The patch titled
Subject: hugetlbfs: fix hugetlb_get_unmapped_area()
has been added to the -mm tree. Its filename is
hugetlbfs-fix-hugetlb_get_unmapped_area.patch
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------------------------------------------------------
From: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Subject: hugetlbfs: fix hugetlb_get_unmapped_area()
Use/update cached_hole_size and free_area_cache properly to speedup
finding of a free region.
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>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/hugetlbfs/inode.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff -puN fs/hugetlbfs/inode.c~hugetlbfs-fix-hugetlb_get_unmapped_area fs/hugetlbfs/inode.c
--- a/fs/hugetlbfs/inode.c~hugetlbfs-fix-hugetlb_get_unmapped_area
+++ a/fs/hugetlbfs/inode.c
@@ -154,10 +154,12 @@ hugetlb_get_unmapped_area(struct file *f
return addr;
}
- start_addr = mm->free_area_cache;
-
- if (len <= mm->cached_hole_size)
+ if (len > mm->cached_hole_size)
+ start_addr = mm->free_area_cache;
+ else {
start_addr = TASK_UNMAPPED_BASE;
+ mm->cached_hole_size = 0;
+ }
full_search:
addr = ALIGN(start_addr, huge_page_size(h));
@@ -171,13 +173,18 @@ full_search:
*/
if (start_addr != TASK_UNMAPPED_BASE) {
start_addr = TASK_UNMAPPED_BASE;
+ mm->cached_hole_size = 0;
goto full_search;
}
return -ENOMEM;
}
- if (!vma || addr + len <= vma->vm_start)
+ if (!vma || addr + len <= vma->vm_start) {
+ mm->free_area_cache = addr + len;
return addr;
+ }
+ if (addr + mm->cached_hole_size < vma->vm_start)
+ mm->cached_hole_size = vma->vm_start - addr;
addr = ALIGN(vma->vm_end, huge_page_size(h));
}
}
_
Subject: Subject: hugetlbfs: fix hugetlb_get_unmapped_area()
Patches currently in -mm which might be from xiaoguangrong@xxxxxxxxxxxxxxxxxx are
hugetlbfs-fix-hugetlb_get_unmapped_area.patch
hugetlb-drop-prev_vma-in-hugetlb_get_unmapped_area_topdown.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
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