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Fri, 13 Mar 2026 08:56:56 -0700 (PDT) Date: Fri, 13 Mar 2026 12:56:52 -0300 From: Arnaldo Melo To: Ian Rogers , Arnaldo Carvalho de Melo CC: Thomas Richter , "linux-perf-use." , Jan Polensky Subject: Re: perf stat issue with 7.0.0rc3 User-Agent: Thunderbird for Android In-Reply-To: References: <66d0366b-8690-4bde-aba4-1d51f278dfa1@linux.ibm.com> Message-ID: Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On March 13, 2026 12:41:48 PM GMT-03:00, Ian Rogers = wrote: >On Fri, Mar 13, 2026 at 8:19=E2=80=AFAM Arnaldo Carvalho de Melo > wrote: >> >> On Fri, Mar 13, 2026 at 02:13:18PM +0100, Thomas Richter wrote: >> > Ian, >> > >> > I just discovered a strange behavior on linux 7=2E0=2E0rc3=2E >> > >> > I run these commands on my x86 virtual machine: >> > >> > bash-5=2E3# uname -m >> > x86_64 >> > bash-5=2E3# perf -v >> > perf version 6=2E18=2E13-200=2Efc43=2Ex86_64 >> > bash-5=2E3# perf stat -- true >> > >> > Performance counter stats for 'true': >> > >> > 1=2E108=2E929 task-clock # 0,4= 37 CPUs utilized >> > 0 context-switches # 0,000 /= sec >> > 0 cpu-migrations # 0,000 /= sec >> > 55 page-faults # 49,597 K= /sec >> > cycles >> > >> > 0,002536439 seconds time elapsed >> > >> > 0,001363000 seconds user >> > 0,001393000 seconds sys >> > >> > bash-5=2E3# >> > >> > This is the epected output, however when I use the perf version 7=2E0= =2E0rc3: >> > >> > bash-5=2E3# =2E/perf -v >> > perf version 7=2E0=2Erc3=2Eg1f318b96cc84 >> > bash-5=2E3# =2E/perf stat -- true >> > Error: >> > No supported events found=2E >> > trace=2Eargs_alignment >> >> And this last line is even stranger, in my case I get something else, >> also on x86_64: >> >> root@number:~# perf stat -- true >> Error: >> No supported events found=2E >> addr2line=2Estyle >> root@number:~# >> >> On an ARM machine: >> >> acme@raspberrypi:~/git/perf-tools $ perf stat -- true >> Error: >> No supported events found=2E >> >> acme@raspberrypi:~/git/perf-tools $ uname -a >> Linux raspberrypi 6=2E12=2E62+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6=2E= 12=2E62-1+rpt1 (2025-12-18) aarch64 GNU/Linux >> acme@raspberrypi:~/git/perf-tools $ >> >> I'll try to bisect this later, thanks for the report! > >Hi Arnaldo, > >Leo has pointed at the fix: >https://web=2Egit=2Ekernel=2Eorg/pub/scm/linux/kernel/git/perf/perf-tools= -next=2Egit/commit/tools/perf/util/metricgroup=2Ec?h=3Dperf-tools-next&id= =3Dc5a244bf17caf2de22f9e100832b75f72b31d3e6 >This also showed up as missing for the LTS backports: >https://lore=2Ekernel=2Eorg/lkml/ad95d781-7eb2-4c0c-a9e9-aaabae8eb602@ker= nel=2Eorg/ >so I thought it was flagged as a fix for the next PR=2E I don't see it in= there: >https://lore=2Ekernel=2Eorg/lkml/20260313151434=2E1695228-1-acme@kernel= =2Eorg/ >Could we get it in? > Sure, I'll process it for the next PR, thanks for pointing it to me, I'll = test it later,=20 - Arnaldo >Thanks, >Ian > > > >> - Arnaldo >> >> > bash-5=2E3# >> > >> > Same happens on my s390 systems (LPAR and z/VM)=2E >> > Is this a known already? >> > I guess this is a perf tool issue, same result when you execute this = on a 7=2E0=2E0rc3 >> > kernel=2E >> > >> > Any ideas where to start debugging >> > -- >> > Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Ge= rmany >> > -- >> > IBM Deutschland Research & Development GmbH >> > >> > Vorsitzender des Aufsichtsrats: Wolfgang Wendt >> > >> > Gesch=C3=A4ftsf=C3=BChrung: David Faller >> > >> > Sitz der Gesellschaft: B=C3=B6blingen / Registergericht: Amtsgericht = Stuttgart, HRB 243294 >> > - Arnaldo