The patch titled
Subject: thp-copy_huge_pmd-copy-huge-zero-page-v6
has been added to the -mm tree. Its filename is
thp-copy_huge_pmd-copy-huge-zero-page-v6.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: thp-copy_huge_pmd-copy-huge-zero-page-v6
It's easy to copy huge zero page. Just set destination pmd to huge zero
page.
It's safe to copy huge zero page since we have none yet :-p
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 5 +++++
1 file changed, 5 insertions(+)
diff -puN mm/huge_memory.c~thp-copy_huge_pmd-copy-huge-zero-page-v6 mm/huge_memory.c
--- a/mm/huge_memory.c~thp-copy_huge_pmd-copy-huge-zero-page-v6
+++ a/mm/huge_memory.c
@@ -947,6 +947,11 @@ int copy_huge_pmd(struct mm_struct *dst_
pte_free(dst_mm, pgtable);
goto out_unlock;
}
+ /*
+ * mm->pagetable lock is enough to be sure that huge zero pmd is not
+ * under splitting since we don't split the page itself, only pmd to
+ * a page table.
+ */
if (is_huge_zero_pmd(pmd)) {
set_huge_zero_page(pgtable, dst_mm, vma, addr, dst_pmd);
ret = 0;
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
linux-next.patch
mm-use-is_enabledconfig_numa-instead-of-numa_build.patch
mm-use-is_enabledconfig_compaction-instead-of-compaction_build.patch
thp-huge-zero-page-basic-preparation.patch
thp-huge-zero-page-basic-preparation-v6.patch
thp-zap_huge_pmd-zap-huge-zero-pmd.patch
thp-copy_huge_pmd-copy-huge-zero-page.patch
thp-copy_huge_pmd-copy-huge-zero-page-v6.patch
thp-do_huge_pmd_wp_page-handle-huge-zero-page.patch
thp-do_huge_pmd_wp_page-handle-huge-zero-page-v6.patch
thp-change_huge_pmd-keep-huge-zero-page-write-protected.patch
thp-change-split_huge_page_pmd-interface.patch
thp-change-split_huge_page_pmd-interface-v6.patch
thp-implement-splitting-pmd-for-huge-zero-page.patch
thp-implement-splitting-pmd-for-huge-zero-page-v6.patch
thp-setup-huge-zero-page-on-non-write-page-fault.patch
thp-lazy-huge-zero-page-allocation.patch
thp-implement-refcounting-for-huge-zero-page.patch
thp-vmstat-implement-hzp_alloc-and-hzp_alloc_failed-events.patch
thp-vmstat-implement-hzp_alloc-and-hzp_alloc_failed-events-v6.patch
thp-introduce-sysfs-knob-to-disable-huge-zero-page.patch
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