linux-kernel - Re: perf test hybrid failing on 14700K

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Date: Tue, 30 Jan 2024 10:56:00 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Kan Liang <kan.liang@...el.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
	linux-perf-users@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: perf test hybrid failing on 14700K

Em Fri, Jan 19, 2024 at 10:09:10PM -0800, Ian Rogers escreveu:
> On Sat, Dec 23, 2023 at 5:55 AM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> >
> > Hi Kan,
> >
> > I noticed the following problem, are you able to reproduce it?
> >
> > Happy solstice!
> >
> > - Arnaldo
> 
> Hi Arnaldo,
> 
> I'm seeing a test failure on Alderlake in perf-tools-next and wondered
> if it was on your radar:
> ```
>  32: Session topology                                                :
> --- start ---
> test child forked, pid 539222
> templ file: /tmp/perf-test-HMet21
> Using CPUID GenuineIntel-6-97-2
> ------------------------------------------------------------
> perf_event_attr:
>  type                             0 (PERF_TYPE_HARDWARE)
>  config                           0x800000000
>  disabled                         1
> ------------------------------------------------------------
> sys_perf_event_open: pid 0  cpu -1  group_fd -1  flags 0x8 = 4
> ------------------------------------------------------------
> perf_event_attr:
>  type                             0 (PERF_TYPE_HARDWARE)
>  config                           0x400000000
>  disabled                         1
> ------------------------------------------------------------
> sys_perf_event_open: pid 0  cpu -1  group_fd -1  flags 0x8 = 5
> non matching sample_type
> FAILED tests/topology.c:73 can't get session
> test child finished with -1
> ---- end ----
> Session topology: FAILED!
> ```
> 
> The code is hitting this line in evlist__valid_sample_type as
> core.nr_entries is 2 on hybrid not 1:
> https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/util/evlist.c?h=perf-tools-next#n1215
> this causes perf_session__open to fail:
> https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/util/session.c?h=perf-tools-next#n129

Yes, I see this as well, haven't yet analysed it

root@...ber:~# perf test -v topology
 38: Session topology                                                :
--- start ---
test child forked, pid 260120
templ file: /tmp/perf-test-WMa4M5
Using CPUID GenuineIntel-6-B7-1
non matching sample_type
FAILED tests/topology.c:73 can't get session
test child finished with -1
---- end ----
Session topology: FAILED!
root@...ber:~#