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Re: [RFC] perf-cache command interface design
- From: Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>
- To: Namhyung Kim <namhyung at kernel dot org>
- Cc: Arnaldo Carvalho de Melo <acme at redhat dot com>, Hemant Kumar <hemant at linux dot vnet dot ibm dot com>, linux-kernel at vger dot kernel dot org, srikar at linux dot vnet dot ibm dot com, peterz at infradead dot org, oleg at redhat dot com, hegdevasant at linux dot vnet dot ibm dot com, mingo at redhat dot com, systemtap at sourceware dot org, aravinda at linux dot vnet dot ibm dot com, penberg at iki dot fi, brendan dot d dot gregg 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: Tue, 18 Nov 2014 20:16:12 +0900
- Subject: Re: [RFC] perf-cache command interface design
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(2014/11/18 13:51), Namhyung Kim wrote:
> On Tue, 18 Nov 2014 07:09:02 +0900, Masami Hiramatsu wrote:
>> (2014/11/17 12:17), Masami Hiramatsu wrote:
>>> (2014/11/17 12:08), Namhyung Kim wrote:
>>>> I prefer this too. But I'd like make the 'add' part a subcommand rather
>>>> than option like we do in perf kmem/kvm/list/lock/mem/sched ... And it
>>>> can handle multiple files at once. What about this?
>>>>
>>>> perf cache add [--elf|--sdt|--probe <spec>] <binary> [<binary>...]
>>>
>>> OK, that's good to me. And I think --elf/--sdt is meaningless.
>>> Only --probe option is required, since we can scan the elf file to
>>> add sdt cache when adding elf binary :)
>>
>> BTW, what should we do if we put the probe cache on current running kernel?
>>
>> perf cache add --probe <probe-spec>
>>
>> and have no binary argument, is it OK?
>
> Hmm.. what about passing /proc/kallsyms and/or /boot/vmlinux for that?
Yeah, but I think it is just optional (as same as perf probe's -k option),
we can skip that too.
> Now I found that we need to special-case the kallsyms non-ELF file :)
So, I wonder that we'd better use "bu/ildid/dso" instead of "bu/ildid/elf".
Thank you,
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com