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

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Date:	Thu, 26 Oct 2006 22:26:46 +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:
> Only call rebalance_domains when needed from scheduler_tick.
> 
> 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...

Ideas were: overlapping, non-covering top level domains, or a
SD_BALANCE_ROTOR, which scans only N (< all) groups on each
balance attempt, but more frequently.

-- 
SUSE Labs, Novell Inc.
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