The patch titled
Subject: mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy
has been added to the -mm tree. Its filename is
mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch
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------------------------------------------------------
From: Feng Tang <feng.tang@xxxxxxxxx>
Subject: mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy
The semantics of MPOL_PREFERRED_MANY is similar to MPOL_PREFERRED, that it
will first try to allocate memory from the preferred node(s), and fallback
to all nodes in system when first try fails.
Add a dedicated function for it just like 'interleave' policy.
Link: https://lore.kernel.org/r/20200630212517.308045-9-ben.widawsky@xxxxxxxxx
Link: https://lkml.kernel.org/r/1626077374-81682-3-git-send-email-feng.tang@xxxxxxxxx
Signed-off-by: Feng Tang <feng.tang@xxxxxxxxx>
Signed-off-by: Ben Widawsky <ben.widawsky@xxxxxxxxx>
Co-developed-by: Ben Widawsky <ben.widawsky@xxxxxxxxx>
Suggested-by: Michal Hocko <mhocko@xxxxxxxx>
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/mempolicy.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
--- a/mm/mempolicy.c~mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy
+++ a/mm/mempolicy.c
@@ -2153,6 +2153,25 @@ static struct page *alloc_page_interleav
return page;
}
+static struct page *alloc_page_preferred_many(gfp_t gfp, unsigned int order,
+ struct mempolicy *pol)
+{
+ struct page *page;
+
+ /*
+ * This is a two pass approach. The first pass will only try the
+ * preferred nodes but skip the direct reclaim and allow the
+ * allocation to fail, while the second pass will try all the
+ * nodes in system.
+ */
+ page = __alloc_pages(((gfp | __GFP_NOWARN) & ~__GFP_DIRECT_RECLAIM),
+ order, first_node(pol->nodes), &pol->nodes);
+ if (!page)
+ page = __alloc_pages(gfp, order, numa_node_id(), NULL);
+
+ return page;
+}
+
/**
* alloc_pages_vma - Allocate a page for a VMA.
* @gfp: GFP flags.
_
Patches currently in -mm which might be from feng.tang@xxxxxxxxx are
mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch
mm-mempolicy-unify-the-create-func-for-bind-interleave-prefer-many-policies.patch
