[RFC PATCH 0/2] mm, memory_hotplug: remove zone onlining restriction

From: Michal Hocko <mhocko@kernel.org>
To: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Reza Arbab <arbab@linux.vnet.ibm.com>,
	Yasuaki Ishimatsu <yasu.isimatu@gmail.com>,
	qiuxishi@huawei.com, Kani Toshimitsu <toshi.kani@hpe.com>,
	slaoub@gmail.com, Joonsoo Kim <js1304@gmail.com>,
	Daniel Kiper <daniel.kiper@oracle.com>,
	Igor Mammedov <imammedo@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wei Yang <richard.weiyang@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: [RFC PATCH 0/2] mm, memory_hotplug: remove zone onlining restriction
Date: Thu, 29 Jun 2017 09:35:07 +0200	[thread overview]
Message-ID: <20170629073509.623-1-mhocko@kernel.org> (raw)

Hi,
I am sending this as an RFC because this hasn't seen a lot of testing
yet but I would like to see whether the semantic I came up with (see
patch 2) is sensible. This work should help Joonsoo with his CMA zone
based approach when reusing MOVABLE zone. I think it will also help to
remove more code from the memory hotplug (e.g. zone shrinking).

Patch 1 restores original memoryXY/valid_zones semantic wrt zone
ordering. This can be merged without patch 2 which removes the zone
overlap restriction and defines a semantic for the default onlining. See
more in the patch.

Questions, concerns, objections?

Shortlog
Michal Hocko (2):
      mm, memory_hotplug: display allowed zones in the preferred ordering
      mm, memory_hotplug: remove zone restrictions

Diffstat
 drivers/base/memory.c          | 30 ++++++++++-----
 include/linux/memory_hotplug.h |  2 +-
 mm/memory_hotplug.c            | 87 +++++++++++++++++-------------------------
 3 files changed, 55 insertions(+), 64 deletions(-)