linux-kernel - Re: [RFC PATCH v1 1/2] perf/sdt : Listing of SDT markers by perf

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Message-ID: <87ppmauwza.fsf@sejong.aot.lge.com>
Date:	Wed, 26 Feb 2014 16:58:01 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Hemant Kumar <hkshaw@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com,
	peterz@...radead.org, oleg@...hat.com,
	hegdevasant@...ux.vnet.ibm.com, mingo@...hat.com, anton@...hat.com,
	systemtap@...rceware.org, masami.hiramatsu.pt@...achi.com,
	aravinda@...ux.vnet.ibm.com, penberg@....fi
Subject: Re: [RFC PATCH v1 1/2] perf/sdt : Listing of SDT markers by perf

Hi Hemant,

On Tue, 25 Feb 2014 14:33:37 +0530, Hemant Kumar wrote:
> On 02/25/2014 12:26 PM, Namhyung Kim wrote:
>>> +	/* Translation from file representation to memory representation */
>>> +	if (gelf_xlatetom(*elf, &dst, &src,
>>> +			  elf_getident(*elf, NULL)[EI_DATA]) == NULL)
>> Do we really need this xlate function?  It seems elf_getdata() already
>> did necessary conversions so only thing we need to do is checking its
>> class and read out the addresses in a proper length, no?
>>
>
> Hmm, alright. I thought the conversion was necessary for cross
> developed binaries.
> But I guess elf_getdata() should do all these conversions. Will remove that.

Looking at the source, it seems we still need to xlate() anyway.  The
conversion function (elf_cvt_note) only handles the header part since it
cannot know what the content is.

But obviously we cannot enable/disable the marker as we cannot run the
cross-built binary - it only can be used to show the list of SDT markers
in the binary.  Or else, we can simply deny to do it..

Thanks,
Namhyung
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