linux-kernel - [PATCH 1/4] numa: generalize numa_map_to_online

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Date:   Thu, 10 Aug 2023 09:24:39 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Yury Norov <yury.norov@...il.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Mel Gorman <mgorman@...e.de>,
        Peter Lafreniere <peter@...jl.ca>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tariq Toukan <tariqt@...dia.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        shiju.jose@...wei.com, jonathan.cameron@...wei.com,
        prime.zeng@...wei.com, linuxarm@...wei.com,
        yangyicong@...ilicon.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH 1/4] numa: generalize numa_map_to_online_node()

The function is in fact searches for the nearest node for a given one,
based on a N_ONLINE state. This is a common pattern to search for a
nearest node.

This patch converts numa_map_to_online_node(node) to
numa_nearest_node(node, state), so that others won't need opencode the
logic. The following patches apply it where applicable.

Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 include/linux/numa.h |  7 +++++--
 mm/mempolicy.c       | 18 +++++++++++-------
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/include/linux/numa.h b/include/linux/numa.h
index 59df211d051f..fb30a42f0700 100644
--- a/include/linux/numa.h
+++ b/include/linux/numa.h
@@ -25,7 +25,7 @@
 #include <asm/sparsemem.h>
 
 /* Generic implementation available */
-int numa_map_to_online_node(int node);
+int numa_nearest_node(int node, unsigned int state);
 
 #ifndef memory_add_physaddr_to_nid
 static inline int memory_add_physaddr_to_nid(u64 start)
@@ -44,10 +44,11 @@ static inline int phys_to_target_node(u64 start)
 }
 #endif
 #else /* !CONFIG_NUMA */
-static inline int numa_map_to_online_node(int node)
+static inline int numa_nearest_node(int node, unsigned int state)
 {
 	return NUMA_NO_NODE;
 }
+
 static inline int memory_add_physaddr_to_nid(u64 start)
 {
 	return 0;
@@ -58,6 +59,8 @@ static inline int phys_to_target_node(u64 start)
 }
 #endif
 
+#define numa_map_to_online_node(node) numa_nearest_node(node, N_ONLINE)
+
 #ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP
 extern const struct attribute_group arch_node_dev_group;
 #endif
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index c53f8beeb507..db74dd957d2c 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -131,22 +131,26 @@ static struct mempolicy default_policy = {
 static struct mempolicy preferred_node_policy[MAX_NUMNODES];
 
 /**
- * numa_map_to_online_node - Find closest online node
+ * numa_nearest_node - Find nearest node by state
  * @node: Node id to start the search
+ * @state: State to filter the search
  *
- * Lookup the next closest node by distance if @nid is not online.
+ * Lookup the closest node by distance if @nid is not in state.
  *
- * Return: this @node if it is online, otherwise the closest node by distance
+ * Return: this @node if it is in state, otherwise the closest node by distance
  */
-int numa_map_to_online_node(int node)
+int numa_nearest_node(int node, unsigned int state)
 {
 	int min_dist = INT_MAX, dist, n, min_node;
 
-	if (node == NUMA_NO_NODE || node_online(node))
+	if (state >= NR_NODE_STATES)
+		return -EINVAL;
+
+	if (node == NUMA_NO_NODE || node_state(node, state))
 		return node;
 
 	min_node = node;
-	for_each_online_node(n) {
+	for_each_node_state(n, state) {
 		dist = node_distance(node, n);
 		if (dist < min_dist) {
 			min_dist = dist;
@@ -156,7 +160,7 @@ int numa_map_to_online_node(int node)
 
 	return min_node;
 }
-EXPORT_SYMBOL_GPL(numa_map_to_online_node);
+EXPORT_SYMBOL_GPL(numa_nearest_node);
 
 struct mempolicy *get_task_policy(struct task_struct *p)
 {
-- 
2.39.2