The patch titled
Subject: hugetlb: remove prev_vma from hugetlb_get_unmapped_area_topdown()
has been added to the -mm tree. Its filename is
hugetlb-drop-prev_vma-in-hugetlb_get_unmapped_area_topdown.patch
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------------------------------------------------------
From: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Subject: hugetlb: remove prev_vma from hugetlb_get_unmapped_area_topdown()
After looking up the vma which covers or follows the cached search
address, the following condition is always true:
!prev_vma || (addr >= prev_vma->vm_end)
so we can stop checking the previous VMA altogether.
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/mm/hugetlbpage.c | 18 +++++-------------
1 file changed, 5 insertions(+), 13 deletions(-)
diff -puN arch/x86/mm/hugetlbpage.c~hugetlb-drop-prev_vma-in-hugetlb_get_unmapped_area_topdown arch/x86/mm/hugetlbpage.c
--- a/arch/x86/mm/hugetlbpage.c~hugetlb-drop-prev_vma-in-hugetlb_get_unmapped_area_topdown
+++ a/arch/x86/mm/hugetlbpage.c
@@ -308,7 +308,7 @@ static unsigned long hugetlb_get_unmappe
{
struct hstate *h = hstate_file(file);
struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma, *prev_vma;
+ struct vm_area_struct *vma;
unsigned long base = mm->mmap_base;
unsigned long addr = addr0;
unsigned long largest_hole = mm->cached_hole_size;
@@ -340,22 +340,14 @@ try_again:
if (!vma)
return addr;
- /*
- * new region fits between prev_vma->vm_end and
- * vma->vm_start, use it:
- */
- prev_vma = vma->vm_prev;
- if (addr + len <= vma->vm_start &&
- (!prev_vma || (addr >= prev_vma->vm_end))) {
+ if (addr + len <= vma->vm_start) {
/* remember the address as a hint for next time */
mm->cached_hole_size = largest_hole;
return (mm->free_area_cache = addr);
- } else {
+ } else if (mm->free_area_cache == vma->vm_end) {
/* pull free_area_cache down to the first hole */
- if (mm->free_area_cache == vma->vm_end) {
- mm->free_area_cache = vma->vm_start;
- mm->cached_hole_size = largest_hole;
- }
+ mm->free_area_cache = vma->vm_start;
+ mm->cached_hole_size = largest_hole;
}
/* remember the largest hole we saw so far */
_
Subject: Subject: hugetlb: remove prev_vma from hugetlb_get_unmapped_area_topdown()
Patches currently in -mm which might be from xiaoguangrong@xxxxxxxxxxxxxxxxxx are
linux-next.patch
hugetlbfs-fix-hugetlb_get_unmapped_area.patch
hugetlb-try-to-search-again-if-it-is-really-needed.patch
hugetlb-try-to-search-again-if-it-is-really-needed-fix.patch
mm-do-not-reset-cached_hole_size-when-vma-is-unmapped.patch
mm-search-from-free_area_cache-for-the-bigger-size.patch
rmap-remove-__anon_vma_link.patch
hugetlb-drop-prev_vma-in-hugetlb_get_unmapped_area_topdown.patch
prio_tree-remove-unnecessary-code-in-prio_tree_replace.patch
prio_tree-cleanup-prio_tree_left-prio_tree_right.patch
prio_tree-simplify-prio_tree_expand.patch
prio_tree-introduce-prio_set_parent.patch
--
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