This is the mail archive of the
systemtap@sourceware.org
mailing list for the systemtap project.
Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
- From: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
- To: Pekka Enberg <penberg at iki dot fi>
- Cc: Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, Hemant Kumar <hkshaw at linux dot vnet dot ibm dot com>, LKML <linux-kernel at vger dot kernel dot org>, 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
- Date: Mon, 28 Oct 2013 23:01:52 +0530
- 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> <526E4940 dot 8000608 at hitachi dot com> <526E5BA5 dot 7050103 at iki dot fi> <20131028141152 dot GA1040 at linux dot vnet dot ibm dot com> <526E72EC dot 9060400 at iki dot fi>
- Reply-to: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
> >
> >But what if a system has both 32 bit libc and 64 bit libc?
> >Wont we could end up with 2 libc:setjmp?
> >Should we give some more intelligence into perf to choose the 64 bit
> >libc over 32 bit one?
>
> You can just trace both of them by default, no?
>
There has to be a one to one association with the event name and its
mapping. Every event name will finally map to a unique inode and an
offset.
One option would be for perf to look at these markers and have a
different event name for similar markers in different executables.
--
Thanks and Regards
Srikar Dronamraju