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Message-ID: <aM3A-2kYse8nMP9K@x1> Date: Fri, 19 Sep 2025 17:45:47 -0300 From: Arnaldo Carvalho de Melo <acme@...nel.org> To: Ian Rogers <irogers@...gle.com> Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 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>, James Clark <james.clark@...aro.org>, Chun-Tse Shao <ctshao@...gle.com>, Thomas Falcon <thomas.falcon@...el.com>, Yang Li <yang.lee@...ux.alibaba.com>, linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v1 0/4] Test fixes and debug logging On Sun, Sep 14, 2025 at 11:28:56AM -0700, Ian Rogers wrote: > Testing in a hypervisor guest showed some issues that these patches > try to address, or improve the debug situation upon. > > Ian Rogers (4): > perf test: Be tolerant of missing json metric none value > perf parse-events: Add debug logging to perf_event > perf test: Don't fail if user rdpmc returns 0 when disabled > perf stat-shadow: Display metric-only for 0 counters Applied, but while checking before/after on a host, I see that these are quite unstable: root@x1:~# perf test -r10 linter 94: perf stat CSV output linter : FAILED! 94: perf stat CSV output linter : FAILED! 94: perf stat CSV output linter : FAILED! 94: perf stat CSV output linter : FAILED! 94: perf stat CSV output linter : FAILED! 94: perf stat CSV output linter : FAILED! 94: perf stat CSV output linter : FAILED! 94: perf stat CSV output linter : FAILED! 94: perf stat CSV output linter : FAILED! 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok 99: perf stat STD output linter : Ok 99: perf stat STD output linter : Ok 99: perf stat STD output linter : FAILED! 99: perf stat STD output linter : FAILED! 99: perf stat STD output linter : Ok 99: perf stat STD output linter : FAILED! 99: perf stat STD output linter : Ok 99: perf stat STD output linter : Ok 99: perf stat STD output linter : FAILED! root@x1:~# root@x1:~# for a in $(seq 20) ; do perf test linter ; echo "------" ; done 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : FAILED! ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : FAILED! ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ 94: perf stat CSV output linter : FAILED! 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok ------ root@x1:~# root@x1:~# uname -a Linux x1 6.16.5-200.fc42.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Sep 4 16:37:21 UTC 2025 x86_64 GNU/Linux root@x1:~# grep -m1 "model name" /proc/cpuinfo model name : 13th Gen Intel(R) Core(TM) i7-1365U root@x1:~# All is well on AMD land: root@...ber:~# perf test linter 94: perf stat CSV output linter : Ok 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok root@...ber:~# perf test -r 5 linter 94: perf stat CSV output linter : Ok 94: perf stat CSV output linter : Ok 94: perf stat CSV output linter : Ok 94: perf stat CSV output linter : Ok 94: perf stat CSV output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 97: perf stat JSON output linter : Ok 99: perf stat STD output linter : Ok 99: perf stat STD output linter : Ok 99: perf stat STD output linter : Ok 99: perf stat STD output linter : Ok 99: perf stat STD output linter : Ok root@...ber:~# uname -a Linux number 6.16.7-200.fc42.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Sep 11 17:46:54 UTC 2025 x86_64 GNU/Linux root@...ber:~# grep -m1 "model name" /proc/cpuinfo model name : AMD Ryzen 9 9950X3D 16-Core Processor root@...ber:~# acme@...ber:~/git/perf-tools-next$ git log --oneline -5 58c26aeac5132152 (HEAD -> perf-tools-next, perf-tools-next/tmp.perf-tools-next) perf stat-shadow: Display metric-only for 0 counters f46533cc149e39bd perf test: Don't fail if user rdpmc returns 0 when disabled 9bb146fd8a342ae1 perf parse-events: Add debug logging to perf_event 64b3eae288bb4370 perf test: Be tolerant of missing json metric none value 0dc96cae063cbf9e perf build-id: Ensure snprintf string is empty when size is 0 acme@...ber:~/git/perf-tools-next$ sudo su - root@...ber:~# perf -v perf version 6.17.rc6.g58c26aeac513 root@...ber:~# - Arnaldo
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