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

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Date:	Tue, 13 Mar 2007 21:56:28 +0100
From:	Andi Kleen <ak@....de>
To:	Rik van Riel <riel@...hat.com>
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

On Tue, Mar 13, 2007 at 12:37:53PM -0400, Rik van Riel wrote:
> 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.

It depends -- under heavy network load you can spend a long time
just processing interrupts.

-Andi

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