linux-kernel - Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

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Message-ID: <20131031105759.GB12066@gmail.com>
Date:	Thu, 31 Oct 2013 11:57:59 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mark Wielaard <mjw@...hat.com>
Cc:	Pekka Enberg <penberg@....fi>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Pekka Enberg <penberg@...nel.org>,
	Hemant Kumar <hkshaw@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	hegdevasant@...ux.vnet.ibm.com, Ingo Molnar <mingo@...hat.com>,
	anton@...hat.com, systemtap@...rceware.org,
	Namhyung Kim <namhyung@...nel.org>,
	aravinda@...ux.vnet.ibm.com, dsahern@...il.com,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:


* Mark Wielaard <mjw@...hat.com> wrote:

> On Wed, 2013-10-30 at 13:51 +0200, Pekka Enberg wrote:
> > On 10/30/13 12:05 PM, Masami Hiramatsu wrote:
> > > To find all system libraries, we can use ldconfig.
> > >
> > > $ ldconfig --print-cache
> > >
> > > shows what dynamic libraries will be loaded. On my own laptop (running
> > > ubuntu13.04) shows ~1000 libs.
> > 
> > Good point. That definitely narrows down the scanned set.
> 
> It is fast. But that would miss the various libjvm.so variants for 
> example. Or other programs, like libreoffice, which have SDT 
> probes in their internal shared libraries that aren't in the 
> default ldconfig paths.

I suppose those Java libraries ought to show up in 
/etc/prelink.cache though, right?

Thanks,

	Ingo
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