linux-kernel - Re: [PATCH] virtual sched

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Message-ID: <20070719193840.GA29523@elte.hu>
Date:	Thu, 19 Jul 2007 21:38:40 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jan Glauber <jang@...ux.vnet.ibm.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	LKML <linux-kernel@...r.kernel.org>, vatsa@...ux.vnet.ibm.com,
	mschwid2@...ux.vnet.ibm.com, efault@....de,
	dmitry.adamushko@...il.com, paulus@...ba.org, anton@...ba.org
Subject: Re: [PATCH] virtual sched_clock() for s390


* Jan Glauber <jang@...ux.vnet.ibm.com> wrote:

> > still, CFS needs time measurement across idle periods as well, for 
> > another purpose: to be able to do precise task statistics for /proc. 
> > (for top, ps, etc.) So it's still true that sched_clock() should 
> > include idle periods too.
> 
> I'm not sure, s390 already has an implemetation for precise accounting 
> in the architecture code, does CFS also improve accounting data?

what kind of precise accounting does s390 have in the architecture code? 
CFS changes task (and load) accounting to be sched_clock() driven in 
essence.

	Ingo
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