mm, hugetlb: remove decrement_hugepage_resv_vma()

Now, Checking condition of decrement_hugepage_resv_vma() and
vma_has_reserves() is same, so we can clean-up this function with
vma_has_reserves().  Additionally, decrement_hugepage_resv_vma() has only
one call site, so we can remove function and embed it into
dequeue_huge_page_vma() directly.  This patch implement it.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Hillf Danton <dhillf@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index cb134e6..dacf0d2 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -434,25 +434,6 @@ static int is_vma_resv_set(struct vm_area_struct *vma, unsigned long flag)
        return (get_vma_private_data(vma) & flag) != 0;
 }
 
-/* Decrement the reserved pages in the hugepage pool by one */
-static void decrement_hugepage_resv_vma(struct hstate *h,
-                       struct vm_area_struct *vma)
-{
-       if (vma->vm_flags & VM_NORESERVE)
-               return;
-
-       if (vma->vm_flags & VM_MAYSHARE) {
-               /* Shared mappings always use reserves */
-               h->resv_huge_pages--;
-       } else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
-               /*
-                * Only the process that called mmap() has reserves for
-                * private mappings.
-                */
-               h->resv_huge_pages--;
-       }
-}
-
 /* Reset counters to 0 and clear all HPAGE_RESV_* flags */
 void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 {
@@ -466,10 +447,18 @@ static int vma_has_reserves(struct vm_area_struct *vma)
 {
        if (vma->vm_flags & VM_NORESERVE)
                return 0;
+
+       /* Shared mappings always use reserves */
        if (vma->vm_flags & VM_MAYSHARE)
                return 1;
+
+       /*
+        * Only the process that called mmap() has reserves for
+        * private mappings.
+        */
        if (is_vma_resv_set(vma, HPAGE_RESV_OWNER))
                return 1;
+
        return 0;
 }
 
@@ -564,8 +553,8 @@ retry_cpuset:
                if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask)) {
                        page = dequeue_huge_page_node(h, zone_to_nid(zone));
                        if (page) {
-                               if (!avoid_reserve)
-                                       decrement_hugepage_resv_vma(h, vma);
+                               if (!avoid_reserve && vma_has_reserves(vma))
+                                       h->resv_huge_pages--;
                                break;
                        }
                }