linux-kernel - Re: [RFC] transcendent memory for Linux

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Date:	Tue, 30 Jun 2009 20:41:01 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	Linus Walleij <linus.ml.walleij@...il.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	npiggin@...e.de, chris.mason@...cle.com, kurt.hackel@...cle.com,
	dave.mccracken@...cle.com, Avi Kivity <avi@...hat.com>,
	jeremy@...p.org, Rik van Riel <riel@...hat.com>,
	alan@...rguk.ukuu.org.uk, Rusty Russell <rusty@...tcorp.com.au>,
	Martin Schwidefsky <schwidefsky@...ibm.com>, akpm@...l.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	tmem-devel@....oracle.com, sunil.mushran@...cle.com,
	linux-mm@...ck.org, Himanshu Raj <rhim@...rosoft.com>,
	linux-embedded@...r.kernel.org
Subject: Re: [RFC] transcendent memory for Linux


 > One issue though: I would guess that copying pages of memory
 > could be very slow in an inexpensive embedded processor.

And copying memory could very easily burn enough power by keeping the
CPU busy that you lose the incremental gain of turning the memory off
vs. just going to self refresh.  (And the copying latency would easily
be as bad as the transition latency to/from self-refresh).

 - R.
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