linux-kernel - Re: [PATCH 0/2] RFC: readd fair sleepers for server systems

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Date:	Wed, 23 May 2012 17:43:54 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...nel.org>, Mike Galbraith <efault@....de>,
	linux-kernel@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH 0/2] RFC: readd fair sleepers for server systems

On Wed, 2012-05-23 at 17:28 +0200, Christian Ehrhardt wrote:
> We don't have any code for CONFIG_PARAVIRT and its childs yet, so I need 
> to look further into it. 

Yeah, screw CONFIG_PARAVIRT :-) Its just that the code that deals with
high res steal time is only used by them. So ideally you'd extract the
relevant bits from under CONFIG_PARAVIRT and use them.

So its that one block in update_rq_clock_task() (or both if you also
have high res irq accounting) and then you need to provide
paravirt_steal_clock(int cpu) which returns the steal time of that cpu
in nano-seconds granularity. Which I'm assuming s390 has available
someplace.

+- some renames to remove the paravirt_ part of names.

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