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

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Date:   Fri, 31 Jul 2020 19:42:20 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
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>,
        Namhyung Kim <namhyung@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 00/18] perf: ftrace enhancement



On July 31, 2020 2:35:20 PM GMT-03:00, Changbin Du <changbin.du@...il.com> wrote:
>Hi Arnaldo,
>Are we ready to merge this serias now Thanks. :)


Next week I'll be in vacation, do I'll have more time for upstream stuff,

- Arnaldo


>
>On Sat, Jul 18, 2020 at 02:48:08PM +0800, Changbin Du 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.
>> 
>> 
>> 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
>> 

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