Re: [PATCH 1/3] sched, balancing: Update rq->max_idle_balance_cost whenever newidle balance is attempted

[Jason Low <jason.low2@hp.com>]

On Sat, 2014-04-26 at 16:50 +0200, Peter Zijlstra wrote:
> On Fri, Apr 25, 2014 at 12:54:14PM -0700, Jason Low wrote:
> > Preeti mentioned that sd->balance_interval is changed during load_balance().
> > Should we also consider updating the interval in rebalance_domains() after
> > calling load_balance(),
> 
> Yeah, that might make sense.
> 
> > and also taking max_load_balance_interval into account
> > in the updates for next_balance in idle_balance()?
> 
> I was thinking that max_load_balance_interval thing was mostly about the
> *busy_factor thing, but sure, can't hurt to be consistent and always do
> it.
> 
> > If so, how about the something like the below change which also introduces
> > get_sd_balance_interval() to obtain the sd's balance interval, and have both
> > update_next_balance() and rebalance_domains() use that function.
> 
> Yes, that looks good.
> 
> Can you send it with a proper changelog?

Sure, I'll send a v2 patchset so that this applies with the other
patches. I also think it would be beneficial to split this change into 2
patches (the 1st patch fixes commit e5fc6611, and the 2nd patch changes
how next_balance gets updated).