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Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
- From: Namhyung Kim <namhyung at kernel dot org>
- To: Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>
- Cc: Pekka Enberg <penberg at iki dot fi>, Srikar Dronamraju <srikar at linux dot vnet dot ibm 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, aravinda at linux dot vnet dot ibm dot com
- Date: Tue, 29 Oct 2013 14:31:11 +0900
- Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
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Hi Masami,
On Tue, 29 Oct 2013 12:19:37 +0900, Masami Hiramatsu wrote:
> (2013/10/29 2:48), Pekka Enberg wrote:
>> For the 32-bit and 64-bit libc case, why cannot 'perf list'
>> by default print out something like:
>>
>> $ perf list
>>
>> libc:setjmp [SDT marker group]
>>
>> and provide a '--fully-qualified' command line option that:
>>
>> $ perf list --fully-qualified
>>
>> libc:setjmp => libc32:setjmp, libc64:setjmp [SDT marker group]
>> libc32:setjmp => libc:setjmp@/lib/libc.so.6 [SDT marker]
>> libc64:setjmp => libc:setjmp@/lib64/libc.so.6 [SDT marker]
>>
>> and then teach 'perf trace' to deal with SDT marker groups
>> where you trace two events, not one?
>
> Ah, that's a good idea. :)
> And it also is needed for another probe event because
> sometimes inlined functions have multiple instances.
> I'd like to fold them as one event group.
Yes, I'd love to see it as well. :)
Thanks,
Namhyung