linux-kernel - [PATCH 0/3] mm, hugetlb: allow proper node fallback dequeue

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Date:   Thu, 22 Jun 2017 21:30:31 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     <linux-mm@...ck.org>, Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/3] mm, hugetlb: allow proper node fallback dequeue

Hi,
the previous version of this patchset has been sent as an RFC [1].
As it doesn't seem anybody would object I am resending and asking
for merging.

Original reasoning:

While working on a hugetlb migration issue addressed in a separate
patchset [2] I have noticed that the hugetlb allocations from the
preallocated pool are quite subotimal. There is no fallback mechanism
implemented and no notion of preferred node. I have tried to work
around it by [4] but Vlastimil was right to push back for a more robust
solution. It seems that such a solution is to reuse zonelist approach
we use for the page alloctor.

This series has 3 patches. The first one tries to make hugetlb
allocation layers more clear. The second one implements the zonelist
hugetlb pool allocation and introduces a preferred node semantic which
is used by the migration callbacks. The last patch is a clean up.

This is based on top of the current mmotm tree (mmotm-2017-06-16-13-59).

Shortlog
Michal Hocko (3):
      mm, hugetlb: unclutter hugetlb allocation layers
      hugetlb: add support for preferred node to alloc_huge_page_nodemask
      mm, hugetlb, soft_offline: use new_page_nodemask for soft offline migration

And the diffstat looks promissing as well

 include/linux/hugetlb.h |   5 +-
 include/linux/migrate.h |   2 +-
 mm/hugetlb.c            | 215 ++++++++++++++++--------------------------------
 mm/memory-failure.c     |  10 +--
 4 files changed, 75 insertions(+), 157 deletions(-)

[1] http://lkml.kernel.org/r/20170613090039.14393-1-mhocko@kernel.org
[2] http://lkml.kernel.org/r/20170608074553.22152-1-mhocko@kernel.org
[3] http://lkml.kernel.org/r/20170608074553.22152-5-mhocko@kernel.org