linux-kernel - Re: [PATCH v2 00/13] Tool and hwmon PMUs

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Message-ID: <Zvbp3YCQLNBVWFmD@google.com>
Date: Fri, 27 Sep 2024 10:22:37 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...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>,
	John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
	James Clark <james.clark@...aro.org>,
	Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>,
	Ravi Bangoria <ravi.bangoria@....com>,
	Weilin Wang <weilin.wang@...el.com>,
	Jing Zhang <renyu.zj@...ux.alibaba.com>,
	Xu Yang <xu.yang_2@....com>, Sandipan Das <sandipan.das@....com>,
	Benjamin Gray <bgray@...ux.ibm.com>,
	Athira Jajeev <atrajeev@...ux.vnet.ibm.com>,
	Howard Chu <howardchu95@...il.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Yang Jihong <yangjihong@...edance.com>,
	Colin Ian King <colin.i.king@...il.com>,
	Veronika Molnarova <vmolnaro@...hat.com>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Changbin Du <changbin.du@...wei.com>, Ze Gao <zegao2021@...il.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Clément Le Goffic <clement.legoffic@...s.st.com>,
	Sun Haiyong <sunhaiyong@...ngson.cn>,
	Junhao He <hejunhao3@...wei.com>,
	Tiezhu Yang <yangtiezhu@...ngson.cn>,
	Yicong Yang <yangyicong@...ilicon.com>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 00/13] Tool and hwmon PMUs

On Thu, Sep 26, 2024 at 12:47:26PM -0700, Ian Rogers wrote:
> On Fri, Sep 13, 2024 at 7:34 AM Ian Rogers <irogers@...gle.com> wrote:
> >
> > On Thu, Sep 12, 2024 at 3:50 PM Namhyung Kim <namhyung@...nel.org> wrote:
> > >
> > > On Thu, Sep 12, 2024 at 12:03:27PM -0700, Ian Rogers wrote:
> > > > Rather than have fake and tool PMUs being special flags in an evsel,
> > > > create special PMUs. This allows, for example, duration_time to also
> > > > be tool/duration_time/. Once adding events to the tools PMU is just
> > > > adding to an array, add events for nearly all the expr literals like
> > > > num_cpus_online. Rather than create custom logic for finding and
> > > > describing the tool events use json and add a notion of common json
> > > > for the tool events.
> > > >
> > > > Following the convention of the tool PMU, create a hwmon PMU that
> > > > exposes hwmon data for reading. For example, the following shows
> > > > reading the CPU temperature and 2 fan speeds alongside the uncore
> > > > frequency:
> > > > ```
> > > > $ perf stat -e temp_cpu,fan1,hwmon_thinkpad/fan2/,tool/num_cpus_online/ -M UNCORE_FREQ -I 1000
> > > >      1.001153138              52.00 'C   temp_cpu
> > > >      1.001153138              2,588 rpm  fan1
> > > >      1.001153138              2,482 rpm  hwmon_thinkpad/fan2/
> > > >      1.001153138                  8      tool/num_cpus_online/
> > > >      1.001153138      1,077,101,397      UNC_CLOCK.SOCKET                 #     1.08 UNCORE_FREQ
> > > >      1.001153138      1,012,773,595      duration_time
> > > > ...
> > > > ```
> > > >
> > > > Additional data on the hwmon events is in perf list:
> > > > ```
> > > > $ perf list
> > > > ...
> > > > hwmon:
> > > > ...
> > > >   temp_core_0 OR temp2
> > > >        [Temperature in unit coretemp named Core 0. crit=100'C,max=100'C crit_alarm=0'C. Unit:
> > > >         hwmon_coretemp]
> > > > ...
> > > > ```
> > > >
> > > > v2: Address Namhyung's review feedback. Rebase dropping 4 patches
> > > >     applied by Arnaldo, fix build breakage reported by Arnaldo.
> > > >
> > > > Ian Rogers (13):
> > > >   perf pmu: Simplify an asprintf error message
> > > >   perf pmu: Allow hardcoded terms to be applied to attributes
> > > >   perf parse-events: Expose/rename config_term_name
> > > >   perf tool_pmu: Factor tool events into their own PMU
> > > >   perf tool_pmu: Rename enum perf_tool_event to tool_pmu_event
> > > >   perf tool_pmu: Rename perf_tool_event__* to tool_pmu__*
> > > >   perf tool_pmu: Move expr literals to tool_pmu
> > > >   perf jevents: Add tool event json under a common architecture
> > > >   perf tool_pmu: Switch to standard pmu functions and json descriptions
> > > >   perf tests: Add tool PMU test
> > > >   perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs
> > > >   perf test: Add hwmon "PMU" test
> > > >   perf docs: Document tool and hwmon events
> > >
> > > For patch 1-10,
> > >
> > > Acked-by: Namhyung Kim <namhyung@...nel.org>
> 
> I thought the plan was for 1 to 10 to be in v6.12 and the remaining 3
> to be in perf-tools-next/v6.13. I'm not seeing any of the series in
> perf-tools so should everything be going in perf-tools-next?

Ok, I'll pick up the tools_pmu changes first.

And I think it'd be much easier for me if you break the hwmon change
like with basic PMU enabling and unit/alias support.

Thanks,
Namhyung