Hi,
while working on a hugetlb migration issue addressed in a separate
patchset [1] 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 [2] 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 4 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 third patch is a pure clean up
as well as the last patch.
Note that this patch depends on [1] (without the last patch which
is replaced by this work). You can find the whole series in
git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git branch
attempts/hugetlb-zonelists
I am sending this as an RFC because I might be missing some subtle
dependencies which led to the original design.
Shortlog
Michal Hocko (4):
mm, hugetlb: unclutter hugetlb allocation layers
hugetlb: add support for preferred node to alloc_huge_page_nodemask
mm, hugetlb: get rid of dequeue_huge_page_node
mm, hugetlb, soft_offline: use new_page_nodemask for soft offline migration
And the diffstat looks promissing as well
include/linux/hugetlb.h | 3 +-
include/linux/migrate.h | 2 +-
mm/hugetlb.c | 233 ++++++++++++++++--------------------------------
mm/memory-failure.c | 10 +--
4 files changed, 82 insertions(+), 166 deletions(-)
[1] http://lkml.kernel.org/r/20170608074553.22152-1-mhocko@xxxxxxxxxx
[2] http://lkml.kernel.org/r/20170608074553.22152-5-mhocko@xxxxxxxxxx
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