linux-kernel - Re: [PATCH 7/6][RFC] sched: unify load_balance{,

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Message-Id: <1261629824.10947.13.camel@marge.simson.net>
Date:	Thu, 24 Dec 2009 05:43:44 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	SureshSiddha <suresh.b.siddha@...el.com>,
	"Pallipadi,Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH 7/6][RFC] sched: unify load_balance{,_newidle}()

On Wed, 2009-12-23 at 16:13 +0100, Peter Zijlstra wrote:
> load_balance() and load_balance_newidle() look remarkably similar, one
> key point they differ in is the condition on when to active balance.
> 
> So split out that logic into a separate function.
> 
> One side effect is that previously load_balance_newidle() used to fail and
> return -1 under these conditions, whereas now it doesn't. I've not yet fully
> figured out the whole -1 return case for either load_balance{,_newidle}().
> 
> It also differs in that sd->cache_nice_tries is now added on the 
> CPU_NEWLY_IDLE case.

Unification Looks like a good idea, less being more and all that.  I
suspect that last bit is why newidle effectiveness has been heavily
impacted.  x264 ultrafast testcase is whimpering pathetically again ;-)

	-Mike

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