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From: Ankita Garg <ankita@in.ibm.com>
To: david@lang.hm
Cc: Pekka Enberg <penberg@kernel.org>,
	linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	linux-pm@lists.linux-foundation.org, svaidy@linux.vnet.ibm.com,
	thomas.abraham@linaro.org, Dave Hansen <dave@linux.vnet.ibm.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	Arjan van de Ven <arjan@infradead.org>,
	Christoph Lameter <cl@linux.com>
Subject: Re: [PATCH 00/10] mm: Linux VM Infrastructure to support Memory Power Management
Date: Thu, 7 Jul 2011 10:24:20 +0530	[thread overview]
Message-ID: <20110707045420.GA23595@in.ibm.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1107061318190.2535@asgard.lang.hm>

On Wed, Jul 06, 2011 at 01:20:55PM -0700, david@lang.hm wrote:
> On Wed, 6 Jul 2011, Pekka Enberg wrote:
> 
> >Why does the allocator need to know about address boundaries? Why
> >isn't it enough to make the page allocator and reclaim policies favor using
> >memory from lower addresses as aggressively as possible? That'd mean
> >we'd favor the first memory banks and could keep the remaining ones
> >powered off as much as possible.
> >
> >IOW, why do we need to support scenarios such as this:
> >
> >  bank 0     bank 1   bank 2    bank3
> >| online  | offline | online  | offline |
> 
> I believe that there are memory allocations that cannot be moved
> after they are made (think about regions allocated to DMA from
> hardware where the hardware has already been given the address space
> to DMA into)
>

Thats true. These are kernel allocations which are not movable. However,
the ZONE_MOVABLE would enable us to create complete movable zones and
the ones that have the kernel allocations could be flagged as kernelcore
zone.
 
> As a result, you may not be able to take bank 2 offline, so your
> option is to either leave banks 0-2 all online, or support emptying
> bank 1 and taking it offline.
> 

-- 
Regards,
Ankita Garg (ankita@in.ibm.com)
Linux Technology Center
IBM India Systems & Technology Labs,
Bangalore, India

  reply	other threads:[~2011-07-07  4:54 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-27 12:31 [PATCH 00/10] mm: Linux VM Infrastructure to support Memory Power Management Ankita Garg
2011-05-27 12:31 ` [PATCH 01/10] mm: Introduce the memory regions data structure Ankita Garg
2011-05-27 15:30   ` Dave Hansen
2011-05-27 18:20     ` Vaidyanathan Srinivasan
2011-05-27 21:31       ` Dave Hansen
2011-05-29  8:16         ` Ankita Garg
2011-05-31 17:34           ` Dave Hansen
2011-06-02  8:54             ` Ankita Garg
2011-05-27 12:31 ` [PATCH 02/10] mm: Helper routines Ankita Garg
2011-05-27 12:31 ` [PATCH 03/10] mm: Init zones inside memory regions Ankita Garg
2011-05-27 12:31 ` [PATCH 04/10] mm: Refer to zones from " Ankita Garg
2011-05-27 12:31 ` [PATCH 05/10] mm: Create zonelists Ankita Garg
2011-05-27 12:31 ` [PATCH 06/10] mm: Verify zonelists Ankita Garg
2011-05-27 12:31 ` [PATCH 07/10] mm: Modify vmstat Ankita Garg
2011-05-27 12:31 ` [PATCH 08/10] mm: Modify vmscan Ankita Garg
2011-05-27 12:31 ` [PATCH 09/10] mm: Reflect memory region changes in zoneinfo Ankita Garg
2011-05-27 12:31 ` [PATCH 10/10] mm: Create memory regions at boot-up Ankita Garg
2011-05-28 14:39   ` Jean-Christophe PLAGNIOL-VILLARD
2011-05-28  7:56 ` [PATCH 00/10] mm: Linux VM Infrastructure to support Memory Power Management Andrew Morton
2011-05-28 13:16   ` Ankita Garg
2011-06-09 18:52   ` Paul E. McKenney
2011-06-10  0:51     ` Kyungmin Park
2011-06-10 15:11       ` Paul E. McKenney
2011-06-10 15:59         ` Matthew Garrett
2011-06-10 16:55           ` Paul E. McKenney
2011-06-10 17:05             ` Matthew Garrett
2011-06-10 17:19               ` Paul E. McKenney
2011-06-10 17:23                 ` Matthew Garrett
2011-06-10 17:52                   ` Paul E. McKenney
2011-06-10 18:08                     ` Matthew Garrett
2011-06-10 18:47                       ` Paul E. McKenney
2011-06-10 19:23                         ` Matthew Garrett
2011-06-10 19:37                           ` Paul E. McKenney
2011-06-10 20:12                             ` Matthew Garrett
2011-06-11  3:02                             ` Arjan van de Ven
2011-06-11 17:06                               ` Paul E. McKenney
2011-06-11 17:26                                 ` Arjan van de Ven
2011-06-12 23:07                                   ` Paul E. McKenney
2011-06-13 14:28                                     ` Arjan van de Ven
2011-06-13 23:04                                       ` Paul E. McKenney
2011-06-14  8:51                               ` Ankita Garg
2011-06-15 16:53                               ` Ankita Garg
2011-06-18  4:08                                 ` Arjan van de Ven
2011-06-10 17:33                 ` Ankita Garg
2011-06-11 17:08                   ` Paul E. McKenney
2011-07-12  5:31   ` amit kachhap
2011-06-13  4:47 ` KAMEZAWA Hiroyuki
2011-06-16  4:20   ` Ankita Garg
2011-06-16  9:12     ` KAMEZAWA Hiroyuki
2011-06-17 15:28       ` Ankita Garg
2011-06-19 23:53         ` KAMEZAWA Hiroyuki
2011-06-16 16:04     ` Dave Hansen
2011-06-17 10:03       ` Ankita Garg
2011-06-29 13:00 ` Ankita Garg
2011-06-29 17:06   ` Dave Hansen
2011-06-29 17:42     ` Ankita Garg
2011-06-29 17:59       ` Dave Hansen
2011-06-29 18:17         ` Vaidyanathan Srinivasan
2011-06-30  4:37           ` Ankita Garg
2011-06-29 20:11         ` Andi Kleen
2011-06-30  5:11           ` Ankita Garg
2011-06-29 18:07     ` Vaidyanathan Srinivasan
2011-07-06  8:45   ` Pekka Enberg
2011-07-06  9:01     ` Pekka Enberg
2011-07-06 16:50       ` Vaidyanathan Srinivasan
2011-07-06 16:41     ` Vaidyanathan Srinivasan
2011-07-06 20:20     ` david
2011-07-07  4:54       ` Ankita Garg [this message]
2011-07-07 18:00       ` Pekka Enberg
2011-07-08  1:32         ` david

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