linux-kernel - Re: [Patch 11/11] ftrace plugin for kernel symbol tracing using HW Breakpoint interfaces

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Message-ID: <20090307182106.GA7524@in.ibm.com>
Date:	Sat, 7 Mar 2009 23:51:06 +0530
From:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	mingo@...e.hu, Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [Patch 11/11] ftrace plugin for kernel symbol tracing using HW
	Breakpoint interfaces - v2

On Sat, Mar 07, 2009 at 11:53:46PM +0900, KOSAKI Motohiro wrote:
> Hi
> 
> > This patch adds an ftrace plugin to detect and profile memory access over
> > kernel variables. It uses HW Breakpoint interfaces to 'watch memory
> > addresses.
> > 
> > Signed-off-by: K.Prasad <prasad@...ux.vnet.ibm.com> 
> > ---
> >  kernel/trace/Kconfig          |    6 
> >  kernel/trace/Makefile         |    1 
> >  kernel/trace/trace.h          |   16 +
> >  kernel/trace/trace_ksym.c     |  448 ++++++++++++++++++++++++++++++++++++++++++
> >  kernel/trace/trace_selftest.c |   36 +++
> >  5 files changed, 507 insertions(+)
> 
> Could you please update Documentation/ftrace.txt?
> I guess many user interesting this patch. :)
>

Sure. We have plans for a documentation file for the hardware breakpoint
interfaces (something like Documentation/hw_breakpoint.txt). I shall
update the Documentation/ftrace.txt with usage details for the kernel
symbol tracing plugin along with them.

Thanks,
K.Prasad
 
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