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authorXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>2012-03-21 16:33:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 17:54:56 -0700
commitcbde83e21c4fd50bfc4240408355c1e5d393063d (patch)
tree21899d4db2dadcdaea04b019c7d9f1d62344f5b4 /arch/x86/mm/hugetlbpage.c
parent4bfc130d5afa28395288d1b57092906349604b41 (diff)
hugetlb: try to search again if it is really needed
Search again only if some holes may be skipped in the first pass. [akpm@linux-foundation.org: clean up crazy compound definition] 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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/mm/hugetlbpage.c')
-rw-r--r--arch/x86/mm/hugetlbpage.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index 8ecbb4bba4b3..c20e81c3425d 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -309,9 +309,10 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
struct hstate *h = hstate_file(file);
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *prev_vma;
- unsigned long base = mm->mmap_base, addr = addr0;
+ unsigned long base = mm->mmap_base;
+ unsigned long addr = addr0;
unsigned long largest_hole = mm->cached_hole_size;
- int first_time = 1;
+ unsigned long start_addr;
/* don't allow allocations above current base */
if (mm->free_area_cache > base)
@@ -322,6 +323,8 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
mm->free_area_cache = base;
}
try_again:
+ start_addr = mm->free_area_cache;
+
/* make sure it can fit in the remaining address space */
if (mm->free_area_cache < len)
goto fail;
@@ -368,10 +371,9 @@ fail:
* if hint left us with no space for the requested
* mapping then try again:
*/
- if (first_time) {
+ if (start_addr != base) {
mm->free_area_cache = base;
largest_hole = 0;
- first_time = 0;
goto try_again;
}
/*