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

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Date:	Tue, 18 Nov 2014 13:51:26 +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

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?
Now I found that we need to special-case the kallsyms non-ELF file :)

Thanks,
Namhyung
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