linux-kernel - Re: [PATCH RESEND v3 5/6] perf record: Support AUX pause and resume with BPF

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Message-ID: <20250731105737.GG143191@e132581.arm.com>
Date: Thu, 31 Jul 2025 11:57:37 +0100
From: Leo Yan <leo.yan@....com>
To: kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	KP Singh <kpsingh@...nel.org>,
	Matt Bobrowski <mattbobrowski@...gle.com>,
	Song Liu <song@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	James Clark <james.clark@...aro.org>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>, bpf@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v3 5/6] perf record: Support AUX pause and resume
 with BPF

Hi,

On Thu, Jul 31, 2025 at 10:11:48AM +0100, Leo Yan wrote:
> Hi,
> 
> On Thu, Jul 31, 2025 at 03:26:01PM +0800, kernel test robot wrote:
> 
> [...]
> 
> > 2025-07-30 19:06:25 sudo /usr/src/linux-perf-x86_64-rhel-9.4-bpf-e350af63969b875598f0656a20d801bbcaa7bd76/tools/perf/perf test 64 -v
> >  64: Convert perf time to TSC                                        :
> >  64.1: TSC support                                                   : Running (2 active)
> >  64.1: TSC support                                                   : Ok
> > --- start ---
> > test child forked, pid 7359
> > Using CPUID GenuineIntel-6-9E-D
> > evlist__open() failed
> > ---- end(-1) ----
> >  64.2: Perf time to TSC                                              : FAILED!
> 
> I roughly read the job.yaml file, seems it does not install clang.
> Thus, the building will not enalbe the option BUILD_BPF_SKEL=1.
> 
> As a result, auxtrace__update_bpf_map() will return a failure. I will
> fix this issue in next spin.
> 
> Thanks for test and reporting.

I played a bit and found that if with the option "BUILD_BPF_SKEL := 0",
I even failed to build perf (I will fix in new version).

I think you should have built perf with enabled BUILD_BPF_SKEL. However,
in this case, I cannot reproduce the test failure, both on my x86_64 and
Arm64 machines. I reviewed the code and have no clue this patch will
cause the failure.

Is it possible to run the test at your side with the option "perf test
64 -vvv" for debugging info?  Or if it is possible related to the
setting kernel.perf_event_paranoid?

Thanks,
Leo