linux-kernel - Re: [PATCH v3 00/17] perf: ftrace enhancement

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Date:   Fri, 10 Jul 2020 21:35:58 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Changbin Du <changbin.du@...il.com>, Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/17] perf: ftrace enhancement

On Wed, Jul 08, 2020 at 02:39:59PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Jul 09, 2020 at 12:45:48AM +0800, Changbin Du escreveu:
> > Here is a glance of all ftrace functions with this serias:
> > 
> > $ sudo perf ftrace -h
>  
> >  Usage: perf ftrace [<options>] [<command>]
> >     or: perf ftrace [<options>] -- <command> [<options>]
> > 
> >     -a, --all-cpus        system-wide collection from all CPUs
> >     -C, --cpu <cpu>       list of cpus to monitor
> >     -d, --delay <n>       ms to wait before starting tracing after program start
> >     -D, --graph-depth <n>
> >                           Max depth for function graph tracer (This option is deprecated)
> >     -F, --funcs           Show available functions to filter
> >     -G, --graph-funcs <func>
> >                           trace given functions using function_graph tracer
> >     -g, --nograph-funcs <func>
> >                           Set nograph filter on given functions
> >     -m, --buffer-size <size>
> >                           size of per cpu buffer
> >     -N, --notrace-funcs <func>
> >                           do not trace given functions
> >     -p, --pid <pid>       trace on existing process id
> >     -t, --tid <tid>       trace on existing thread id (exclusive to --pid)
> >     -T, --trace-funcs <func>
> >                           trace given functions using function tracer
> >     -t, --tracer <tracer>
> >                           tracer to use: function or function_graph (This option is deprecated)
> >     -v, --verbose         be more verbose
> >         --func-opts <options>
> >                           function tracer options, available options: call-graph,irq-info
> >         --graph-opts <options>
> >                           graph tracer options, available options: nosleep-time,noirqs,verbose,thresh=<n>,depth=<n>
> >         --inherit         trace children processes
> > 
> > v3:
> >   o add --func-opts and --graph-opts to set tracer specific options.
> >   o support units as a suffix for option '-m/--buffer-size'.
> 
> Thanks for working on this! -d/--delay:
> 
> [acme@...co perf]$ perf record -h delay
> 
>  Usage: perf record [<options>] [<command>]
>     or: perf record [<options>] -- <command> [<options>]
> 
>     -D, --delay <n>       ms to wait before starting measurement after program start
> 
> [acme@...co perf]$
> 
> [acme@...co perf]$ perf stat -h --delay
> 
>  Usage: perf stat [<options>] [<command>]
> 
>     -D, --delay <n>       ms to wait before starting measurement after program start
> 
> [acme@...co perf]$
> 
> [acme@...co perf]$ perf trace -h -D
> 
>  Usage: perf trace [<options>] [<command>]
>     or: perf trace [<options>] -- <command> [<options>]
>     or: perf trace record [<options>] [<command>]
>     or: perf trace record [<options>] -- <command> [<options>]
> 
>     -D, --delay <n>       ms to wait before starting measurement after program start
> 
> Perhaps we can move --graph-depth to --graph-opts and make -D/--delay be
> just like with 'perf record', 'perf stat' and 'perf trace'?
> 
> Will be super nice if one can go from:
> 
> 	perf stat --delay 100 workload
> 
> to see the default set of counters to:
> 
> 	perf ftrace --delay 100 workload
> 
> to get the ftrace output for that.
> 
> Ditto seeing the syscalls strace-like with:
> 
> 	perf trace --delay 100 workload
>
No problem. Now -D/--graph-depth is moved to --graph-opts.

> Regards,
> 
> - Arnaldo

-- 
Cheers,
Changbin Du