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From: Namhyung Kim <namhyung@kernel.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, Namhyung Kim <namhyung.kim@lge.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Hyeoncheol Lee <cheol.lee@lge.com>,
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        "zhangwei\(Jovi\)" <jovi.zhangwei@huawei.com>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: [PATCHSET 00/13] tracing/uprobes: Add support for more fetch methods (v6)
References: <1383029621-7384-1-git-send-email-namhyung@kernel.org>
	<20131102155458.GA6981@redhat.com> <87ob60366m.fsf@sejong.aot.lge.com>
	<87fvrc35kj.fsf@sejong.aot.lge.com> <20131104155131.GD4440@redhat.com>
	<20131104162229.GA8921@redhat.com> <87mwlj1tm7.fsf@sejong.aot.lge.com>
	<20131105163341.GB2460@redhat.com>
Date: Wed, 06 Nov 2013 17:34:45 +0900
In-Reply-To: <20131105163341.GB2460@redhat.com> (Oleg Nesterov's message of
	"Tue, 5 Nov 2013 17:33:41 +0100")
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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