linux-kernel - Re: [patch 2/2] RFC sched: Scale the nohz_tracker logic by making it per NUMA node

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Date:	Thu, 18 Jun 2009 00:51:16 +0530
From:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	venkatesh.pallipadi@...el.com
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Gautham R Shenoy <ego@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [patch 2/2] RFC sched: Scale the nohz_tracker logic by making
	it per NUMA node

* venkatesh.pallipadi@...el.com <venkatesh.pallipadi@...el.com> [2009-06-17 11:26:51]:

> Having one idle CPU doing the rebalancing for all the idle CPUs in
> nohz mode does not scale well with increasing number of cores and
> sockets. Make the nohz_tracker per NUMA node. This results in multiple
> idle load balancing happening at NUMA node level and idle load balancer
> only does the rebalance domain among all the other nohz CPUs in that
> NUMA node.

This is a good optimisations but maybe an overkill for single chip
NUMA node machines like a two socket Nehalems or Optrons.

Some method to create load balancer group based on the scale of the
machine will be good.

--Vaidy
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