linux-kernel - Re: [PATCH 6/6] x86: Allow disabling HW_BREAKPOINTS and PERF

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Date:	Tue, 8 Oct 2013 16:19:59 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Dave Jones <davej@...hat.com>, David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, peterz@...radead.org,
	Andi Kleen <ak@...ux.intel.com>, fweisbec@...il.com
Subject: Re: [PATCH 6/6] x86: Allow disabling HW_BREAKPOINTS and PERF_EVENTS

On Tue, Oct 08, 2013 at 09:36:13PM +0200, Ingo Molnar wrote:
> 
> Peter is working on it - but it's slow. Could you try to disable 
> sys_perf_open, ptrace and the NMI watchdog? No perf functionality should 
> be used in that case. If you disable CONFIG_FTRACE then no ftrace 
> functionality should be used.
> 

Dave,

The ftrace oops you've been seeing is from the function tracer, you don't
need to disable all of ftrace, just CONFIG_FUNCTION_TRACER (and anything
that selects it: CONFIG_STACK_TRACER).

-- Steve

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