linux-kernel - Re: [PATCH] tracing: mark get_parent

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Message-ID: <49E2D8E3.4060708@cn.fujitsu.com>
Date:	Mon, 13 Apr 2009 14:17:07 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <srostedt@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing: mark get_parent_ip() notrace

Frederic Weisbecker wrote:
> On Thu, Apr 02, 2009 at 02:18:25PM +0800, Lai Jiangshan wrote:
>> Impact: remove redundancy tracing log
>>
>> When tracer is "function" or "function_graph", too much
>> "get_parent_ip" are recorded in ring_buffer.
> 
> 
> Thanks, indeed this get_parent_ip was a bit harrassing
> in the traces, though I still don't understand why it is
> called so often.
> 
> Anyway, tracing it seems to me not useful.
> 
> Acked-by: Frederic Weisbecker <fweisbec@...il.com>
> 
> 

Hi, Ingo,
	Could you apply this fix?

get_parent_ip() is a helper function for ftace, and it is called
by preempt_disable() and preempt_enable(), so it is occurred very
often.

Lai.



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