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Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
- From: Ingo Molnar <mingo at kernel dot org>
- To: Mark Wielaard <mjw at redhat dot com>
- Cc: Pekka Enberg <penberg at iki dot fi>, Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, "Frank Ch. Eigler" <fche at redhat dot com>, Pekka Enberg <penberg at kernel dot org>, Hemant Kumar <hkshaw at linux dot vnet dot ibm dot com>, LKML <linux-kernel at vger dot kernel dot org>, Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>, Peter Zijlstra <peterz at infradead dot org>, Oleg Nesterov <oleg at redhat dot com>, hegdevasant at linux dot vnet dot ibm dot com, Ingo Molnar <mingo at redhat dot com>, anton at redhat dot com, systemtap at sourceware dot org, Namhyung Kim <namhyung at kernel dot org>, aravinda at linux dot vnet dot ibm dot com, dsahern at gmail dot com, "yrl dot pp-manager dot tt at hitachi dot com" <yrl dot pp-manager dot tt at hitachi dot com>
- Date: Thu, 31 Oct 2013 11:57:59 +0100
- Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
- Authentication-results: sourceware.org; auth=none
- References: <20131023044511 dot 1886 dot 82571 dot stgit at hemant-fedora> <20131023050502 dot 1886 dot 15779 dot stgit at hemant-fedora> <CAOJsxLFKm3TxeTmGjbpr1r4sZ8fHcM481-5BM_Cq0J8hhtvBqQ at mail dot gmail dot com> <y0mbo2cs2oa dot fsf at fche dot csb> <5270D9F7 dot 3090105 at hitachi dot com> <5270F2DE dot 6040505 at iki dot fi> <1383216886 dot 6521 dot 5910 dot camel at bordewijk dot wildebeest dot org>
* Mark Wielaard <mjw@redhat.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