   Thu, 9 Nov 2023 14:07:04 -0500
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
        ak@...ux.intel.com, eranian@...gle.com,
        alexey.v.bayduraev@...ux.intel.com, tinghao.zhang@...el.com
Subject: Re: [PATCH V5 2/8] perf/x86: Add PERF_X86_EVENT_NEEDS_BRANCH_STACK
 flag



On 2023-11-09 1:46 p.m., Arnaldo Carvalho de Melo wrote:
> Em Thu, Nov 09, 2023 at 12:05:27PM -0500, Liang, Kan escreveu:
>> On 2023-11-09 11:45 a.m., Arnaldo Carvalho de Melo wrote:
>>> Em Thu, Nov 09, 2023 at 11:14:31AM -0500, Liang, Kan escreveu:
>>>> The below change should fix it. I will post a complete patch shortly.
> 
>>> Thanks for the quick response, if all that is needed are the checks
>>> below, I'll fold it into your original patch:
> 
>>> 2ae01908298426e4 perf tools: Add branch counter knob
> 
>>> So that we don't regress, ok?
> 
>> Sure.
> 
>> I also post the patch to
>> https://lore.kernel.org/lkml/20231109164007.2037721-1-kan.liang@linux.intel.com/
>> Either folding it or using the new patch is fine for me.
> 
> I folded it, retested, pushed out perf-tools-next.

Thanks!

>  
>> BTW: the new perf test case for the feature is posted here.
>> I think Ian is reviewing it.
>> https://lore.kernel.org/lkml/20231107184020.1497571-1-kan.liang@linux.intel.com/
> 
> Ok, lets wait some more.
> 
> Hey, what is SFR/GRR? Sapphire Rapids/Granite Rapids? I thought about
> testing this somehow, if possible.
> 

Sierra Forest/Grand Ridge. The feature is only available on the E-core
based server for now.

Thanks,
Kan