The patch titled
Subject: mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy
has been removed from the -mm tree. Its filename was
mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
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 alloc_pages_preferred_many() for it just like for
'interleave' policy, which will be used by 2 general memoory allocation
APIs: alloc_pages() and alloc_pages_vma()
Link: https://lore.kernel.org/r/20200630212517.308045-9-ben.widawsky@xxxxxxxxx
Link: https://lkml.kernel.org/r/1627970362-61305-3-git-send-email-feng.tang@xxxxxxxxx
Suggested-by: Michal Hocko <mhocko@xxxxxxxx>
Originally-by: Ben Widawsky <ben.widawsky@xxxxxxxxx>
Co-developed-by: Ben Widawsky <ben.widawsky@xxxxxxxxx>
Signed-off-by: Ben Widawsky <ben.widawsky@xxxxxxxxx>
Signed-off-by: Feng Tang <feng.tang@xxxxxxxxx>
Acked-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 | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
--- a/mm/mempolicy.c~mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy
+++ a/mm/mempolicy.c
@@ -2166,6 +2166,27 @@ static struct page *alloc_page_interleav
return page;
}
+static struct page *alloc_pages_preferred_many(gfp_t gfp, unsigned int order,
+ int nid, struct mempolicy *pol)
+{
+ struct page *page;
+ gfp_t preferred_gfp;
+
+ /*
+ * 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.
+ */
+ preferred_gfp = gfp | __GFP_NOWARN;
+ preferred_gfp &= ~(__GFP_DIRECT_RECLAIM | __GFP_NOFAIL);
+ page = __alloc_pages(preferred_gfp, order, nid, &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.
@@ -2201,6 +2222,12 @@ struct page *alloc_pages_vma(gfp_t gfp,
goto out;
}
+ if (pol->mode == MPOL_PREFERRED_MANY) {
+ page = alloc_pages_preferred_many(gfp, order, node, pol);
+ mpol_cond_put(pol);
+ goto out;
+ }
+
if (unlikely(IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && hugepage)) {
int hpage_node = node;
@@ -2278,6 +2305,9 @@ struct page *alloc_pages(gfp_t gfp, unsi
*/
if (pol->mode == MPOL_INTERLEAVE)
page = alloc_page_interleave(gfp, order, interleave_nodes(pol));
+ else if (pol->mode == MPOL_PREFERRED_MANY)
+ page = alloc_pages_preferred_many(gfp, order,
+ numa_node_id(), pol);
else
page = __alloc_pages(gfp, order,
policy_node(gfp, pol, numa_node_id()),
_
Patches currently in -mm which might be from feng.tang@xxxxxxxxx are
