linux-kernel - Re: [RFC PATCH 00/15] Nohz task support

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Message-ID: <1292895399.22905.68.camel@gandalf.stny.rr.com>
Date:	Mon, 20 Dec 2010 20:36:39 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 00/15] Nohz task support

On Tue, 2010-12-21 at 00:33 +0100, Frederic Weisbecker wrote:
>  
> > I wounder if we could just have this happen automatically.
> 
> But this would add some global overhead, especially in the syscall
> path as we need to take the slow path to hook userspace resume/exit.
>  

I guess we could measure the overhead. See if the timer causes more
overhead than the added overhead of the syscall, or not.

-- Steve


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