linux-kernel - Re: perf report fractal output issue

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Message-ID: <20091015122839.GA4960@nowhere>
Date:	Thu, 15 Oct 2009 14:28:48 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	mingo@...e.hu, paulus@...ba.org, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org
Subject: Re: perf report fractal output issue

On Thu, Oct 15, 2009 at 09:57:26AM +1100, Anton Blanchard wrote:
> 
> Hi,
> 
> I noticed a problem where I wasn't always getting callchains:
> 
> # perf report
>     98.47%  lock1_processes  [kernel]                [k] .lock_kernel
> 
>      0.91%  lock1_processes  [kernel]                [k] .fput
> 
> 
> But a flat output confirmed the data is there:
> 
> # perf report -g flat
>     98.47%  lock1_processes  [kernel]                             [k] .lock_kernel
>             98.47%
>                 .lock_kernel
>                 .__posix_lock_file
>                 (nil)
>                 .fcntl_setlk
>                 .sys_fcntl
>                 syscall_exit
>                 0xfffb7d04844
>                 .testcase
>                 .testcase
>                 .affinitize
>                 .new_task
>                 .main
>                 0xfffb7c4933c
>                 0xfffb7c4955c
>                 (nil)
> 
> It looks like callchain__fprintf_graph() only prints the callchain if we
> have at least one rb entry at the top. In my case all the associated
> backtraces are identical so I assume we dont have to do any splitting.
> 
> Anton


Hmm, could you please send me a perf.data where you can see that?
Does that only happen on powerpc?


Thanks.

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