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

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Date:	Wed, 12 Aug 2009 13:03:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
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


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
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