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Date: Wed, 12 Aug 2009 13:03:07 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Lai Jiangshan <laijs@cn.fujitsu.com>,
       Steven Rostedt <rostedt@goodmis.org>,
       Peter Zijlstra <peterz@infradead.org>,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       Jiaying Zhang <jiayingz@google.com>, Martin Bligh <mbligh@google.com>,
       Li Zefan <lizf@cn.fujitsu.com>, Jason Baron <jbaron@redhat.com>,
       Masami Hiramatsu <mhiramat@redhat.com>
Subject: Re: [GIT PULL] tracing: Syscalls trace events + perf support
Message-ID: <20090812110307.GA806@elte.hu>
References: <1250016545-6601-1-git-send-email-fweisbec@gmail.com> <20090812091133.GA21655@elte.hu>
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one thing i noticed is that we dont seem to be catching 
compat syscalls properly:

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