linux-kernel - Re: [accounting regression since rc1] scheduler updates

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Date:	Tue, 21 Aug 2007 09:20:54 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Jan Glauber <jang@...ux.vnet.ibm.com>,
	heiko.carstens@...ibm.com, Paul Mackerras <paulus@...ba.org>
Subject: Re: [accounting regression since rc1]  scheduler updates

Am Montag, 20. August 2007 schrieb Ingo Molnar:
> ok. Just to make it sure wrt. release-management: you said s390 
> sched_clock() is currently at least as precise as stime/utime - so this 
> would suggest that there is no regression over v2.6.22? Regardless of 

On current git s390 has a sched_clock implementaton based on real time. That 
means we have no knowledge about steal time. E.g. if you only get 50% of your 
physial cpu from the hypervisor on 2.6.22 a single cpu bound process has 50% 
in top while on 2.6.23-rc top shows 100%, so yes, there is a regression.

Christian



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