linux-kernel - Re: v2.6.21.4-rt11

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Message-ID: <20070619021342.GC7160@linux-os.sc.intel.com>
Date:	Mon, 18 Jun 2007 19:13:43 -0700
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	Christoph Lameter <clameter@....com>,
	"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 Tue, Jun 19, 2007 at 07:22:32AM +0530, Srivatsa Vaddagiri wrote:
> On Mon, Jun 18, 2007 at 10:59:21AM -0700, Christoph Lameter wrote:
> > I think the check in idle_balance needs to be modified.
> > 
> > If the domain *does not* have SD_BALANCE_NEWIDLE set then
> > next_balance must still be set right. Does this patch fix it?
> 
> Is the ->next_balance calculation in idle_balance() necessary at all?
> rebalance_domains() would have programmed ->next_balance anyway, based
> on the nearest next_balance point of all (load-balance'able) domains.
> By repeating that calculation in idle_balance, are we covering any corner case?

rebalance_domains() have programmed ->next_balance based on 'busy' state.
And now, as it is going to 'idle', this routine is recalculating
the next_balance based on 'idle' state.

thanks,
suresh
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