linux-kernel - [RFC v1 11/19] mm, mempolicy: use first_node in mempolicy_slab

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Message-Id: <20191121151811.49742-12-fly@kernel.page>
Date:   Thu, 21 Nov 2019 23:18:03 +0800
From:   Pengfei Li <fly@...nel.page>
To:     akpm@...ux-foundation.org
Cc:     mgorman@...hsingularity.net, mhocko@...nel.org, vbabka@...e.cz,
        cl@...ux.com, iamjoonsoo.kim@....com, guro@...com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Pengfei Li <fly@...nel.page>
Subject: [RFC v1 11/19] mm, mempolicy: use first_node in mempolicy_slab_node()

In mempolicy_slab_node(), we want to access first node instead of
first zone, so use first_node_nlist instead of first_zone_nlist.

Signed-off-by: Pengfei Li <fly@...nel.page>
---
 mm/mempolicy.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index b1df19d42047..66184add1627 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1855,8 +1855,10 @@ static unsigned interleave_nodes(struct mempolicy *policy)
  */
 unsigned int mempolicy_slab_node(void)
 {
-	struct mempolicy *policy;
 	int node = numa_mem_id();
+	struct mempolicy *policy;
+	struct nodelist *nodelist;
+	int first_node;
 
 	if (in_interrupt())
 		return node;
@@ -1876,18 +1878,16 @@ unsigned int mempolicy_slab_node(void)
 		return interleave_nodes(policy);
 
 	case MPOL_BIND: {
-		struct zone *zone;
-
 		/*
 		 * Follow bind policy behavior and start allocation at the
 		 * first node.
 		 */
-		struct nodelist *nodelist;
-		enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL);
-		nodelist = &NODE_DATA(node)->node_nodelists[NODELIST_FALLBACK];
-		zone = first_zone_nlist_nodemask(nodelist, highest_zoneidx,
-							&policy->v.nodes);
-		return zone ? zone_to_nid(zone) : node;
+		nodelist = node_nodelist(node, GFP_KERNEL);
+
+		first_node = first_node_nlist_nodemask(nodelist,
+					gfp_zone(GFP_KERNEL), &policy->v.nodes);
+
+		return (first_node != NUMA_NO_NODE) ? first_node : node;
 	}
 
 	default:
-- 
2.23.0