The patch titled
Subject: thp: setup huge zero page on non-write page fault
has been removed from the -mm tree. Its filename was
thp-setup-huge-zero-page-on-non-write-page-fault.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: thp: setup huge zero page on non-write page fault
All code paths seems covered. Now we can map huge zero page on read page
fault.
We setup it in do_huge_pmd_anonymous_page() if area around fault address
is suitable for THP and we've got read page fault.
If we fail to setup huge zero page (ENOMEM) we fallback to
handle_pte_fault() as we normally do in THP.
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 | 10 ++++++++++
1 file changed, 10 insertions(+)
diff -puN mm/huge_memory.c~thp-setup-huge-zero-page-on-non-write-page-fault mm/huge_memory.c
--- a/mm/huge_memory.c~thp-setup-huge-zero-page-on-non-write-page-fault
+++ a/mm/huge_memory.c
@@ -733,6 +733,16 @@ int do_huge_pmd_anonymous_page(struct mm
return VM_FAULT_OOM;
if (unlikely(khugepaged_enter(vma)))
return VM_FAULT_OOM;
+ if (!(flags & FAULT_FLAG_WRITE)) {
+ pgtable_t pgtable;
+ pgtable = pte_alloc_one(mm, haddr);
+ if (unlikely(!pgtable))
+ return VM_FAULT_OOM;
+ spin_lock(&mm->page_table_lock);
+ set_huge_zero_page(pgtable, mm, vma, haddr, pmd);
+ spin_unlock(&mm->page_table_lock);
+ return 0;
+ }
page = alloc_hugepage_vma(transparent_hugepage_defrag(vma),
vma, haddr, numa_node_id(), 0);
if (unlikely(!page)) {
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
x86-convert-update_mmu_cache-and-update_mmu_cache_pmd-to-functions.patch
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