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

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Message-ID: <20131109152313.GA14630@redhat.com>
Date:	Sat, 9 Nov 2013 16:23:13 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung.kim@....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 11/09, Masami Hiramatsu wrote:
>
> In that case, I suggest you to use "@+addr" for the relative address,
> since that is an offset, isn't that? :)

Agreed, @+addr looks better!

> BTW, it seems that @addr syntax is hard to use for uprobes, because
> current uprobes is based on a binary, not a process, we cannot specify
> which process is probed when we define it.

Yes, exactly. That is why we suggest that user-space should pass the
ip-relative address (actually offset). This should hopefully solve all
problems with relocations.

Oleg.

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