From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Christoph Lameter <clameter@sgi.com>
Cc: akpm@osdl.org, Peter Williams <pwil3058@bigpond.net.au>,
linux-kernel@vger.kernel.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Dave Chinner <dgc@sgi.com>, Ingo Molnar <mingo@elte.hu>,
"Siddha, Suresh B" <suresh.b.siddha@intel.com>
Subject: Re: [PATCH 5/5] Only call rebalance_domains when needed from scheduler_tick
Date: Fri, 27 Oct 2006 03:12:36 +1000 [thread overview]
Message-ID: <4540EC84.8070302@yahoo.com.au> (raw)
In-Reply-To: <Pine.LNX.4.64.0610260922400.16978@schroedinger.engr.sgi.com>
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.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2006-10-26 17:12 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-24 18:31 [PATCH 0/5] On demand sched_domain balancing in tasklet Christoph Lameter
2006-10-24 18:31 ` [PATCH 1/5] Disable interrupts for locking in load_balance() Christoph Lameter
2006-10-24 18:31 ` [PATCH 2/5] Extract load calculation from rebalance_tick Christoph Lameter
2006-10-26 12:03 ` Nick Piggin
2006-10-26 16:12 ` Christoph Lameter
2006-10-24 18:31 ` [PATCH 3/5] Use next_balance instead of last_balance Christoph Lameter
2006-10-26 12:13 ` Nick Piggin
2006-10-26 12:32 ` Nick Piggin
2006-10-26 16:44 ` Christoph Lameter
2006-10-26 17:13 ` Nick Piggin
2006-10-26 18:17 ` Christoph Lameter
2006-10-24 18:31 ` [PATCH 4/5] Create rebalance_domains from rebalance_tick Christoph Lameter
2006-10-26 12:19 ` Nick Piggin
2006-10-26 16:19 ` Christoph Lameter
2006-10-24 18:31 ` [PATCH 5/5] Only call rebalance_domains when needed from scheduler_tick Christoph Lameter
2006-10-26 12:26 ` Nick Piggin
2006-10-26 16:24 ` Christoph Lameter
2006-10-26 17:12 ` Nick Piggin [this message]
2006-10-26 18:13 ` Christoph Lameter
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