linux-kernel - Re: [RFC][PATCH 00/26] sched/numa

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Message-ID: <4F686E83.3030907@redhat.com>
Date:	Tue, 20 Mar 2012 13:48:19 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 00/26] sched/numa

On 03/20/2012 01:07 PM, Peter Zijlstra wrote:
> On Tue, 2012-03-20 at 12:52 +0200, Avi Kivity wrote:
>
> > You use the dma engine for eager copying, not on demand.
>
> Sure, but during that time no access to that entire vma is allowed, so
> you have to unmap it, and any fault in there will have to wait for the
> entire copy to complete.
>
> Or am I misunderstanding how things would work?

Option 1: write-protect the area you are migrating, on write fault allow
write access and discard the migration target (marking the page for
migration later)

Option 2: clear the dirty bits on the area you are migrating, after
migration completes examine the dirty bit, and if dirty, discard the
migration target.

-- 
error compiling committee.c: too many arguments to function

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