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

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Date:	Tue, 17 Jan 2012 11:59:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	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

btw., i'd write the CONFIG_UPROBE_EVENT .config help text:

 This allows the user to add tracing events on top of userspace
 dynamic events (similar to tracepoints) on the fly via the
 traceevents interface. Those events can be inserted wherever 
 uprobes can probe, and record various registers.

 This option is required if you plan to use perf-probe 
 subcommand of perf tools on user space applications.

In a clearer form:

 This allows the user to add user-space dynamic events on the 
 fly, similar to tracepoints. These events can be inserted
 into just about any user-space code transparently, and can 
 record register state there on the fly, which is then used by
 instrumentation tools.

 This option is required if you plan to use the "perf probe"
 subcommand of the perf tool on user space applications.

Thanks,

	Ingo
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