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

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Message-ID: <20131008155131.GA31975@redhat.com>
Date:	Tue, 8 Oct 2013 11:51:31 -0400
From:	Dave Jones <davej@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	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 08:59:38AM +0200, Ingo Molnar wrote:
 
 > You might want to concentrate your efforts from fighting perf 
 > functionality towards decreasing per tracepoint overhead instead,
 > without hurting kernel functionality and maintainability.
 
Making it easier to disable perf entirely would be desirable for one use case.
I can't do a trinity run for more than a few hours for the last few months
without hitting perf/ftrace bugs that no-one seems to be able to get their
heads around.

It would be useful if I could in the meantime find bugs in other parts of the
kernel by disabling all the affected code.
 
	Dave

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