linux-kernel - Re: [PATCH] tty, add kref to sysrq handlers

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Date:	Thu, 19 Jul 2012 10:06:10 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>, lwoodman@...hat.com,
	jbaron@...hat.com
Subject: Re: [PATCH] tty, add kref to sysrq handlers

On Tue, Jun 12, 2012 at 11:22:02AM -0400, Prarit Bhargava wrote:
> [This seems to have been missed ... sending again]
> 
> On a large system with a large number of tasks, the output of
> 
> echo t > /proc/sysrq-trigger
> 
> can take a long period of time.  If this period is greater than the period
> of the current clocksource, the clocksource watchdog will mark the
> clocksource as unstable and fail the clocksource over.

A lot of our customers are running into this issue (especially the big
boxes).  This is patch solves their problem nicely.

The approach is a little heavier than the current approach, but it allows
a useful feature like sysrq-t to work reliably.

Acked-by: Don Zickus <dzickus@...hat.com>
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