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

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Date: Tue, 30 Jan 2024 09:02:16 -0500
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
 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



On 2024-01-30 8:56 a.m., Arnaldo Carvalho de Melo wrote:
> 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

This should has been fixed by James.
https://lore.kernel.org/lkml/20240124094358.489372-1-james.clark@arm.com/

Thanks,
Kan
> 
> 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:~#
>