linux-kernel - Re: [PATCH RFC tip/core/rcu 13/20] rcu: increase synchronize_sched

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Message-ID: <20101221075828.GJ2143@linux.vnet.ibm.com>
Date:	Mon, 20 Dec 2010 23:58:28 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com
Subject: Re: [PATCH RFC tip/core/rcu 13/20] rcu: increase
 synchronize_sched_expedited() batching

On Mon, Dec 20, 2010 at 11:31:20AM +0100, Peter Zijlstra wrote:
> On Sun, 2010-12-19 at 10:43 +0100, Tejun Heo wrote:
> > 
> > I see, then would something like the following work?
> > 
> >  (int)((unsigned)(a) - (unsigned)(b)) < 0 
> 
> Note that there is lots of kernel code that does the above and
> variations thereof and expects it to work.

Given that the approach I have been using is the same number of lines
and avoids relying on this expectation, I will stick with it.

							Thanx, Paul
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