linux-kernel - Re: [RFE] perf probe: Support globbing/regex in -a

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Date:	Thu, 09 Apr 2015 14:27:52 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFE] perf probe: Support globbing/regex in -a

Hi Arnaldo,

(2015/04/09 4:48), Arnaldo Carvalho de Melo wrote:
> Hi Masami,
> 
> 	In tools/perf constructors are named <CLASS>__new, and right now I want
> to know hoe many of each <CLASS> objects are being allocated, so I expected to
> be able to do:
> 
> [root@zoo ~]# perf probe -x ~/bin/perf -a "*__new"
> Probe point '*__new' not found.
>   Error: Failed to add events.
> [root@zoo ~]#

Actually, I had sent it　:)

https://lkml.org/lkml/2014/10/31/207
https://lkml.org/lkml/2014/10/31/213

I'll update and resend the wildcard support.

> 
> And get the same result that I get from:
> 
> [root@zoo ~]# perf probe -x ~/bin/perf `perf probe -x ~/bin/perf -F | grep __new | sed 's/^/-a /g' | sort -u`
> Added new event:
>   probe_perf:call_path__new (on call_path__new in /home/acme/bin/perf)
> 
> You can now use it in all perf tools, such as:
> 
> 	perf record -e probe_perf:call_path__new -aR sleep 1
> 
> Added new event:
>   probe_perf:call_path_root__new (on call_path_root__new in /home/acme/bin/perf)
> 
> You can now use it in all perf tools, such as:
> 
> 	perf record -e probe_perf:call_path_root__new -aR sleep 1
> 
> Added new event:
>   probe_perf:call_return_processor__new (on call_return_processor__new in /home/acme/bin/perf)
> 
> 
> <SNIP>
> 
> I.e. that I end up with:
> 
> [root@zoo ~]# perf probe -l  2>&1 | grep probe_perf:.*__new
>   probe_perf:call_path__new (on call_path__new@...l/thread-stack.c in /home/acme/bin/perf)
>   probe_perf:call_path_root__new (on call_path_root__new@...l/thread-stack.c in /home/acme/bin/perf)
>   probe_perf:call_return_processor__new (on call_return_processor__new@...l/thread-stack.c in /home/acme/bin/perf)
>   probe_perf:comm__new (on comm__new@...l/comm.c in /home/acme/bin/perf)
>   probe_perf:cpu_map__new (on cpu_map__new@...l/cpumap.c in /home/acme/bin/perf)
>   probe_perf:debuginfo__new (on debuginfo__new@...l/probe-finder.c in /home/acme/bin/perf)
>   probe_perf:disasm_line__new (on disasm_line__new@...l/annotate.c in /home/acme/bin/perf)
>   probe_perf:dso__new  (on dso__new@...l/dso.c in /home/acme/bin/perf)
>   probe_perf:dso__new_map (on dso__new_map@...l/dso.c in /home/acme/bin/perf)
>   probe_perf:fdarray__new (on fdarray__new@...array.c in /home/acme/bin/perf)
>   probe_perf:hist_browser__new (on hist_browser__new@...browsers/hists.c in /home/acme/bin/perf)
> <SNIP>
>   probe_perf:thread_map__new_by_uid (on thread_map__new_by_uid@...l/thread_map.c in /home/acme/bin/perf)
>   probe_perf:thread_map__new_dummy (on thread_map__new_dummy@...l/thread_map.c in /home/acme/bin/perf)
>   probe_perf:thread_map__new_str (on thread_map__new_str@...l/thread_map.c in /home/acme/bin/perf)
> [root@zoo ~]#
> 
> Some more goodies to have, please consider better compressing the output of successfully installed probes,
> Something like:
> 
> [root@zoo ~]# perf probe -x ~/bin/perf `perf probe -x ~/bin/perf -F  | grep __new | sed 's/^/-a /g' | sort -u`
> Added 46 new events:
>   probe_perf:call_path__new (on call_path__new in /home/acme/bin/perf)
>   probe_perf:call_path_root__new (on call_path_root__new in /home/acme/bin/perf)
>   probe_perf:call_return_processor__new (on call_return_processor__new in /home/acme/bin/perf)
> <SNIP>
> 
> You can now use them in all perf tools, e.g.:
> 
> 	perf record -e probe_perf:call_path_root__new -aR sleep 1
> 
> ------
> 
> Also that -l should output to stdout, so that we can grep it, also it would be nice if it -l worked
> like in perf list:
> 
> [root@zoo ~]# perf probe -l probe_perf:*
> Semantic error :There is non-digit char in line number.
>   Error: Command Parse Error.


Hmm, right. This should be fixed.

Thank you!


> [root@zoo ~]# 
> 
> Fails, but:
> 
> [root@zoo ~]# perf list *:*switch*
> 
> List of pre-defined events (to be used in -e):
> 
>   cfg80211:cfg80211_ch_switch_notify                 [Tracepoint event]
>   cfg80211:rdev_channel_switch                       [Tracepoint event]
>   mac80211:api_chswitch_done                         [Tracepoint event]
>   mac80211:drv_channel_switch                        [Tracepoint event]
>   mac80211:drv_channel_switch_beacon                 [Tracepoint event]
>   mac80211:drv_switch_vif_chanctx                    [Tracepoint event]
>   sched:sched_switch                                 [Tracepoint event]
> 
> [root@zoo ~]# 
> 
> Works :-)
> 
> - Arnaldo
> 


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@...achi.com


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