hugetlb: add support for preferred node to alloc_huge_page_nodemask
alloc_huge_page_nodemask tries to allocate from any numa node in the
allowed node mask. This might lead to filling up low NUMA nodes while
others are not used. We can reduce this risk by introducing a concept
of the preferred node similar to what we have in the regular page
allocator. We will start allocating from the preferred nid and then
iterate over all allowed nodes until we try them all. Introduce
for_each_node_mask_preferred helper which does the iteration and reuse
the available preferred node in new_page_nodemask which is currently
the only caller of alloc_huge_page_nodemask.
Signed-off-by: Michal Hocko <mhocko@suse.com>
4 files changed
