linux-kernel - Re: [PATCH] perf test: Fix test_arm

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Date:   Fri, 14 Oct 2022 10:33:47 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     James Clark <james.clark@....com>
Cc:     Leo Yan <leo.yan@...aro.org>, coresight@...ts.linaro.org,
        suzuki.poulose@....com, linux-perf-users@...r.kernel.org,
        mathieu.poirier@...aro.org, mike.leach@...aro.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf test: Fix test_arm_coresight.sh failures on Juno

Em Mon, Oct 10, 2022 at 10:21:22AM +0100, James Clark escreveu:
> On 10/10/2022 08:41, Leo Yan wrote:
> > On Thu, Oct 06, 2022 at 04:11:05PM +0100, James Clark wrote:
> >>   Error:
> >>   The perf.data data has no samples!
> >>   0

> > Thanks for confirmation.  It's a bit weird that your Juno board doesn't
> > produce all zeros for timestamp packets.

> >> I think the issue is that ls is quite quick to run, so not much trace is
> >> generated for Perf. And it just depends on the scheduling which is
> >> slightly different on Juno. I don't think it's a bug. On N1SDP there are
> >> only 134 samples generated with i1000i, so it could probably end up with
> >> a random run generating 0 there too.

> > Agreed, changing to smaller interval makes sense for me.

> > Reviewed-by: Leo Yan <leo.yan@...aro.org>

> Thanks for the review Leo

Thanks, applied.

- Arnaldo