To: Andrew Morton <akpm@linux-foundation.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>, int-list-linux-mm@kvack.org,
        linux-mm@kvack.org, Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Christoph Hellwig <hch@infradead.org>,
        Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
        Andi Kleen <andi@firstfloor.org>, Oleg Nesterov <oleg@redhat.com>,
        Jim Keniston <jkenisto@linux.vnet.ibm.com>,
        SystemTap <systemtap@sources.redhat.com>,
        LKML <linux-kernel@vger.kernel.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [PATCH v2 2.6.38-rc8-tip 0/20]  0: Inode based uprobes
References: <20110314133403.27435.7901.sendpatchset@localhost6.localdomain6>
	<20110314163028.a05cec49.akpm@linux-foundation.org>
From: fche@redhat.com (Frank Ch. Eigler)
Date: Mon, 14 Mar 2011 21:13:25 -0400
In-Reply-To: <20110314163028.a05cec49.akpm@linux-foundation.org> (Andrew Morton's message of "Mon, 14 Mar 2011 16:30:28 -0700")
Message-ID: <y0maagxuqx6.fsf@fche.csb>
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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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