linux-kernel - Re: [PATCH] ftrace: Remove use of control list and ops

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Message-ID: <20151202091533.1eea65cf@gandalf.local.home>
Date:	Wed, 2 Dec 2015 09:15:33 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] ftrace: Remove use of control list and ops

On Wed, 2 Dec 2015 08:59:11 +0100
Jiri Olsa <jolsa@...hat.com> wrote:

> > -	op->func(ip, parent_ip, op, regs);
> > +	preempt_disable_notrace();  
> 
> I was wondering about not disabling preemption in the original
> ftrace_ops_recurs_func function.. thats why I added new one ;-)

Yeah, I paused on that too. But then I realized that pretty much all
callers of function tracing disable preemption too, so it shouldn't
cause really any more overhead.

-- Steve
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