From: German Gomez <german.gomez@arm.com>
To: Leo Yan <leo.yan@linaro.org>
Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
acme@kernel.org, Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>
Subject: Re: [PATCH 1/1] perf arm-spe: extend Arm SPE test script with regression testing
Date: Tue, 23 Nov 2021 11:41:41 +0000 [thread overview]
Message-ID: <4ab0260a-3acb-e515-c963-91de35385d07@arm.com> (raw)
In-Reply-To: <20211123051924.GE124250@leoy-ThinkPad-X240s>
Hi Leo,
Thanks for the comments.
On 23/11/2021 05:19, Leo Yan wrote:
> Hi German,
>
> On Fri, Nov 12, 2021 at 04:20:03PM +0000, German Gomez wrote:
>> Extend the test_arm_spe.sh script to test for regressions in the
>> decoding flow of Arm SPE samples. In order to support the tests, a set
>> of perf.data files has been generated offline and is being hosted under
>> tools/perf/tests/shell/test_arm_spe.tgz:
> Seems to me it's not a good idea to upstream perf data binaries into the
> mainline kernel. I understood you want to test the perf data with
> different context tracing modes (using contextidr vs switch events),
> since these two different modes we cannot capture them with the same
> kernel Image, I think this is the main reason you upstreamed the perf
> data binaries in this patch.
For this patch I wanted to test the decoding of SPE events, given fixed
inputs, in order to lock the current implementation of the decoder.
>
> On the other hand, like CoreSight smoke testing, by default we can give
> priority for testing root PID namespace, so you could do the test with
> below commands, which is assumed that tracing PID in contextidr:
>
> perf record -e arm_spe_0// -- test_program
> perf report
> perf script
>
> Then, for testing non-root PID namespace, can we use the command
> "unshare" to create a namespace and run perf tool in a non-root
> PID namespace? In this way, you could record Arm SPE trace data and
> decode it on the fly. Finally we can avoid to upstream perf data
> binaries.
I think adding additional smoke testing is a good idea. We could also
check if CONTEXTIDR is enabled in the config (either /boot/config... or
/proc/config.gz).
Thanks,
German
>
> Thanks,
> Leo
prev parent reply other threads:[~2021-11-23 11:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-12 16:20 [PATCH 0/1] perf arm-spe: extend Arm SPE test script with regression testing German Gomez
2021-11-12 16:20 ` [PATCH 1/1] " German Gomez
2021-11-22 13:46 ` German Gomez
2021-11-23 5:19 ` Leo Yan
2021-11-23 11:41 ` German Gomez [this message]
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