linux-kernel - Re: [PATCH v2 0/3] Fix incorrect counts when count the same uncore event multiple times

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Message-ID: <CAP-5=fWv4=8Uq8jDbqNR3O+JAw-T0OUGoj5o=pMHxyFKsbEDyw@mail.gmail.com>
Date: Thu, 27 Mar 2025 21:20:36 -0700
From: Ian Rogers <irogers@...gle.com>
To: Chun-Tse Shao <ctshao@...gle.com>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...hat.com, 
	acme@...nel.org, namhyung@...nel.org, mark.rutland@....com, 
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org, adrian.hunter@...el.com, 
	kan.liang@...ux.intel.com, james.clark@...aro.org, howardchu95@...il.com, 
	yeoreum.yun@....com, linux@...blig.org, ak@...ux.intel.com, 
	weilin.wang@...el.com, asmadeus@...ewreck.org, 
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Fix incorrect counts when count the same uncore
 event multiple times

On Thu, Mar 27, 2025 at 3:56 PM Chun-Tse Shao <ctshao@...gle.com> wrote:
>
> Let's take a look an example, the machine is SKX with 6 IMC devices.
>
>   perf stat -e clockticks,clockticks -I 1000
>   #           time             counts unit events
>        1.001127430      6,901,503,174      uncore_imc_0/clockticks/
>        1.001127430      3,940,896,301      uncore_imc_0/clockticks/
>        2.002649722        988,376,876      uncore_imc_0/clockticks/
>        2.002649722        988,376,141      uncore_imc_0/clockticks/
>        3.004071319      1,000,292,675      uncore_imc_0/clockticks/
>        3.004071319      1,000,294,160      uncore_imc_0/clockticks/
>
> 1) The events name should not be uniquified.
> 2) The initial count for the first `clockticks` is doubled.
> 3) Subsequent count only report for the first IMC device.
>
> The first patch fixes 1) and 3), and the second patch fixes 2).
>
> After these fix:
>
>   perf stat -e clockticks,clockticks -I 1000
>   #           time             counts unit events
>        1.001127586      4,126,938,857      clockticks
>        1.001127586      4,121,564,277      clockticks
>        2.001686014      3,953,806,350      clockticks
>        2.001686014      3,953,809,541      clockticks
>        3.003121403      4,137,750,252      clockticks
>        3.003121403      4,137,749,048      clockticks
>
> I also tested `-A`, `--per-socket`, `--per-die` and `--per-core`, all
> looks good.
>
> Ian tested `hybrid-merge` and `hwmon`, all looks good as well.
>
> Chun-Tse Shao (1):
>   perf test: Add stat uniquifying test
>
> Ian Rogers (2):
>   perf evlist: Make uniquifying counter names consistent
>   perf parse-events: Use wildcard processing to set an event to merge
>     into

Tested-by: Ian Rogers <irogers@...gle.com>

There could be minor conflict with this unreviewed series:
https://lore.kernel.org/lkml/20250318041442.321230-1-irogers@google.com/

Thanks,
Ian

>  tools/perf/builtin-record.c                   |   7 +-
>  tools/perf/builtin-top.c                      |   7 +-
>  .../tests/shell/stat+event_uniquifying.sh     |  69 ++++++++
>  tools/perf/util/evlist.c                      |  66 +++++---
>  tools/perf/util/evlist.h                      |   3 +-
>  tools/perf/util/evsel.c                       | 119 ++++++++++++-
>  tools/perf/util/evsel.h                       |  11 +-
>  tools/perf/util/parse-events.c                |  86 +++++++---
>  tools/perf/util/stat-display.c                | 160 ++----------------
>  tools/perf/util/stat.c                        |  40 +----
>  10 files changed, 329 insertions(+), 239 deletions(-)
>  create mode 100755 tools/perf/tests/shell/stat+event_uniquifying.sh
>
> --
> v2:
>   - Fixes for `hwmon` and `--hybrid-merge`.
>   - Add a test for event uniquifying.
>
> v1: lore.kernel.org/20250326234758.480431-1-ctshao@...gle.com
> 2.49.0.472.ge94155a9ec-goog
>