linux-kernel - [PATCH 0/3] memory-hotplug: improve rezoning capability

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Date:	Mon,  9 May 2016 12:53:36 -0500
From:	Reza Arbab <arbab@...ux.vnet.ibm.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Tang Chen <tangchen@...fujitsu.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	David Vrabel <david.vrabel@...rix.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Banman <abanman@....com>, Chen Yucong <slaoub@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] memory-hotplug: improve rezoning capability

While it is currently possible to rezone memory when it is onlined, there are
implicit assumptions about the zones:

* To "online_kernel" a block into ZONE_NORMAL, it must currently
  be in ZONE_MOVABLE.

* To "online_movable" a block into ZONE_MOVABLE, it must currently
  be in (ZONE_MOVABLE - 1).

So on powerpc, where new memory is hotplugged into ZONE_DMA, these operations
do not work.

This patchset replaces the qualifications above with a more general
validation of zone movement.

Reza Arbab (3):
  memory-hotplug: add move_pfn_range()
  memory-hotplug: more general validation of zone during online
  memory-hotplug: use zone_can_shift() for sysfs valid_zones attribute

 drivers/base/memory.c          | 28 ++++++++++-------
 include/linux/memory_hotplug.h |  2 ++
 mm/memory_hotplug.c            | 70 ++++++++++++++++++++++++++++++++++--------
 3 files changed, 77 insertions(+), 23 deletions(-)

-- 
1.8.3.1