This is the basic implementation improved by later patches.
Later patches moves the new field to a dynamically allocated
page_autonuma taking 2 bytes per page (only allocated if booted on
NUMA hardware, unless "noautonuma" is passed as parameter to the
kernel at boot).
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
include/linux/mm_types.h | 11 +++++++++++
mm/page_alloc.c | 3 +++
2 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index c80101c..9e8398a 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -152,6 +152,17 @@ struct page {
struct page *first_page; /* Compound tail pages */
};
+#ifdef CONFIG_AUTONUMA
+ /*
+ * FIXME: move to pgdat section along with the memcg and allocate
+ * at runtime only in presence of a numa system.
+ */
+#if MAX_NUMNODES > 32767
+#error "too many nodes"
+#endif
+ short autonuma_last_nid;
+#endif
+
/*
* On machines where all RAM is mapped into kernel address space,
* we can simply calculate the virtual address. On machines with
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 77845f9..a9b18bc 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3793,6 +3793,9 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
set_pageblock_migratetype(page, MIGRATE_MOVABLE);
INIT_LIST_HEAD(&page->lru);
+#ifdef CONFIG_AUTONUMA
+ page->autonuma_last_nid = -1;
+#endif
#ifdef WANT_PAGE_VIRTUAL
/* The shift won't overflow because ZONE_NORMAL is below 4G. */
if (!is_highmem_idx(zone))
--
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