linux-kernel - perf mem record not getting the mem_load

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Message-ID: <Zthu81fA3kLC2CS2@x1>
Date: Wed, 4 Sep 2024 11:30:11 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Kan Liang <kan.liang@...ux.intel.com>
Cc: Ian Rogers <irogers@...gle.com>, Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-perf-users@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: perf mem record not getting the mem_load_aux events by default

Hi Kan,

Recently I presented about 'perf mem record' and found that I had use
'perf record' directly as 'perf mem record' on a Intel Hybrid system
wasn't selecting the required aux event:

  http://vger.kernel.org/~acme/prez/lsfmm-bpf-2024/#/19

The previous slides show the problem and the one above shows what worked
for me.

I saw this while trying to fix that:

Author: Kan Liang <kan.liang@...ux.intel.com>
commit abbdd79b786e036e60f01b7907977943ebe7a74d
Date:   Tue Jan 23 10:50:32 2024 -0800

    perf mem: Clean up perf_mem_events__name()
    
    Introduce a generic perf_mem_events__name(). Remove the ARCH-specific
    one.
    
    The mem_load events may have a different format. Add ldlat and aux_event
    in the struct perf_mem_event to indicate the format and the extra aux
    event.
    
    Add perf_mem_events_intel_aux[] to support the extra mem_load_aux event.
    
    Rename perf_mem_events__name to perf_pmu__mem_events_name.

--------------------------´

So there are provisions for selecting the right events, but it doesn't
seem to be working when I tried, can you take a look at what I describe
on those slides and see what am I doing wrong?

Thanks,

- Arnaldo