linux-kernel - Re: [PATCH] rtla: Fix -t/--trace[=file]

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Message-ID: <bb4232d6-2387-425f-9b10-811163e74329@kernel.org>
Date: Fri, 10 May 2024 10:10:48 +0200
From: Daniel Bristot de Oliveira <bristot@...nel.org>
To: John Kacur <jkacur@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>, linux-trace-devel@...r.kernel.org,
 lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rtla: Fix -t/--trace[=file]

On 5/8/24 23:21, John Kacur wrote:
> Normally with a short option we don't provide an equals sign like this
> -tfile.txt
> -t file.txt
> 
> But we do provide an equals sign with the long option like this
> --trace=file.txt
> 
> Also, a good parser should work with a space instead of an equals sign
> --trace file.txt
> 
> Most of these are broken!

So, it is set to work _only_ with =file. It would be better to have
it more robust... yes.

> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -tfile.txt
> Saving trace to ile.txt
> File name truncated
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t file.txt
> Saving trace to timerlat_trace.txt
> Default file name used instead of the requested one.
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t=file.txt
> Saving trace to file.txt
> This works, but people normally don't use '=' with a short option
> 
> /rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace=file.txt
> Saving trace to ile.txt
> File name truncated
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace file.txt
> timerlat_trace.txt
> Default file name used instead of the requested one.
> 
> After the fix
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -tfile.txt
> Saving trace to file.txt
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t file.txt
> Saving trace to file.txt
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t=file.txt
> Saving trace to file.txt
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace=file.txt
> Saving trace to file.txt
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace file.txt
> Saving trace to file.txt
> 
> I also tested -t and --trace without providing a file name both as the
> last requested option and with a following long and short option
> 
> For example
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t -u
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace -u
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace
> 
> And all correctly do Saving trace to timerlat_trace.txt as expected
> 
> This fix is applied to both timerlat top and hist
> and to osnoise top and hist.

Ok, code wise it is fine. But it is still missing the changes for the --help
messages and man pages. Would you mind addressing them?

For instance, removing the need for the =...

s/
-t/--trace[=file]: save the stopped trace to [file|timerlat_trace.txt]
/
-t/--trace [file]: save the stopped trace to [file|timerlat_trace.txt]
/

Also, for the man page we will have to move the -t option from common_options.rst
to common_timerlat_options.rst and common_osnoise_options.rst to fix this in
man rtla-timerlat-top:

       -t, --trace[=file]
          Save the stopped trace to [file|osnoise_trace.txt].

(it is pointing to the wrong file)

Thanks!
-- Daniel