linux-kernel - Re: [PATCH 0/4] workqueue_trace: Add max execution time mesurement for per worklet

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Message-ID: <alpine.DEB.2.00.0904290942000.8066@gandalf.stny.rr.com>
Date:	Wed, 29 Apr 2009 09:43:19 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Zhaolei <zhaolei@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	Tom Zanussi <tzanussi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/4] workqueue_trace: Add max execution time mesurement
 for per worklet


On Wed, 29 Apr 2009, Frederic Weisbecker wrote:

> On Wed, Apr 29, 2009 at 12:06:16AM -0700, Andrew Morton wrote:
> > What is the meaning of M_EXECus?  Mean execution time in microseconds,
> > I assume?  I wonder if that is sufficiently high resolution nowadays.
> 
> 
> It's the maximum execution time encountered for a given worklet.
> I also have a small patch, about ready, to get the average.
> 
>  
> > You'll note that all the functions are reported as "foo+0x0/0xN". 
> > There is a way of suppressing the unneeded and unuseful "+0x0/0xN",
> > but I forget what it is and the comments over lib/vsprintf.c:pointer()
> > didn't help.  I think it's %pS.
> 
> 
> I don't know any way to perform this.
> %pF and %pS will act pretty much the same, except:
> 
> Extract from lib/vsprintf.c:
> 
>  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
>  * function pointers are really function descriptors, which contain a
>  * pointer to the real address.
> 
> But the output formatting is the same: address, offset, size, modname.

I could not find any way to remove it, thus I wrote my own version of %pF 
to get rid of the +0x0/0xN notations in the output for ftrace.

-- Steve
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