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

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Message-ID: <20101221021523.GA2605@nowhere>
Date:	Tue, 21 Dec 2010 03:15:26 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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 Mon, Dec 20, 2010 at 08:36:39PM -0500, Steven Rostedt wrote:
> 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.

Indeed, but may be let's stage that first as a conditional attribute
and if it proves better results most of the time, then let's make it
the default.

Hm?
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