linux-kernel - Re: [PATCH v8 0/4] perf: arm-spe: Decode SPE source and use for perf c2c

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Date:   Thu, 26 May 2022 22:44:53 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Joe Mario <jmario@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ali Saidi <alisaidi@...zon.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, german.gomez@....com,
        benh@...nel.crashing.org, Nick.Forrington@....com,
        alexander.shishkin@...ux.intel.com, andrew.kilroy@....com,
        james.clark@....com, john.garry@...wei.com,
        Jiri Olsa <jolsa@...nel.org>, kjain@...ux.ibm.com,
        lihuafei1@...wei.com, mark.rutland@....com,
        mathieu.poirier@...aro.org, mingo@...hat.com, namhyung@...nel.org,
        peterz@...radead.org, will@...nel.org
Subject: Re: [PATCH v8 0/4] perf: arm-spe: Decode SPE source and use for perf
 c2c

Hi Joe,

On Mon, May 23, 2022 at 01:24:32PM -0400, Joe Mario wrote:

[...]

> Hi Leo:
> I figured out why my output was different than yours.
> 
> I did not have the slang-devel rpm installed on the host system.  
> 
> In my original perf build, I missed the this output in the build log:
>  > slang not found, disables TUI support. Please install slang-devel, libslang-dev or libslang2-dev
> 
> Once I installed slang-devel, rebuilt perf, and then reran my test, the pareto output looked fine.
> 
> When the TUI support is disabled, it shouldn't corrupt the resulting stdio output.  I don't believe this has anything to do with your commits.  

Thanks for taking time to hunt this issue.  I checked the code and
sent out a patch to fix the stdio interface if slang lib is not
installed.  Please see the patch:

https://lore.kernel.org/lkml/20220526143917.607928-1-leo.yan@linaro.org/T/#u

> Last, it looks like you should update the help text for the display flag options to reflect your new peer option.
> Currently it says:
>    -d, --display <Switch HITM output type>
>                           lcl,rmt
> 
> But since you added the "peer" display, shouldn't the output for that help text state:
>    -d, --display <Switch HITM output type>
>                           lcl,rmt,peer

Yeah, will fix.

Very appreciate for your detailed testing and suggestions.

Leo