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

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Message-ID: <87oas6ttf8.fsf@sejong.aot.lge.com>
Date:	Mon, 17 Nov 2014 12:08:59 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
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\@hitachi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [RFC] perf-cache command interface design

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>...]


Thanks,
Namhyung
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