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

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Message-ID: <546A71FE.5080500@hitachi.com>
Date:	Tue, 18 Nov 2014 07:09:02 +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: Re: Re: [RFC] perf-cache command interface design

(2014/11/17 12:17), Masami Hiramatsu wrote:
> (2014/11/17 12:08), Namhyung Kim wrote:
>> Hi Masami,
>>
>> On Thu, 13 Nov 2014 00:25:57 +0900, Masami Hiramatsu wrote:
>>> (2014/11/11 22:10), Arnaldo Carvalho de Melo wrote:
>>>> What I meant was, what is wrong with replacing:
>>>>
>>>>  perf cache --probe <SPEC>  # for the current kernel
>>>>
>>>> With:
>>>>
>>>>  perf cache --add <PROBE-SPEC> # for the current kernel
>>>>
>>>> And have it figure out that what is being added is a probe and do the
>>>> right thing?
>>>
>>> As I've said previously, PROBE-SPEC can be same as FILES (imagine that a binary
>>> file which has same name function in the kernel.)
>>> Moreover, PROBE-SPEC requires the target binary(or kernel module) except for
>>> kernel probes. In that case, anyway we need -x or -m options with file-path
>>> for --add, that is very strange.
>>>
>>> e.g.
>>>
>>> For me,
>>>
>>>  perf cache --add ./binary --probe '*'
>>>
>>> looks more natural than
>>>
>>>  perf cache --add '*' -exec ./binary
>>>
>>> since in other cases(sdt/elf), we'll just do
>>>
>>>  perf cache --add ./binary
>>
>> 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?

Thanks,

-- 
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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