linux-kernel - Re: [PATCH 2/9] Sched clock paravirt op fix.patch

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Message-ID: <45F6D361.8080106@redhat.com>
Date:	Tue, 13 Mar 2007 12:37:53 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andi Kleen <ak@....de>
CC:	Chris Wright <chrisw@...s-sol.org>, Andrew Morton <akpm@...l.org>,
	Daniel Walker <dwalker@...sta.com>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [PATCH 2/9] Sched clock paravirt op fix.patch

Andi Kleen wrote:
> On Tue, Mar 13, 2007 at 09:07:09AM -0700, Chris Wright wrote:
>> * Jeremy Fitzhardinge (jeremy@...p.org) wrote:
>>> In other words, regardless of whether this particular pv_op lives or
>>> dies, we're going to need to have to deal with stolen time properly.  I
>>> think this hook is reasonable and useful step towards doing that.
>> Exactly.  Normal interrupts we can handle.  Having CPU completely
>> disappear for unkown time periods we can't, and will need to.
> 
> But that is just what a interrupt is.

Interrupts tend to be reasonably short though.

Steal time can be several hypervisor/host time slices long.

As an aside, normal interrupts *are* accounted for separately
in /proc/stat, so why not steal time too?

-- 
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