linux-kernel - Re: v2.6.21.4-rt11

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Message-ID: <20070618173558.GA17865@linux.vnet.ibm.com>
Date:	Mon, 18 Jun 2007 23:05:58 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Christoph Lameter <clameter@....com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dinakar Guniguntala <dino@...ibm.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	suresh.b.siddha@...el.com, pwil3058@...pond.net.au,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: v2.6.21.4-rt11

On Mon, Jun 18, 2007 at 09:54:18AM -0700, Christoph Lameter wrote:
> The nodes-level domain looks for internode balances between up to 16 
> nodes. It is not restricted to a single node.

I was mostly speaking with the example system in mind (4-node 4-cpu
box), but yes, node-level domain does look for imbalance across max 16
nodes as you mention.

Both node and all-node domains don't have SD_BALANCE_NEWIDLE set, which
means idle_balance() will stop looking for imbalance beyonds its own
node. Based on the observed balance within its own node, IMO,
idle_balance() should not cause ->next_balance to be reset.

-- 
Regards,
vatsa
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