linux-kernel - Re: [PATCH perf/core v13 06/15] perf buildid-cache: Scan and import user SDT events to probe cache

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Message-Id: <20160705110810.ff660dea69632954ae87643b@kernel.org>
Date:	Tue, 5 Jul 2016 11:08:10 +0900
From:	Masami Hiramatsu <mhiramat@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>
Subject: Re: [PATCH perf/core v13 06/15] perf buildid-cache: Scan and import
 user SDT events to probe cache

On Fri, 1 Jul 2016 15:22:01 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> Em Fri, Jul 01, 2016 at 05:04:10PM +0900, Masami Hiramatsu escreveu:
> > From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> > 
> > perf buildid-cache --add <binary> scans given binary and add
> > the SDT events to probe cache. "sdt_" prefix is appended for
> > all SDT providers to avoid event-name clash with other pre-defined
> > events. It is possible to use the cached SDT events as other cached
> > events, via perf probe --add "sdt_<provider>:<event>=<event>".
> > 
> > e.g.
> >   ----
> >   # perf buildid-cache --add /lib/libc-2.17.so
> >   # perf probe --cache --list | head -n 5
> >   /usr/lib/libc-2.17.so (a6fb821bdf53660eb2c29f778757aef294d3d392):
> >   sdt_libc:setjmp=setjmp
> >   sdt_libc:longjmp=longjmp
> >   sdt_libc:longjmp_target=longjmp_target
> >   sdt_libc:memory_heap_new=memory_heap_new
> >   # perf probe -x /usr/lib/libc-2.17.so \
> >     -a sdt_libc:memory_heap_new=memory_heap_new
> 
> Why not remove the need for that build-cache --add? I.e. go straight to:
> 
>   perf probe -x /usr/lib/libc-2.17.so -a sdt_libc:memory_heap_new=memory_heap_new
> 
> And all the various steps above be done automagically?

Ah, this has been done :) Yes, you can do that already.

See commit dd975497ad ("perf probe: Introduce perf_cache interfaces")
which introduces probe cache and it automatically add the target
binary to the buildid-cache.

Thank you,


-- 
Masami Hiramatsu <mhiramat@...nel.org>