linux-kernel - Re: [PATCH] perf trace: Add usage of --no-syscalls in man page

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Date:   Thu, 13 Apr 2017 10:51:03 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, alexis.berlemont@...il.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf trace: Add usage of --no-syscalls in man page

Em Thu, Apr 13, 2017 at 11:32:12AM +0530, Ravi Bangoria escreveu:
> perf trace supports --no-syscalls option but it's not listed in
> the man page. (Though, I see an example using --no-syscalls in
> EXAMPLES section.)

Thanks, applied.

I'm thinking about making --no-syscalls the default when 'trace' is
hardlinked to 'perf', i.e. 'perf trace'  remains as it is, but if one
calls 'trace', then --no-syscalls is the default, as after non-syscall
events got supported I find myself using --no-syscalls way too often,
what do you think?

Or perhaps have a 'perf strace' to try to have as much in common with
'strace' in terms of default behaviour, options, etc?

- Arnaldo
 
> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> ---
>  tools/perf/Documentation/perf-trace.txt | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
> index afd7286..c1e3288 100644
> --- a/tools/perf/Documentation/perf-trace.txt
> +++ b/tools/perf/Documentation/perf-trace.txt
> @@ -123,7 +123,8 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
>  	major or all pagefaults. Default value is maj.
>  
>  --syscalls::
> -	Trace system calls. This options is enabled by default.
> +	Trace system calls. This options is enabled by default, disable with
> +	--no-syscalls.
>  
>  --call-graph [mode,type,min[,limit],order[,key][,branch]]::
>          Setup and enable call-graph (stack chain/backtrace) recording.
> -- 
> 2.1.4