linux-kernel - Re: [PATCH v4 0/6] Assume sysfs event names are always the same case

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Date: Thu, 2 May 2024 14:15:54 -0400
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Ian Rogers <irogers@...gle.com>, Thomas Richter <tmricht@...ux.ibm.com>,
 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>, Bjorn Helgaas <bhelgaas@...gle.com>,
 Jonathan Corbet <corbet@....net>, Randy Dunlap <rdunlap@...radead.org>,
 Jing Zhang <renyu.zj@...ux.alibaba.com>, James Clark <james.clark@....com>,
 Ravi Bangoria <ravi.bangoria@....com>, linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v4 0/6] Assume sysfs event names are always the same case



On 2024-05-02 12:01 a.m., Ian Rogers wrote:
> By assuming sysfs events are either upper or lower case, the case
> insensitive event parsing can probe for the existence of files rather
> then loading all events in a directory. When the event is a json event
> like inst_retired.any on Intel, this reduces the number of openat
> calls on a Tigerlake laptop from 325 down to 255.
> 
> v1 sent as an RFC:
>     https://lore.kernel.org/lkml/20240413040812.4042051-1-irogers@google.com/
> 
> v2: addresses review feedback from Kan Liang, by updating
>     documentation and adding tests.
> 
> v3: incorporate feedback from Thomas Richter <tmricht@...ux.ibm.com>
>     that s390 event names are all upper case. Do a lower case probe
>     then an upper case probe, make documentation and tests also agree.
> 
> v4: add checks to write (kernel test robot) and fix a typo.
> 
> Ian Rogers (6):
>   perf test pmu-events: Make it clearer that pmu-events tests json
>     events
>   perf Document: Sysfs event names must be lower or upper case
>   perf test pmu: Refactor format test and exposed test APIs
>   perf test pmu: Add an eagerly loaded event test
>   perf test pmu: Test all sysfs PMU event names are the same case
>   perf pmu: Assume sysfs events are always the same case
> 
>  .../sysfs-bus-event_source-devices-events     |   6 +
>  tools/perf/tests/pmu-events.c                 |   2 +-
>  tools/perf/tests/pmu.c                        | 468 ++++++++++++------
>  tools/perf/util/parse-events.c                |   2 +-
>  tools/perf/util/parse-events.h                |   2 +-
>  tools/perf/util/pmu.c                         | 111 +++--
>  tools/perf/util/pmu.h                         |   4 +-
>  tools/perf/util/pmus.c                        |  16 +-
>  tools/perf/util/pmus.h                        |   2 +
>  9 files changed, 416 insertions(+), 197 deletions(-)
> 

Except the warning for the uninitialized 'ret', the rest looks good to me.

Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>

Thanks,
Kan