linux-kernel - Re: [RFC PATCH v3 3/5] sched: nominate preferred wakeup cpu

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Date:	Tue, 11 Nov 2008 20:51:26 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Gregory Haskins <gregory.haskins@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Collier-Brown <davecb@....com>,
	Tim Connors <tconnors@...ro.swin.edu.au>,
	Max Krasnyansky <maxk@...lcomm.com>
Subject: Re: [RFC PATCH v3 3/5] sched: nominate preferred wakeup cpu

On Tue, Nov 11, 2008 at 09:07:58AM -0500, Gregory Haskins wrote:
> > Would it make sense to place the preferred_wakeup_cpu stuff in the
> > root_domain structure we already have?
> >   
> 
> From the description, this is exactly what the root-domains were created
> to solve.
> 
> Vaidyanathan,  just declare your object in "struct root_domain" and
> initialize it in init_rootdomain() in kernel/sched.c, and then access it
> via rq->rd to take advantage of this infrastructure.  It will
> automatically follow any partitioning that happens to be configured.

If I understand correctly, we may want to have more than one preferred
cpu in a given sched domain, taking into account node topology i.e if a
given sched domain encompasses two nodes, then we may like to designate
2 preferred wakeup_cpu's, one per node. If that is the case, then
root_domain may not be of use here?

- vatsa
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