linux-kernel - Re: [PATCH v2 2.6.38-rc8-tip 0/20] 0: Inode based uprobes

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Message-ID: <y0maagxuqx6.fsf@fche.csb>
Date:	Mon, 14 Mar 2011 21:13:25 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	int-list-linux-mm@...ck.org, linux-mm@...ck.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andi Kleen <andi@...stfloor.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	SystemTap <systemtap@...rces.redhat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 2.6.38-rc8-tip 0/20]  0: Inode based uprobes


akpm wrote:

> [...]  How do you envisage these features actually get used?

Patch #20/20 in the set includes an ftrace-flavoured debugfs frontend.
Previous versions of the patchset included perf front-ends too, which
are probably to be seen again.

> For example, will gdb be modified?  Will other debuggers be modified
> or written? [...]

The code is not currently useful to gdb.  Perhaps ptrace or an
improved userspace ABI can get access to it in the form of a
breakpoint-management interface, though this inode+offset
style of uprobe addressing would require adaptation to the
process-virtual-address style used by debugging APIs.

- FChE
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