linux-kernel - Re: [PATCH v4 0/7] Event parsing fixes

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Message-ID: <Zs6yrwmn-rJWWaCr@tassilo>
Date: Tue, 27 Aug 2024 22:16:31 -0700
From: Andi Kleen <ak@...ux.intel.com>
To: James Clark <james.clark@...aro.org>
Cc: irogers@...gle.com, linux-perf-users@...r.kernel.org,
	John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
	Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Weilin Wang <weilin.wang@...el.com>,
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Yang Jihong <yangjihong@...edance.com>,
	Colin Ian King <colin.i.king@...il.com>,
	Ze Gao <zegao2021@...il.com>,
	Jing Zhang <renyu.zj@...ux.alibaba.com>,
	Sun Haiyong <sunhaiyong@...ngson.cn>,
	Yicong Yang <yangyicong@...ilicon.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/7] Event parsing fixes

> There is one small difference where it now shows "stalled-cycles-..."
> as <not supported> events, when before it just didn't show them at all when
> they weren't supported:
> 
>   $ perf stat -- true
> 
>   Performance counter stats for 'true':
> 
>               0.66 msec task-clock                       #    0.384 CPUs utilized             
>                  0      context-switches                 #    0.000 /sec                      
>                  0      cpu-migrations                   #    0.000 /sec                      
>                 52      page-faults                      #   78.999 K/sec                     
>      <not counted>      cpu_atom/instructions/                                                  (0.00%)
>            978,399      cpu_core/instructions/           #    1.02  insn per cycle            
>      <not counted>      cpu_atom/cycles/                                                        (0.00%)
>            959,722      cpu_core/cycles/                 #    1.458 GHz                       
>    <not supported>      cpu_atom/stalled-cycles-frontend/                                      
>    <not supported>      cpu_core/stalled-cycles-frontend/                                      
> 
> I don't think that's a big deal though and could probably be fixed up
> later if we really want to.

I would prefer if that was fixed up. That's quite ugly for the default
view on x86/Intel.

-Andi