1 files changed, 79 insertions, 10 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 6d7296dd11b8..ef37c85423a5 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1405,12 +1405,25 @@ pgoff_t __basepage_index(struct page *page)
 }
 
 static struct page *alloc_buddy_huge_page(struct hstate *h,
-		gfp_t gfp_mask, int nid, nodemask_t *nmask)
+		gfp_t gfp_mask, int nid, nodemask_t *nmask,
+		nodemask_t *node_alloc_noretry)
 {
 	int order = huge_page_order(h);
 	struct page *page;
+	bool alloc_try_hard = true;
 
-	gfp_mask |= __GFP_COMP|__GFP_RETRY_MAYFAIL|__GFP_NOWARN;
+	/*
+	 * By default we always try hard to allocate the page with
+	 * __GFP_RETRY_MAYFAIL flag.  However, if we are allocating pages in
+	 * a loop (to adjust global huge page counts) and previous allocation
+	 * failed, do not continue to try hard on the same node.  Use the
+	 * node_alloc_noretry bitmap to manage this state information.
+	 */
+	if (node_alloc_noretry && node_isset(nid, *node_alloc_noretry))
+		alloc_try_hard = false;
+	gfp_mask |= __GFP_COMP|__GFP_NOWARN;
+	if (alloc_try_hard)
+		gfp_mask |= __GFP_RETRY_MAYFAIL;
 	if (nid == NUMA_NO_NODE)
 		nid = numa_mem_id();
 	page = __alloc_pages_nodemask(gfp_mask, order, nid, nmask);
@@ -1419,6 +1432,22 @@ static struct page *alloc_buddy_huge_page(struct hstate *h,
 	else
 		__count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
 
+	/*
+	 * If we did not specify __GFP_RETRY_MAYFAIL, but still got a page this
+	 * indicates an overall state change.  Clear bit so that we resume
+	 * normal 'try hard' allocations.
+	 */
+	if (node_alloc_noretry && page && !alloc_try_hard)
+		node_clear(nid, *node_alloc_noretry);
+
+	/*
+	 * If we tried hard to get a page but failed, set bit so that
+	 * subsequent attempts will not try as hard until there is an
+	 * overall state change.
+	 */
+	if (node_alloc_noretry && !page && alloc_try_hard)
+		node_set(nid, *node_alloc_noretry);
+
 	return page;
 }
 
@@ -1427,7 +1456,8 @@ static struct page *alloc_buddy_huge_page(struct hstate *h,
  * should use this function to get new hugetlb pages
  */
 static struct page *alloc_fresh_huge_page(struct hstate *h,
-		gfp_t gfp_mask, int nid, nodemask_t *nmask)
+		gfp_t gfp_mask, int nid, nodemask_t *nmask,
+		nodemask_t *node_alloc_noretry)
 {
 	struct page *page;
 
@@ -1435,7 +1465,7 @@ static struct page *alloc_fresh_huge_page(struct hstate *h,
 		page = alloc_gigantic_page(h, gfp_mask, nid, nmask);
 	else
 		page = alloc_buddy_huge_page(h, gfp_mask,
-				nid, nmask);
+				nid, nmask, node_alloc_noretry);
 	if (!page)
 		return NULL;
 
@@ -1450,14 +1480,16 @@ static struct page *alloc_fresh_huge_page(struct hstate *h,
  * Allocates a fresh page to the hugetlb allocator pool in the node interleaved
  * manner.
  */
-static int alloc_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed)
+static int alloc_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed,
+				nodemask_t *node_alloc_noretry)
 {
 	struct page *page;
 	int nr_nodes, node;
 	gfp_t gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
 
 	for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) {
-		page = alloc_fresh_huge_page(h, gfp_mask, node, nodes_allowed);
+		page = alloc_fresh_huge_page(h, gfp_mask, node, nodes_allowed,
+						node_alloc_noretry);
 		if (page)
 			break;
 	}
@@ -1601,7 +1633,7 @@ static struct page *alloc_surplus_huge_page(struct hstate *h, gfp_t gfp_mask,
 		goto out_unlock;
 	spin_unlock(&hugetlb_lock);
 
-	page = alloc_fresh_huge_page(h, gfp_mask, nid, nmask);
+	page = alloc_fresh_huge_page(h, gfp_mask, nid, nmask, NULL);
 	if (!page)
 		return NULL;
 
@@ -1637,7 +1669,7 @@ struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
 	if (hstate_is_gigantic(h))
 		return NULL;
 
-	page = alloc_fresh_huge_page(h, gfp_mask, nid, nmask);
+	page = alloc_fresh_huge_page(h, gfp_mask, nid, nmask, NULL);
 	if (!page)
 		return NULL;
 
@@ -2207,13 +2239,33 @@ static void __init gather_bootmem_prealloc(void)
 static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
 {
 	unsigned long i;
+	nodemask_t *node_alloc_noretry;
+
+	if (!hstate_is_gigantic(h)) {
+		/*
+		 * Bit mask controlling how hard we retry per-node allocations.
+		 * Ignore errors as lower level routines can deal with
+		 * node_alloc_noretry == NULL.  If this kmalloc fails at boot
+		 * time, we are likely in bigger trouble.
+		 */
+		node_alloc_noretry = kmalloc(sizeof(*node_alloc_noretry),
+						GFP_KERNEL);
+	} else {
+		/* allocations done at boot time */
+		node_alloc_noretry = NULL;
+	}
+
+	/* bit mask controlling how hard we retry per-node allocations */
+	if (node_alloc_noretry)
+		nodes_clear(*node_alloc_noretry);
 
 	for (i = 0; i < h->max_huge_pages; ++i) {
 		if (hstate_is_gigantic(h)) {
 			if (!alloc_bootmem_huge_page(h))
 				break;
 		} else if (!alloc_pool_huge_page(h,
-					 &node_states[N_MEMORY]))
+					 &node_states[N_MEMORY],
+					 node_alloc_noretry))
 			break;
 		cond_resched();
 	}
@@ -2225,6 +2277,8 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
 			h->max_huge_pages, buf, i);
 		h->max_huge_pages = i;
 	}
+
+	kfree(node_alloc_noretry);
 }
 
 static void __init hugetlb_init_hstates(void)
@@ -2323,6 +2377,17 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid,
 			      nodemask_t *nodes_allowed)
 {
 	unsigned long min_count, ret;
+	NODEMASK_ALLOC(nodemask_t, node_alloc_noretry, GFP_KERNEL);
+
+	/*
+	 * Bit mask controlling how hard we retry per-node allocations.
+	 * If we can not allocate the bit mask, do not attempt to allocate
+	 * the requested huge pages.
+	 */
+	if (node_alloc_noretry)
+		nodes_clear(*node_alloc_noretry);
+	else
+		return -ENOMEM;
 
 	spin_lock(&hugetlb_lock);
 
@@ -2356,6 +2421,7 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid,
 	if (hstate_is_gigantic(h) && !IS_ENABLED(CONFIG_CONTIG_ALLOC)) {
 		if (count > persistent_huge_pages(h)) {
 			spin_unlock(&hugetlb_lock);
+			NODEMASK_FREE(node_alloc_noretry);
 			return -EINVAL;
 		}
 		/* Fall through to decrease pool */
@@ -2388,7 +2454,8 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid,
 		/* yield cpu to avoid soft lockup */
 		cond_resched();
 
-		ret = alloc_pool_huge_page(h, nodes_allowed);
+		ret = alloc_pool_huge_page(h, nodes_allowed,
+						node_alloc_noretry);
 		spin_lock(&hugetlb_lock);
 		if (!ret)
 			goto out;
@@ -2429,6 +2496,8 @@ out:
 	h->max_huge_pages = persistent_huge_pages(h);
 	spin_unlock(&hugetlb_lock);
 
+	NODEMASK_FREE(node_alloc_noretry);
+
 	return 0;
 }