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Date: Sun, 22 Mar 2009 16:06:57 +0100
From: Ingo Molnar <mingo@elte.hu>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 0/5] [GIT PULL] updates for tip/tracing/ftrace
Message-ID: <20090322150657.GA17415@elte.hu>
References: <20090320195414.GA24129@elte.hu> <20090320204848.GA6044@nowhere> <alpine.DEB.2.00.0903201705380.13615@gandalf.stny.rr.com> <20090321100129.GC7201@elte.hu> <20090321165804.GA21366@elte.hu> <alpine.DEB.2.00.0903211323560.13615@gandalf.stny.rr.com> <20090321190746.GC7148@linux.vnet.ibm.com> <20090321200919.GA23992@elte.hu> <20090321210154.GD7148@linux.vnet.ibm.com> <20090322142409.GA3279@elte.hu>
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one thing to note is:

 <EOI>  [<ffffffff802b78ad>] ? ftrace_likely_update+0x1f/0x27
 [<ffffffff8022cf88>] ? prepare_ftrace_return+0x3c/0x158
 [<ffffffff8022d070>] ? prepare_ftrace_return+0x124/0x158
 [<ffffffff8020c776>] ? ftrace_graph_caller+0x46/0x6d
 [<ffffffff802a2cd8>] ? jhash+0x9/0x1e6
 [<ffffffff802a30d9>] ? get_tracepoint+0x30/0x7f
 [<ffffffff8020c79d>] ? return_to_handler+0x0/0x73
 [<ffffffff8020db1c>] call_softirq+0x1c/0x28

the branch profiler should be disabled inside ftrace ...

	Ingo