diff options
| author | Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> | 2012-03-21 16:33:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-21 17:54:56 -0700 |
| commit | f44d21985eb6af7361d3785e26923355172147bd (patch) | |
| tree | 1ced398274730cee6cd9173696e6fe08e52c6e91 /mm/mmap.c | |
| parent | cbde83e21c4fd50bfc4240408355c1e5d393063d (diff) | |
| download | lwn-f44d21985eb6af7361d3785e26923355172147bd.tar.gz lwn-f44d21985eb6af7361d3785e26923355172147bd.zip | |
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@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index da15a79b1441..4f31764d838f 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1426,10 +1426,8 @@ void arch_unmap_area(struct mm_struct *mm, unsigned long addr) /* * 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; - } } /* |