linux-kernel - Re: [patch] sched: add locking when update the task_group's cfs

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Message-ID: <49248A35.4080401@nortel.com>
Date:	Wed, 19 Nov 2008 15:50:45 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Ken Chen <kenchen@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Subject: Re: [patch] sched: add locking when update the task_group's	cfs_rq[]
  array.

Peter Zijlstra wrote:

> Will it scale, half-way, I'd say. It races a little, but should
> converge. The biggest issue is that we're running with 10 bit fixed
> point math, and on large cpu machines you get into granularity problems.

Is there any way to get higher resolution math on 64-bit machines?  (I'm 
assuming that most larger SMP boxes will be 64-bit capable.)

Chris
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