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SubjectRe: [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@quaco 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@quaco perf]$
>
> [acme@quaco perf]$ perf stat -h --delay
>
> Usage: perf stat [<options>] [<command>]
>
> -D, --delay <n> ms to wait before starting measurement after program start
>
> [acme@quaco perf]$
>
> [acme@quaco 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

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