linux-kernel - Re: [RFC PATCH v2 00/15][Sorted-buddy] mm: Memory Power Management

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Date:	Tue, 28 May 2013 16:08:36 -0400
From:	Phillip Susi <psusi@...ntu.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
CC:	Simon Jeons <simon.jeons@...il.com>, akpm@...ux-foundation.org,
	mgorman@...e.de, matthew.garrett@...ula.com, dave@...1.net,
	rientjes@...gle.com, riel@...hat.com, arjan@...ux.intel.com,
	srinivas.pandruvada@...ux.intel.com,
	maxime.coquelin@...ricsson.com, loic.pallardy@...ricsson.com,
	kamezawa.hiroyu@...fujitsu.com, lenb@...nel.org, rjw@...k.pl,
	gargankita@...il.com, paulmck@...ux.vnet.ibm.com,
	amit.kachhap@...aro.org, svaidy@...ux.vnet.ibm.com,
	andi@...stfloor.org, wujianguo@...wei.com, kmpark@...radead.org,
	thomas.abraham@...aro.org, santosh.shilimkar@...com,
	linux-pm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 00/15][Sorted-buddy] mm: Memory Power Management

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On 4/19/2013 3:12 AM, Srivatsa S. Bhat wrote:
> But going further, as I had mentioned in my TODO list, we can be
> smarter than this while doing compaction to evacuate memory regions
> - we can choose to migrate only the active pages, and leave the
> inactive pages alone. Because, the goal is to actually consolidate
> the *references* and not necessarily the *allocations* themselves.

That would help with keeping references compact to allow use of the
low power states, but it would also be nice to keep allocations
compact, and completely power off a bank of ram with no allocations.


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