linux-kernel - Re: Function Profiler broken on today's linux-next

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Message-ID: <20140716145442.15f25ec3@gandalf.local.home>
Date:	Wed, 16 Jul 2014 14:54:42 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	<balbi@...com>
Cc:	<will.deacon@....com>, <mingo@...hat.com>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Subject: Re: Function Profiler broken on today's linux-next

On Wed, 16 Jul 2014 13:41:52 -0500
Felipe Balbi <balbi@...com> wrote:

> Hi,
> 
> On Wed, Jul 16, 2014 at 01:29:44PM -0500, Felipe Balbi wrote:
> > On Wed, Jul 16, 2014 at 01:24:13PM -0400, Steven Rostedt wrote:
> > > On Wed, 16 Jul 2014 11:41:42 -0500
> > > Felipe Balbi <balbi@...com> wrote:
> > > 
> > > 
> > > > .config attached. It's actually an ARM platform, I can help out with
> > > > testing anything you need.
> > > 
> > > In that case, can you see if it works under my repo?
> > > 
> > > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
> > > branch: ftrace/core
> > 
> > works fine, thanks. FWIW
> > 
> > Tested-by: Felipe Balbi <balbi@...com>
> 
> Actually it seems like it's not counting time properly if I run my test
> multiple times in a row:
> 
> # /root/testusb -t 1 -c 100000 -s 2048 -a
> # head -3 trace_stat/function0
>   Function                         Hit    Time                Avg           s^2
>   --------                         ---    ----                ---           ---
>   thread_interrupt               174876    166120839 us     949.935 us  3048498 us
> 
> # /root/testusb -t 1 -c 100000 -s 2048 -a
> # head -3 trace_stat/function0
>   Function                           Hit       Time                    Avg          s^2
>   --------                           ---       ----                    ---          ---
>   dwc3_thread_interrupt            286796    967267300 us         4190545199 us     3241109 us 
> 
> # /root/testusb -t 1 -c 100000 -s 2048 -a
> # head -3 trace_stat/function0
>   Function                              Hit      Time                 Avg               s^2
>     --------                            ---       ----                 ---              ---
>   dwc3_thread_interrupt               401346    642632072 us       1601.192 us     1194316 us 
> 
> and so on...
> 

Did it use to work? In other words, is this a regression, or just some
another bug?

-- Steve

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