linux-kernel - [QUESTION] trace_function_graph: consumed event may be invalid

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Message-ID: <4A49C96C.6070305@cn.fujitsu.com>
Date:	Tue, 30 Jun 2009 16:14:36 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [QUESTION] trace_function_graph: consumed event may be invalid


In get_return_for_leaf() {
	......
	ring_buffer_consume()
	......
	access to @curr->ent.pid
}

@curr is saved at consumed event, if this event is the last event
in the page, the ring_buffer may reuse the page. It will become invalid.

Is there any other code to ensure it valid when we `cat trace_pipe`?

Lai.


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