linux-kernel - Re: [GIT PULL] tracing: Syscalls trace events + perf support

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Date:	Wed, 12 Aug 2009 13:33:09 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Jason Baron <jbaron@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [GIT PULL] tracing: Syscalls trace events + perf support

On Wed, Aug 12, 2009 at 01:03:07PM +0200, Ingo Molnar wrote:
> 
> one thing i noticed is that we dont seem to be catching 
> compat syscalls properly:


Oh right. While looking at fs/compat.c, it seems most of the
compat syscalls haven't been defined through the SYSCALL_DEFINE
macro.

Grr...

Frederic.


 
> phoenix:~/linux/linux/tools/perf> perf stat -e 
> syscalls:sys_enter_read -e syscalls:sys_enter_write -e 
> syscalls:sys_enter_mmap ~/hackbench 10
> Time: 0.236
> 
>  Performance counter stats for '/home/mingo/hackbench 10':
> 
>               0  syscalls:sys_enter_read 
>               0  syscalls:sys_enter_write
>               0  syscalls:sys_enter_mmap 
> 
>     0.270062020  seconds time elapsed
> 
> phoenix:~/linux/linux/tools/perf> file ~/hackbench 
> /home/mingo/hackbench: ELF 32-bit LSB executable, Intel 
> 80386, version 1 (SYSV), dynamically linked (uses shared 
> libs), for GNU/Linux 2.2.5, not stripped
> phoenix:~/linux/linux/tools/perf> uname -a
> Linux phoenix 2.6.31-rc5-tip #3 SMP Wed Aug 12 12:50:38 CEST 
> 2009 x86_64 x86_64 x86_64 GNU/Linux
> 
> 
> phoenix:~> perf stat -e syscalls:sys_enter_read -e 
> syscalls:sys_enter_write -e syscalls:sys_enter_mmap 
> ~/hackbench64 10
> Running with 10*40 (== 400) tasks.
> Time: 0.199
> 
>  Performance counter stats for '/home/mingo/hackbench64 10':
> 
>          400402  syscalls:sys_enter_read 
>          400403  syscalls:sys_enter_write
>              12  syscalls:sys_enter_mmap 
> 
>     0.247919263  seconds time elapsed
> 
> phoenix:~> file hackbench64 
> hackbench64: ELF 64-bit LSB executable, x86-64, version 1 
> (SYSV), dynamically linked (uses shared libs), for GNU/Linux 
> 2.6.9, not stripped
> 
> 	Ingo

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