linux-kernel - Re: [PATCH v9 3.2 7/9] tracing: uprobes trace

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Message-ID: <20120117122741.GA19219@elte.hu>
Date:	Tue, 17 Jan 2012 13:27:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	"Paul E. McKenney" <paulmck@...ibm.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Anton Arapov <anton@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH v9 3.2 7/9] tracing: uprobes trace_event interface


a couple of other 'perf probe' suggestions:

i think the 'perf probe' UI should be streamlined.

Right now we have kprobes assumptions like this syntax:

  perf probe <kernel_symbol>

will add a probe.

That is nonsensical once we merge uprobes, as i'd expect much 
more developers to be interested in user-space symbols than 
kernel-space symbols.

So we could change this syntax and add the more intuitive:

  perf probe add ...
  perf probe del ...
  perf probe list

Variants. Also, the -x syntax isnt particularly intuitive either 
- it should be a 'perf probe add ...' variant.

If someone uses the old syntax it will produce a meaningful 
error message.

Thanks,

	Ingo
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