linux-kernel - Re: [RFC] perf-cache command interface design

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Message-ID: <546B2A7C.5040908@hitachi.com>
Date:	Tue, 18 Nov 2014 20:16:12 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com,
	peterz@...radead.org, oleg@...hat.com,
	hegdevasant@...ux.vnet.ibm.com, mingo@...hat.com,
	systemtap@...rceware.org, aravinda@...ux.vnet.ibm.com,
	penberg@....fi, brendan.d.gregg@...il.com,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [RFC] perf-cache command interface design

(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@...achi.com


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