From: Mel Gorman <mel@csn.ul.ie>
To: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>, Len Brown <lenb@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andi Kleen <andi@firstfloor.org>, Julia Lawall <julia@diku.dk>,
David Howells <dhowells@redhat.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Kay Sievers <kay.sievers@vrfy.org>, Ingo Molnar <mingo@elte.hu>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Daniel Kiper <dkiper@net-space.pl>,
Andrew Morton <akpm@linux-foundation.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Michal Hocko <mhocko@suse.cz>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Minchan Kim <minchan@kernel.org>,
Michal Nazarewicz <mina86@mina86.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Rik van Riel <riel@redhat.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Christoph Lameter <cl@linux.com>,
David Rientjes <rientjes@google.com>,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [RFC PATCH 2/3 V1] mm, page migrate: add MIGRATE_HOTREMOVE type
Date: Wed, 4 Jul 2012 11:19:55 +0100 [thread overview]
Message-ID: <20120704101942.GM13141@csn.ul.ie> (raw)
In-Reply-To: <1341386778-8002-3-git-send-email-laijs@cn.fujitsu.com>
On Wed, Jul 04, 2012 at 03:26:17PM +0800, Lai Jiangshan wrote:
> MIGRATE_HOTREMOVE is a special kind of MIGRATE_MOVABLE, but it is stable:
> any page of the type can NOT be changed to the other type nor be moved to
> the other free list.
>
> So the pages of MIGRATE_HOTREMOVE are always movable, this ability is
> useful for hugepages and hotremove ...etc.
>
> MIGRATE_HOTREMOVE pages is the used as the first candidate when
> we allocate movable pages.
>
> 1) add small routine is_migrate_movable() for movable-like types
> 2) add small routine is_migrate_stable() for stable types
> 3) fix some comments
> 4) fix get_any_page(). The get_any_page() may change
> MIGRATE_CMA/HOTREMOVE types page to MOVABLE which may cause this page
> to be changed to UNMOVABLE.
>
Reuse MIGRATE_CMA. Even if the pages are on the movable lists it should
not be a problem for memory hot-remove.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2012-07-04 10:20 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-04 7:26 [RFC PATCH 0/3 V1] mm: add new migrate type and online_movable for hotplug Lai Jiangshan
2012-07-04 7:26 ` [RFC PATCH 1/3 V1] mm, page_alloc: use __rmqueue_smallest when borrow memory from MIGRATE_CMA Lai Jiangshan
2012-07-04 10:17 ` Mel Gorman
2012-07-04 10:43 ` Lai Jiangshan
2012-07-04 11:19 ` Mel Gorman
2012-07-05 1:36 ` Lai Jiangshan
2012-07-05 8:38 ` Mel Gorman
2012-07-04 7:26 ` [RFC PATCH 2/3 V1] mm, page migrate: add MIGRATE_HOTREMOVE type Lai Jiangshan
2012-07-04 10:19 ` Mel Gorman [this message]
2012-07-04 10:50 ` Lai Jiangshan
2012-07-04 7:26 ` [RFC PATCH 3/3 V1] mm, memory-hotplug: add online_movable Lai Jiangshan
2012-07-04 14:58 ` Greg Kroah-Hartman
2012-07-04 7:35 ` [RFC PATCH 0/3 V1] mm: add new migrate type and online_movable for hotplug Minchan Kim
2012-07-04 8:23 ` Lai Jiangshan
2012-07-04 8:43 ` Lai Jiangshan
2012-07-05 9:05 ` Mel Gorman
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