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Re: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
- From: Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>
- To: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
- Cc: Pekka Enberg <penberg at iki dot fi>, 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: Tue, 29 Oct 2013 11:51:46 +0900
- Subject: Re: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
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- 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> <20131028173152 dot GB1040 at linux dot vnet dot ibm dot com>
(2013/10/29 2:31), Srikar Dronamraju wrote:
>>>
>>> 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.
Or, another idea is introducing hidden event group which
automatically merges those similar markers and shows
as one event alias name. :)
Thank you,
--
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com