[PATCH 29/40] autonuma: retain page last_nid information in khugepaged
From: Andrea Arcangeli <hidden>
Date: 2012-06-28 13:04:57
Also in:
lkml
Subsystem:
memory management, memory management - thp (transparent huge page), the rest · Maintainers:
Andrew Morton, David Hildenbrand, Lorenzo Stoakes, Linus Torvalds
When pages are collapsed try to keep the last_nid information from one of the original pages. Signed-off-by: Andrea Arcangeli <redacted> --- mm/huge_memory.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 094f82b..ae20409 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c@@ -1814,7 +1814,18 @@ static bool __collapse_huge_page_copy(pte_t *pte, struct page *page, clear_user_highpage(page, address); add_mm_counter(vma->vm_mm, MM_ANONPAGES, 1); } else { +#ifdef CONFIG_AUTONUMA + int autonuma_last_nid; +#endif src_page = pte_page(pteval); +#ifdef CONFIG_AUTONUMA + /* pick the last one, better than nothing */ + autonuma_last_nid = + ACCESS_ONCE(src_page->autonuma_last_nid); + if (autonuma_last_nid >= 0) + ACCESS_ONCE(page->autonuma_last_nid) = + autonuma_last_nid; +#endif copy_user_highpage(page, src_page, address, vma); VM_BUG_ON(page_mapcount(src_page) != 1); VM_BUG_ON(page_count(src_page) != 2); --
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