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

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


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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