linux-kernel - Re: [PATCH v5 0/4] Add support for cpu event term

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Message-ID: <CAP-5=fVH=HN0csS6cXLPAYdk7Vn-g8FSdKWkaHcjfYKRA1o1Ag@mail.gmail.com>
Date: Mon, 17 Mar 2025 09:22:43 -0700
From: Ian Rogers <irogers@...gle.com>
To: 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>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Leo Yan <leo.yan@....com>, 
	Yoshihiro Furudera <fj5100bi@...itsu.com>, Weilin Wang <weilin.wang@...el.com>, 
	Andi Kleen <ak@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Dominique Martinet <asmadeus@...ewreck.org>, Yicong Yang <yangyicong@...ilicon.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/4] Add support for cpu event term

On Mon, Feb 10, 2025 at 10:38 AM Ian Rogers <irogers@...gle.com> wrote:
>
> Being able to set the cpu mask per event was discussed in the context
> of a sysfs event.cpus file is discussed here:
> https://lore.kernel.org/lkml/CAP-5=fXXuWchzUK0n5KTH8kamr=DQoEni+bUoo8f-4j8Y+eMBg@mail.gmail.com/
> Ultimately Kan preferred to have multiple PMUs with a cpumask each
> rather than an event.cpus file per event. It is still useful to have
> the cpu event term and so the sysfs part of the original patch series
> is dropped.
>
> v5: Purely a rebase.
> v4: Add the stat-display output change for zero counters Namhyung
>     requested as part of the series:
>     https://lore.kernel.org/lkml/Zvx9VbJWtmkcuSBs@google.com/
>     This skips zero values for CPUs not in the evsel's cpumask rather
>     than the evsel's PMU's cpumask.
> v3: Drop sysfs event.cpus file support patch from series.  Reference
>     to using cpu to modify uncore events is dropped from the commit
>     message. Reference counting issues on the cpumap are addressed.
> v2: Add support for multiple cpu terms on an event that are
>     merged. For example, an event of "l1d-misses/cpu=4,cpu=5/" will
>     now be opened on both CPU 4 and 5 rather than just CPU 4.
>
> Ian Rogers (4):
>   libperf cpumap: Add ability to create CPU from a single CPU number
>   perf stat: Use counter cpumask to skip zero values
>   perf parse-events: Set is_pmu_core for legacy hardware events
>   perf parse-events: Add "cpu" term to set the CPU an event is recorded

Ping.

Thanks,
Ian