linux-kernel - Re: [PATCH 5/5] Only call rebalance_domains when needed from scheduler

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Date:	Fri, 27 Oct 2006 03:12:36 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Lameter <clameter@....com>
CC:	akpm@...l.org, Peter Williams <pwil3058@...pond.net.au>,
	linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Dave Chinner <dgc@....com>, Ingo Molnar <mingo@...e.hu>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: Re: [PATCH 5/5] Only call rebalance_domains when needed from scheduler_tick

Christoph Lameter wrote:
> On Thu, 26 Oct 2006, Nick Piggin wrote:
> 
> 
>>>Call rebalance_domains from a tasklet with interrupt enabled.
>>>Only call it when one of the sched domains is to be rebalanced.
>>>The jiffies when the next balancing action is to take place is
>>>kept in a per cpu variable next_balance.
>>
>>sched-domains was supposed to be able to build a whacky topology
>>so you didn't have to take the occasional big latency hit when
>>scanning 512 CPUs...
> 
> 
> How is that supposed to work? The load calculations will be off
> in that case and also the load balancing algorithm wont work anymore. 
> This is going to be a pretty significant rework of how the scheduler 
> works but given the problems with pinned tasks... maybe that is 
> necessary?
> duler?

What will the problem be? Sure it may pull tasks fom one group to
another when both could actually be pulling from a third, but it
the load balancing algorithm should work fine and not require any
rework.

-- 
SUSE Labs, Novell Inc.
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