linux-kernel - Re: [PATCH v3 02/12] tracing: fix irqs-off tag display in syscall tracing

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Date:	Tue, 02 Jul 2013 19:25:24 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>
Cc:	fweisbec@...il.com, mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 02/12] tracing: fix irqs-off tag display in syscall
 tracing

On Wed, 2013-04-10 at 11:26 +0800, zhangwei(Jovi) wrote:
> From: "zhangwei(Jovi)" <jovi.zhangwei@...wei.com>
> 
> Now all syscall tracing irqs-off tag is wrong,
> syscall enter entry doesn't disable irq.
> 
>  [root@...i tracing]#echo "syscalls:sys_enter_open" > set_event
>  [root@...i tracing]# cat trace
>  # tracer: nop
>  #
>  # entries-in-buffer/entries-written: 13/13   #P:2
>  #
>  #                              _-----=> irqs-off
>  #                             / _----=> need-resched
>  #                            | / _---=> hardirq/softirq
>  #                            || / _--=> preempt-depth
>  #                            ||| /     delay
>  #           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
>  #              | |       |   ||||       |         |
>        irqbalance-513   [000] d... 56115.496766: sys_open(filename: 804e1a6, flags: 0, mode: 1b6)
>        irqbalance-513   [000] d... 56115.497008: sys_open(filename: 804e1bb, flags: 0, mode: 1b6)
>          sendmail-771   [000] d... 56115.827982: sys_open(filename: b770e6d1, flags: 0, mode: 1b6)
> 
> The reason is syscall tracing doesn't record irq_flags into buffer.
> Fix this after this patch:
> 
>  [root@...i tracing]#echo "syscalls:sys_enter_open" > set_event
>  [root@...i tracing]# cat trace
>  # tracer: nop
>  #
>  # entries-in-buffer/entries-written: 14/14   #P:2
>  #
>  #                              _-----=> irqs-off
>  #                             / _----=> need-resched
>  #                            | / _---=> hardirq/softirq
>  #                            || / _--=> preempt-depth
>  #                            ||| /     delay
>  #           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
>  #              | |       |   ||||       |         |
>        irqbalance-514   [001] ....    46.213921: sys_open(filename: 804e1a6, flags: 0, mode: 1b6)
>        irqbalance-514   [001] ....    46.214160: sys_open(filename: 804e1bb, flags: 0, mode: 1b6)
>             <...>-920   [001] ....    47.307260: sys_open(filename: 4e82a0c5, flags: 80000, mode: 0)
> 
> Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@...wei.com>
> ---

I'll pull this one in for 3.11 and mark for stable.

Thanks,

-- Steve


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