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Date: Tue, 21 Dec 2010 03:15:26 +0100
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: LKML <linux-kernel@vger.kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
        Lai Jiangshan <laijs@cn.fujitsu.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Anton Blanchard <anton@au1.ibm.com>,
        Tim Pepper <lnxninja@linux.vnet.ibm.com>
Subject: Re: [RFC PATCH 00/15] Nohz task support
Message-ID: <20101221021523.GA2605@nowhere>
References: <1292858662-5650-1-git-send-email-fweisbec@gmail.com>
 <1292859886.22905.22.camel@gandalf.stny.rr.com>
 <20101220233341.GA1715@nowhere>
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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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