linux-kernel - Re: [PATCH v2] perf tools: Skip BPF sideband event for userspace profiling

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Message-ID: <CAPhsuW6wuBjCo9ygCFhyYimEHg5ZNtN7-Yd+gWuMJPTU781vFw@mail.gmail.com>
Date: Thu, 27 Feb 2025 10:50:26 -0800
From: Song Liu <song@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Ian Rogers <irogers@...gle.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>, 
	linux-perf-users@...r.kernel.org, James Clark <james.clark@...aro.org>
Subject: Re: [PATCH v2] perf tools: Skip BPF sideband event for userspace profiling

On Wed, Feb 26, 2025 at 9:17 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> The BPF sideband information is tracked using a separate thread and
> evlist.  But it's only useful for profiling kernel and we can skip it
> when users profile their application only in userspace.
>
> It seems it already fails to open the sideband event in that case.
> Let's remove the noise in the verbose output anyway.
>
> Cc: Song Liu <song@...nel.org>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

This turns out to be more complicated than I thought. I actually
like v1 better.

Thanks,
Song