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

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Message-ID: <1332187387.18960.389.camel@twins>
Date:	Mon, 19 Mar 2012 21:03:07 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Avi Kivity <avi@...hat.com>
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 Mon, 2012-03-19 at 14:16 +0200, Avi Kivity wrote:
> > Afaik we do not use dma engines for memory migration. 
> 
> We don't, but I think we should. 

ISTR we (the community) had this discussion once. I also seem to
remember the general consensus being that DMA engines would mostly
likely not be worth the effort, although I can't really recall the
specifics.

Esp. for 4k pages the setup of the offload will likely be more expensive
than actually doing the memcpy.
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