linux-kernel - Re: [PATCHSET 00/13] tracing/uprobes: Add support for more fetch methods (v6)

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Message-ID: <878ux2x716.fsf@sejong.aot.lge.com>
Date:	Wed, 06 Nov 2013 17:34:45 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hyeoncheol Lee <cheol.lee@....com>,
	Hemant Kumar <hkshaw@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"zhangwei\(Jovi\)" <jovi.zhangwei@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCHSET 00/13] tracing/uprobes: Add support for more fetch methods (v6)

On Tue, 5 Nov 2013 17:33:41 +0100, Oleg Nesterov wrote:
> On 11/05, Namhyung Kim wrote:
>>
>> On Mon, 4 Nov 2013 17:22:29 +0100, Oleg Nesterov wrote:
>> >
>> > So probably I was wrong and this all needs more thinking. Damn.
>>
>> :)
>
> Don't laugh at me ;)

:)

(And now I'm feeling guilty..)

>
>> > Perhaps we really need to pass @file/offset, but it is not clear what
>> > we can do with bss/anon-mapping.
>>
>> The @file/offset should work with bss since data in bss is accessed via
>> an offset in the program,
>
> Yes, yes, but it is still not clear to me how we can identify the "right"
> vma which doesn't cover the .bss address but can be used to calculate the
> offset.

Yes, that's the open problem for the cross-fetch.

Thanks,
Namhyung
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