linux-kernel - Re: [PATCH v3 3/5] perf stat: Remove evlist__add_default

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Message-ID: <35d6875b-9a28-4953-a187-b6659880ac66@arm.com>
Date: Wed, 29 May 2024 16:39:27 +0100
From: James Clark <james.clark@....com>
To: Ian Rogers <irogers@...gle.com>
Cc: 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>,
 Kan Liang <kan.liang@...ux.intel.com>, Ravi Bangoria
 <ravi.bangoria@....com>, Yang Jihong <yangjihong@...edance.com>,
 Ze Gao <zegao2021@...il.com>, Leo Yan <leo.yan@...ux.dev>,
 Song Liu <song@...nel.org>, K Prateek Nayak <kprateek.nayak@....com>,
 Kaige Ye <ye@...ge.org>, Yicong Yang <yangyicong@...ilicon.com>,
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/5] perf stat: Remove evlist__add_default_attrs use
 strings



On 10/05/2024 06:37, Ian Rogers wrote:
> add_default_atttributes would add evsels by having pre-created
> perf_event_attr, however, this needed fixing for hybrid as the
> extended PMU type was necessary for each core PMU. The logic for this
> was in an arch specific x86 function and wasn't present for ARM,
> meaning that default events weren't being opened on all PMUs on
> ARM. Change the creation of the default events to use parse_events and
> strings as that will open the events on all PMUs.
> 
> Rather than try to detect events on PMUs before parsing, parse the
> event but skip its output in stat-display.
> 
> The previous order of hardware events was: cycles,
> stalled-cycles-frontend, stalled-cycles-backend, instructions. As
> instructions is a more fundamental concept the order is changed to:
> instructions, cycles, stalled-cycles-frontend, stalled-cycles-backend.
> 
> Closes: https://lore.kernel.org/lkml/CAP-5=fVABSBZnsmtRn1uF-k-G1GWM-L5SgiinhPTfHbQsKXb_g@mail.gmail.com/

Taking a look at this one now. I think some example commands and outputs
in the commit message would be helpful because there are quite a few
different things mentioned in the closes link.

But I'm assuming this is just for the command without specifying an event:

  $ perf stat

I didn't realise that wasn't working properly and I'd missed that Mark
spotted it in that link.