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

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Message-ID: <5254313F.4030409@gmail.com>
Date:	Tue, 08 Oct 2013 10:22:23 -0600
From:	David Ahern <dsahern@...il.com>
To:	Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	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 10/8/13 9:51 AM, Dave Jones wrote:
> 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.

Looks like trinity has an exclude syscall option. Seems like that option 
can be used to avoid perf_event_open (haven't tried though).

David

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