linux-kernel - Re: [PATCH v7 00/18] perf: ftrace enhancement

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Date:   Tue, 21 Jul 2020 22:39:34 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Changbin Du <changbin.du@...il.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 00/18] perf: ftrace enhancement

Hello,

On Sat, Jul 18, 2020 at 3:48 PM Changbin Du <changbin.du@...il.com> wrote:
>
> The perf has basic kernel ftrace support but lack support of most tracing
> options. This serias is target to enhance the perf ftrace functionality so
> that we can make full use of kernel ftrace with perf.
>
> In general, this serias be cataloged into two main changes:
>   1) Improve usability of existing functions. For example, we don't need to type
>      extra option to select the tracer.
>   2) Add new options to support all other ftrace functions.
>
> 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
>     -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, --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
>         --tid <tid>       trace on existing thread id (exclusive to --pid)
>
> v7:
>   o add back '--tid <tid>'.
> v6:
>   o fix return value of read_tracing_file_to_stdout().
>   o make __cmd_ftrace() shorter.
>   o remove option '-t, --tid <tid>'.
> v5:
>   o trivial fixes.
> v4:
>   o add util/parse-sublevel-options.c
>   O remove -D/--graph-depth
> v3:
>   o add --func-opts and --graph-opts to set tracer specific options.
>   o support units as a suffix for option '-m/--buffer-size'.
> v2:
>   o patches for option '-u/--userstacktrace' and '--no-pager' are dropped.
>   o update all related perf documentation.
>   o rename some options. Now all funcgraph tracer options are prefixed with
>     '--graph-', while all function tracer options are prefixed with '--func-'.
>   o mark old options deprecated instead of removing them.

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks
Namhyung

>
>
> Changbin Du (18):
>   perf ftrace: select function/function_graph tracer automatically
>   perf ftrace: add option '-F/--funcs' to list available functions
>   perf ftrace: factor out function write_tracing_file_int()
>   perf ftrace: add option '-m/--buffer-size' to set per-cpu buffer size
>   perf ftrace: show trace column header
>   perf ftrace: add option '--inherit' to trace children processes
>   perf: util: add general function to parse sublevel options
>   perf ftrace: add support for tracing option 'func_stack_trace'
>   perf ftrace: add support for trace option sleep-time
>   perf ftrace: add support for trace option funcgraph-irqs
>   perf ftrace: add support for tracing option 'irq-info'
>   perf ftrace: add option 'verbose' to show more info for graph tracer
>   perf ftrace: add support for trace option tracing_thresh
>   perf: ftrace: allow set graph depth by '--graph-opts'
>   perf ftrace: add option -D/--delay to delay tracing
>   perf ftrace: add option --tid to filter by thread id
>   perf: ftrace: Add set_tracing_options() to set all trace options
>   perf ftrace: add change log
>
>  tools/perf/Documentation/perf-config.txt |   5 -
>  tools/perf/Documentation/perf-ftrace.txt |  36 +-
>  tools/perf/builtin-ftrace.c              | 415 +++++++++++++++++++++--
>  tools/perf/util/Build                    |   1 +
>  tools/perf/util/debug.c                  |  61 +---
>  tools/perf/util/parse-sublevel-options.c |  70 ++++
>  tools/perf/util/parse-sublevel-options.h |  11 +
>  7 files changed, 513 insertions(+), 86 deletions(-)
>  create mode 100644 tools/perf/util/parse-sublevel-options.c
>  create mode 100644 tools/perf/util/parse-sublevel-options.h
>
> --
> 2.25.1
>