linux-kernel - Re: [PATCH 2/2] perfcounters: print a sorted summary of annotated overhead lines

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Date:	Sat, 13 Jun 2009 13:02:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 2/2] perfcounters: print a sorted summary of annotated
	overhead lines


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> It's can be very annoying to scroll down perf annotated output
> until we find relevant overhead.
> 
> Using the -l option, you can now have a small summary sorted per
> overhead in the beginning of the output.
> 
> Example:
> 
> ./perf annotate -l -k ../../vmlinux -s __lock_acquire
> 
> Sorted summary for file ../../vmlinux
> ----------------------------------------------
> 
>    12.04 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1653
>     4.61 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1740
>     3.77 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1775
>     3.56 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1653
>     2.93 /home/fweisbec/linux/linux-2.6-tip/arch/x86/include/asm/irqflags.h:15
>     2.83 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2545
>     2.30 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2594
>     2.20 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2388
>     2.20 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:730
>     2.09 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:730
>     2.09 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:138
>     1.88 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2548
>     1.47 /home/fweisbec/linux/linux-2.6-tip/arch/x86/include/asm/irqflags.h:15
>     1.36 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2594
>     1.36 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:730
>     1.26 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1654
>     1.26 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1653

Nice!

I'm wondering how hard it would be to add wildcard support to the 
symbol matching, say:

  perf annotate "sys_*"               # Annotate all syscalls
  perf annotate "sched*"              # All scheduler functions
  perf annotate "*"                   # All symbols we know about

It would be slower, obviously - but pretty useful as well.

Also, perhaps an 'annotate top 10 overhead functions':

  perf annotate --top 10

Would be popular too ...

	Ingo
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