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

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Message-ID: <Z8JS2P-QwHcPUpTV@google.com>
Date: Fri, 28 Feb 2025 16:20:40 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Song Liu <song@...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 Thu, Feb 27, 2025 at 10:50:26AM -0800, Song Liu wrote:
> 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.

Sure, the complexity comes from moving the code to reduce the
duplication.  But either is fine to me.

Can I add your Acked-by to v1, then?

Thanks,
Namhyung