linux-kernel - Re: [PATCH v4 00/44] Fix perf on Intel hybrid CPUs

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Date:   Tue, 16 May 2023 15:19:14 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     "Liang, Kan" <kan.liang@...ux.intel.com>,
        Ahmad Yasin <ahmad.yasin@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Perry Taylor <perry.taylor@...el.com>,
        Samantha Alt <samantha.alt@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Weilin Wang <weilin.wang@...el.com>,
        Edward Baker <edward.baker@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Florian Fischer <florian.fischer@...q.space>,
        Rob Herring <robh@...nel.org>,
        John Garry <john.g.garry@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Leo Yan <leo.yan@...aro.org>,
        Yang Jihong <yangjihong1@...wei.com>,
        James Clark <james.clark@....com>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        Kang Minchul <tegongkang@...il.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 00/44] Fix perf on Intel hybrid CPUs

Em Mon, May 15, 2023 at 03:49:45PM -0700, Ian Rogers escreveu:
> On Sun, May 14, 2023 at 5:03 AM Liang, Kan <kan.liang@...ux.intel.com> wrote:
> > - Segmentation fault with perf stat --topdown on ADL (hybrid) and
> > Cascade Lake.
> >   It looks like a legacy issue, may not be introduced by this patch set.
> >   Here is the backtrace. It looks like there is a NULL metric_group.
> >
> > (gdb) backtrace
> > #0  0x00007ffff73035d1 in __strstr_sse2_unaligned () from /lib64/libc.so.6
> > #1  0x00000000004f9019 in metricgroup__topdown_max_level_callback
> > (pm=<optimized out>, table=<optimized out>,
> >     data=0x7fffffff92f4) at util/metricgroup.c:1722
> > #2  0x00000000005e8a31 in pmu_metrics_table_for_each_metric
> > (table=0xcb74d0 <pmu_events_map+368>,
> >     fn=fn@...ry=0x4f8ff0 <metricgroup__topdown_max_level_callback>,
> > data=data@...ry=0x7fffffff92f4)
> >     at pmu-events/pmu-events.c:61123
> > #3  0x00000000004fbc3b in metricgroups__topdown_max_level () at
> > util/metricgroup.c:1742
> > #4  0x000000000042c135 in add_default_attributes () at builtin-stat.c:1845
> > #5  cmd_stat (argc=0, argv=0x7fffffffe3e0) at builtin-stat.c:2446
> > #6  0x00000000004b922b in run_builtin (p=p@...ry=0xd5c530
> > <commands+336>, argc=argc@...ry=2,
> >     argv=argv@...ry=0x7fffffffe3e0) at perf.c:323
> > #7  0x000000000040e373 in handle_internal_command (argv=0x7fffffffe3e0,
> > argc=2) at perf.c:377
> > #8  run_argv (argv=<synthetic pointer>, argcp=<synthetic pointer>) at
> > perf.c:421
> > #9  main (argc=2, argv=0x7fffffffe3e0) at perf.c:537
> > (gdb)
> 
> Thanks, there's a 1-liner for the segv:
> https://lore.kernel.org/lkml/20230515224530.671331-1-irogers@google.com/
> Arnaldo, can we make sure this goes toward the next 6.4 release candidate?

Sure.

- Arnaldo