From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>, Hugh Dickins <hughd@google.com>,
Andi Kleen <andi@firstfloor.org>, Hillf Danton <dhillf@gmail.com>,
Michal Hocko <mhocko@suse.cz>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 09/10] memory-hotplug: enable memory hotplug to handle hugepage
Date: Tue, 9 Apr 2013 17:27:44 -0400 [thread overview]
Message-ID: <CAHGf_=o+GQ9PJy=rkO1zxhd81NpyTvDQA7phN8StX2+EQ+ZE=g@mail.gmail.com> (raw)
In-Reply-To: <1365538036-pu7x5mck-mutt-n-horiguchi@ah.jp.nec.com>
>> numa_node_id() is really silly. This might lead to allocate from offlining node.
>
> Right, it should've been alloc_huge_page().
>
>> and, offline_pages() should mark hstate as isolated likes normal pages for prohibiting
>> new allocation at first.
>
> It seems that alloc_migrate_target() calls alloc_page() for normal pages
> and the destination pages can be in the same node with the source pages
> (new page allocation from the same memblock are prohibited.)
No. It can't. memory hotplug change buddy attribute to MIGRATE_ISOLTE at first.
then alloc_page() never allocate from source node. however huge page don't use
buddy. then we need another trick.
> So if we want to avoid new page allocation from the same node,
> this is the problem both for normal and huge pages.
>
> BTW, is it correct to think that all users of memory hotplug assume
> that they want to hotplug a whole node (not the part of it?)
Both are valid use case. admin can isolate a part of memory for isolating
broken memory range.
but I'm sure almost user want to remove whole node.
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next prev parent reply other threads:[~2013-04-09 21:28 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-22 20:23 [PATCH v2 0/10] extend hugepage migration Naoya Horiguchi
2013-03-22 20:23 ` [PATCH 01/10] migrate: add migrate_entry_wait_huge() Naoya Horiguchi
2013-03-23 15:55 ` Rik van Riel
2013-03-25 10:13 ` Michal Hocko
2013-03-26 4:25 ` Naoya Horiguchi
2013-04-05 20:33 ` KOSAKI Motohiro
2013-04-08 20:00 ` Naoya Horiguchi
2013-04-05 20:33 ` KOSAKI Motohiro
2013-03-22 20:23 ` [PATCH 02/10] migrate: make core migration code aware of hugepage Naoya Horiguchi
2013-03-25 10:57 ` Michal Hocko
2013-03-26 4:33 ` Naoya Horiguchi
2013-03-26 8:49 ` Michal Hocko
2013-04-05 20:41 ` KOSAKI Motohiro
2013-03-22 20:23 ` [PATCH 03/10] soft-offline: use migrate_pages() instead of migrate_huge_page() Naoya Horiguchi
2013-03-25 12:31 ` Michal Hocko
2013-03-26 4:34 ` Naoya Horiguchi
2013-03-26 9:49 ` Michal Hocko
2013-03-26 20:35 ` Naoya Horiguchi
2013-03-27 13:00 ` Michal Hocko
2013-04-05 21:11 ` KOSAKI Motohiro
2013-03-26 11:29 ` Aneesh Kumar K.V
2013-03-27 13:52 ` Michal Hocko
2013-03-27 19:19 ` Naoya Horiguchi
2013-03-28 8:53 ` Michal Hocko
2013-03-29 5:26 ` Aneesh Kumar K.V
2013-03-29 9:36 ` Michal Hocko
2013-04-01 5:13 ` Aneesh Kumar K.V
2013-04-02 9:45 ` Michal Hocko
2013-03-22 20:23 ` [PATCH 04/10] migrate: clean up migrate_huge_page() Naoya Horiguchi
2013-04-05 21:13 ` KOSAKI Motohiro
2013-03-22 20:23 ` [PATCH 05/10] migrate: add hugepage migration code to migrate_pages() Naoya Horiguchi
2013-03-25 13:04 ` Michal Hocko
2013-03-26 5:13 ` Naoya Horiguchi
2013-03-26 8:55 ` Michal Hocko
2013-04-05 21:17 ` KOSAKI Motohiro
2013-04-08 20:21 ` Naoya Horiguchi
2013-03-22 20:23 ` [PATCH 06/10] migrate: add hugepage migration code to move_pages() Naoya Horiguchi
2013-03-25 13:36 ` Michal Hocko
2013-03-26 7:06 ` Naoya Horiguchi
2013-03-26 10:02 ` Michal Hocko
2013-03-26 20:37 ` Naoya Horiguchi
2013-03-22 20:23 ` [PATCH 07/10] mbind: add hugepage migration code to mbind() Naoya Horiguchi
2013-03-25 13:49 ` Michal Hocko
2013-04-05 22:23 ` KOSAKI Motohiro
2013-04-06 7:04 ` Michal Hocko
2013-04-05 22:18 ` KOSAKI Motohiro
2013-04-08 20:25 ` Naoya Horiguchi
2013-03-22 20:23 ` [PATCH 08/10] migrate: remove VM_HUGETLB from vma flag check in vma_migratable() Naoya Horiguchi
2013-03-22 20:23 ` [PATCH 09/10] memory-hotplug: enable memory hotplug to handle hugepage Naoya Horiguchi
2013-03-25 15:09 ` Michal Hocko
2013-03-26 18:23 ` Naoya Horiguchi
2013-03-27 14:19 ` Michal Hocko
2013-03-27 21:29 ` Naoya Horiguchi
2013-03-27 21:58 ` Naoya Horiguchi
2013-03-27 22:55 ` Michal Hocko
2013-03-26 12:01 ` Aneesh Kumar K.V
2013-03-27 19:28 ` Naoya Horiguchi
2013-04-06 0:13 ` KOSAKI Motohiro
2013-04-09 20:07 ` Naoya Horiguchi
2013-04-09 21:27 ` KOSAKI Motohiro [this message]
2013-04-09 22:43 ` Naoya Horiguchi
2013-04-10 1:56 ` KOSAKI Motohiro
2013-04-10 2:24 ` Naoya Horiguchi
2013-03-22 20:23 ` [PATCH 10/10] prepare to remove /proc/sys/vm/hugepages_treat_as_movable Naoya Horiguchi
2013-03-25 15:12 ` Michal Hocko
2013-04-06 0:15 ` KOSAKI Motohiro
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