The patch titled
Subject: mm: do not reset cached_hole_size when vma is unmapped
has been removed from the -mm tree. Its filename was
mm-do-not-reset-cached_hole_size-when-vma-is-unmapped.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Subject: mm: do not reset cached_hole_size when vma is unmapped
In the current code, cached_hole_size is set to the maximum value if the
unmapped vma is less that free_area_cache so the next search will search
from the base address.
Actually, we can keep cached_hole_size so that if the next required size
is more than cached_hole_size, it can search from free_area_cache.
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Hillf Danton <dhillf@xxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff -puN mm/mmap.c~mm-do-not-reset-cached_hole_size-when-vma-is-unmapped mm/mmap.c
--- a/mm/mmap.c~mm-do-not-reset-cached_hole_size-when-vma-is-unmapped
+++ a/mm/mmap.c
@@ -1426,10 +1426,8 @@ void arch_unmap_area(struct mm_struct *m
/*
* Is this a new hole at the lowest possible address?
*/
- if (addr >= TASK_UNMAPPED_BASE && addr < mm->free_area_cache) {
+ if (addr >= TASK_UNMAPPED_BASE && addr < mm->free_area_cache)
mm->free_area_cache = addr;
- mm->cached_hole_size = ~0UL;
- }
}
/*
_
Patches currently in -mm which might be from xiaoguangrong@xxxxxxxxxxxxxxxxxx are
origin.patch
linux-next.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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