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Subject[PATCH v3 1/9] mm, hugetlb: move up the code which check availability of free huge page
Date
In this time we are holding a hugetlb_lock, so hstate values can't
be changed. If we don't have any usable free huge page in this time,
we don't need to proceede the processing. So move this code up.

Acked-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e2bfbf7..fc4988c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -539,10 +539,6 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
struct zoneref *z;
unsigned int cpuset_mems_cookie;

-retry_cpuset:
- cpuset_mems_cookie = get_mems_allowed();
- zonelist = huge_zonelist(vma, address,
- htlb_alloc_mask, &mpol, &nodemask);
/*
* A child process with MAP_PRIVATE mappings created by their parent
* have no page reserves. This check ensures that reservations are
@@ -556,6 +552,11 @@ retry_cpuset:
if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
goto err;

+retry_cpuset:
+ cpuset_mems_cookie = get_mems_allowed();
+ zonelist = huge_zonelist(vma, address,
+ htlb_alloc_mask, &mpol, &nodemask);
+
for_each_zone_zonelist_nodemask(zone, z, zonelist,
MAX_NR_ZONES - 1, nodemask) {
if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask)) {
@@ -574,7 +575,6 @@ retry_cpuset:
return page;

err:
- mpol_cond_put(mpol);
return NULL;
}

--
1.7.9.5


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