linux-kernel - Re: [RFC PATCH perf/core v2 16/16] perf probe: Accept %sdt and %cached event name

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Date:	Sun, 19 Jul 2015 19:53:59 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Jiri Olsa <jolsa@...nel.org>, Borislav Petkov <bp@...e.de>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH perf/core v2 16/16] perf probe: Accept %sdt and
 %cached event name

On Wed, Jul 15, 2015 at 06:15:44PM +0900, Masami Hiramatsu wrote:
> To improbe usability, support %[PROVIDER:]SDTEVENT format to
> add new probes on SDT and cached events.

Ah, you meant we can skip the provider if the event name is unique..


> 
> e.g.
>   ----
>   # perf probe -x /lib/libc-2.17.so  %lll_lock_wait_private

Maybe we can also skip the target path (-x) too in this case.

Thanks,
Namhyung


>   Added new event:
>     libc:lll_lock_wait_private (on %lll_lock_wait_private in
>   /usr/lib/libc-2.17.so)
> 
>   You can now use it in all perf tools, such as:
> 
>           perf record -e libc:lll_lock_wait_private -aR sleep 1
> 
>   # perf probe -l | more
>     libc:lll_lock_wait_private (on __lll_lock_wait_private+21
>    in /usr/lib/libc-2.17.so)
>   ----
> 
> Note that this is not only for SDT events, but also normal
> events with event-name.
> 
> e.g. define "myevent" on cache (-n doesn't add the real probe)
>   ----
>   # perf probe -x ./perf --cache -n --add 'myevent=dso__load $params'
>   ----
>   Reuse the "myevent" from cache as below.
>   ----
>   # perf probe -x ./perf %myevent
>   ----
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
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