The patch titled
Subject: mm/hugetlb: add support for mempolicy MPOL_PREFERRED_MANY
has been added to the -mm tree. Its filename is
mm-hugetlb-add-support-for-mempolicy-mpol_preferred_many.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-add-support-for-mempolicy-mpol_preferred_many.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-add-support-for-mempolicy-mpol_preferred_many.patch
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------------------------------------------------------
From: Ben Widawsky <ben.widawsky@xxxxxxxxx>
Subject: mm/hugetlb: add support for mempolicy MPOL_PREFERRED_MANY
Implement the missing huge page allocation functionality while obeying the
preferred node semantics. This is similar to the implementation for
general page allocation, as it uses a fallback mechanism to try multiple
preferred nodes first, and then all other nodes.
[akpm: fix compling issue when merging with other hugetlb patch]
[Thanks to 0day bot for catching the missing #ifdef CONFIG_NUMA issue]
Link: https://lore.kernel.org/r/20200630212517.308045-12-ben.widawsky@xxxxxxxxx
Link: https://lkml.kernel.org/r/1627970362-61305-4-git-send-email-feng.tang@xxxxxxxxx
Suggested-by: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Ben Widawsky <ben.widawsky@xxxxxxxxx>
Co-developed-by: Feng Tang <feng.tang@xxxxxxxxx>
Signed-off-by: Feng Tang <feng.tang@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
--- a/mm/hugetlb.c~mm-hugetlb-add-support-for-mempolicy-mpol_preferred_many
+++ a/mm/hugetlb.c
@@ -1166,7 +1166,20 @@ static struct page *dequeue_huge_page_vm
gfp_mask = htlb_alloc_mask(h);
nid = huge_node(vma, address, gfp_mask, &mpol, &nodemask);
+#ifdef CONFIG_NUMA
+ if (mpol->mode == MPOL_PREFERRED_MANY) {
+ page = dequeue_huge_page_nodemask(h, gfp_mask, nid, nodemask);
+ if (page)
+ goto check_reserve;
+ /* Fallback to all nodes */
+ nodemask = NULL;
+ }
+#endif
page = dequeue_huge_page_nodemask(h, gfp_mask, nid, nodemask);
+
+#ifdef CONFIG_NUMA
+check_reserve:
+#endif
if (page && !avoid_reserve && vma_has_reserves(vma, chg)) {
SetHPageRestoreReserve(page);
h->resv_huge_pages--;
@@ -2147,6 +2160,21 @@ struct page *alloc_buddy_huge_page_with_
nodemask_t *nodemask;
nid = huge_node(vma, addr, gfp_mask, &mpol, &nodemask);
+#ifdef CONFIG_NUMA
+ if (mpol->mode == MPOL_PREFERRED_MANY) {
+ gfp_t gfp = gfp_mask | __GFP_NOWARN;
+
+ gfp &= ~(__GFP_DIRECT_RECLAIM | __GFP_NOFAIL);
+ page = alloc_surplus_huge_page(h, gfp, nid, nodemask, false);
+ if (page) {
+ mpol_cond_put(mpol);
+ return page;
+ }
+
+ /* Fallback to all nodes */
+ nodemask = NULL;
+ }
+#endif
page = alloc_surplus_huge_page(h, gfp_mask, nid, nodemask, false);
mpol_cond_put(mpol);
_
Patches currently in -mm which might be from ben.widawsky@xxxxxxxxx are
mm-hugetlb-add-support-for-mempolicy-mpol_preferred_many.patch
mm-mempolicy-advertise-new-mpol_preferred_many.patch
