linux-kernel - Re: [PATCH] watchdog: Make sure the watchdog thread gets CPU on loaded system

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Message-ID: <1331809239.18960.168.camel@twins>
Date:	Thu, 15 Mar 2012 12:00:39 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Mandeep Singh Baines <msb@...omium.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Don Zickus <dzickus@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] watchdog: Make sure the watchdog thread gets CPU on
 loaded system

On Wed, 2012-03-14 at 18:45 -0700, Mandeep Singh Baines wrote:
> You could make MAX_RT_PRIO greater than MAX_USER_RT_PRIO but that
> might
> have some impact on real-time applications. A simple one-line patch:
> 
> - #define MAX_RT_PRIO           MAX_USER_RT_PRIO
> + #define MAX_RT_PRIO           (MAX_USER_RT_PRIO + 1)
> 
> would prevent user-space from causing a false lockup detection.

We're so not going to muck with the fifo priorities just for this stupid
soft watchdog,.. I already hate that I can't disable the piece of crap,
making it more involved is just really not going to happen.


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