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

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Date:	Tue, 15 Mar 2011 02:35:55 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Frank Ch. Eigler" <fche@...hat.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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

On Mon, 14 Mar 2011, Frank Ch. Eigler wrote:
> akpm wrote:
> 
> > [...]  How do you envisage these features actually get used?
> 
> Patch #20/20 in the set includes an ftrace-flavoured debugfs frontend.

And you really think that:

# cd /sys/kernel/debug/tracing/

# cat /proc/`pgrep  zsh`/maps | grep /bin/zsh | grep r-xp
00400000-0048a000 r-xp 00000000 08:03 130904 /bin/zsh

# objdump -T /bin/zsh | grep -w zfree
0000000000446420 g    DF .text  0000000000000012  Base        zfree

# echo 'p /bin/zsh:0x46420 %ip %ax' > uprobe_events

# cat uprobe_events
p:uprobes/p_zsh_0x46420 /bin/zsh:0x0000000000046420

> TODO: Documentation/trace/uprobetrace.txt

without a reasonable documentation how to use that is a brilliant
argument?

> Previous versions of the patchset included perf front-ends too, which
> are probably to be seen again.

Ahh, probably. What does that mean?

     And if that probably happens, what interface is that supposed to
     use?

	The above magic wrapped into perf ?

	Or some sensible implementation ?

Thanks,

	tglx
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