linux-kernel - Re: [RFC PATCH 0/8][Sorted-buddy] mm: Linux VM Infrastructure to support Memory Power Management

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Message-ID: <50A12062.4070205@linux.vnet.ibm.com>
Date:	Mon, 12 Nov 2012 21:44:26 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	SrinivasPandruvada <srinivas.pandruvada@...ux.intel.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, mjg59@...f.ucam.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	maxime.coquelin@...ricsson.com, loic.pallardy@...ricsson.com,
	Arjan van de Ven <arjan@...ux.intel.com>,
	kmpark@...radead.org, kamezawa.hiroyu@...fujitsu.com,
	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>
CC:	linux-pm@...r.kernel.org, Ankita Garg <gargankita@...il.com>,
	amit.kachhap@...aro.org,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	thomas.abraham@...aro.org,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	linux-mm@...ck.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	andi@...stfloor.org
Subject: Re: [RFC PATCH 0/8][Sorted-buddy] mm: Linux VM Infrastructure to
 support Memory Power Management

Hi Srinivas,

It looks like your email did not get delivered to the mailing
lists (and the people in the CC list) properly. So quoting your
entire mail as-it-is here. And thanks a lot for taking a look
at this patchset!

Regards,
Srivatsa S. Bhat

On 11/09/2012 10:18 PM, SrinivasPandruvada wrote:
> I did like this implementation and think it is valuable.
> I am experimenting with one of our HW. This type of partition does help in
> saving power. We believe we can save up-to 1W power per DIM with the help
> of some HW/BIOS changes. We are only talking about content preserving memory,
> so we don't have to be 100% correct.
> In my experiments, I tried two methods:
> - Similar to approach suggested by Mel Gorman. I have a special sticky
> migrate type like CMA.
> - Buddy buckets: Buddies are organized into memory region aware buckets.
> During allocation it prefers higher order buckets. I made sure that there is
> no affect of my change if there are no power saving memory DIMs. The advantage
> of this bucket is that I can keep the memory in close proximity for a related
> task groups by direct hashing to a bucket. The free list if organized as two
> dimensional array with bucket and migrate type for each order.
> 
> In both methods, currently reclaim is targetted to be done by a sysfs interface
> similar to memory compaction for a node allowing user space to initiate reclaim. 
> 
> Thanks,
> Srinivas Pandruvada
> Open Source Technology Center,
> Intel Corp.
> 

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