linux-kernel - Re: [PATCH -tip v14 08/12] tracing: add kprobe-based event tracer

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Message-ID: <20090819012306.GJ5231@nowhere>
Date:	Wed, 19 Aug 2009 03:23:08 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	kvm <kvm@...r.kernel.org>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Avi Kivity <avi@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jason Baron <jbaron@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	PrzemysławPawełczyk <przemyslaw@...elczyk.it>,
	Roland McGrath <roland@...hat.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Vegard Nossum <vegard.nossum@...il.com>
Subject: Re: [PATCH -tip v14 08/12] tracing: add kprobe-based event tracer

On Thu, Aug 13, 2009 at 04:35:11PM -0400, Masami Hiramatsu wrote:
> Add kprobes-based event tracer on ftrace.
> 
> This tracer is similar to the events tracer which is based on Tracepoint
> infrastructure. Instead of Tracepoint, this tracer is based on kprobes
> (kprobe and kretprobe). It probes anywhere where kprobes can probe(this
>  means, all functions body except for __kprobes functions).
> 
> Similar to the events tracer, this tracer doesn't need to be activated via
> current_tracer, instead of that, just set probe points via
> /sys/kernel/debug/tracing/kprobe_events. And you can set filters on each
> probe events via /sys/kernel/debug/tracing/events/kprobes/<EVENT>/filter.
> 
> This tracer supports following probe arguments for each probe.
> 
>   %REG  : Fetch register REG
>   sN    : Fetch Nth entry of stack (N >= 0)
>   sa    : Fetch stack address.
>   @ADDR : Fetch memory at ADDR (ADDR should be in kernel)
>   @SYM[+|-offs] : Fetch memory at SYM +|- offs (SYM should be a data symbol)
>   aN    : Fetch function argument. (N >= 0)
>   rv    : Fetch return value.
>   ra    : Fetch return address.
>   +|-offs(FETCHARG) : fetch memory at FETCHARG +|- offs address.
> 
> See Documentation/trace/kprobetrace.txt for details.
> 
> Changes from v13:
>  - Support 'sa' for stack address.
>  - Use call->data instead of container_of() macro.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
> Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> Cc: Avi Kivity <avi@...hat.com>
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: Frank Ch. Eigler <fche@...hat.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Jason Baron <jbaron@...hat.com>
> Cc: Jim Keniston <jkenisto@...ibm.com>
> Cc: K.Prasad <prasad@...ux.vnet.ibm.com>
> Cc: Lai Jiangshan <laijs@...fujitsu.com>
> Cc: Li Zefan <lizf@...fujitsu.com>
> Cc: Przemysław Pawełczyk <przemyslaw@...elczyk.it>
> Cc: Roland McGrath <roland@...hat.com>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Tom Zanussi <tzanussi@...il.com>
> Cc: Vegard Nossum <vegard.nossum@...il.com>
> ---
> 
>  Documentation/trace/kprobetrace.txt |  139 ++++


I'll probably split this commit to have the first version of the
documentation as a separate patch in order to lighten this.

Frederic.

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