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Subject[PATCH v6 04/13] mm/demotion/dax/kmem: Set node's memory tier to MEMORY_TIER_PMEM
Date
By default, all nodes are assigned to DEFAULT_MEMORY_TIER which
is the memory tier designated for nodes with DRAM

Set dax kmem device node's tier to MEMORY_TIER_PMEM. MEMORY_TIER_PMEM
is assigned a default rank value of 100 and appears below DEFAULT_MEMORY_TIER
in demotion order.

Signed-off-by: Jagdish Gediya <jvgediya@linux.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
drivers/dax/kmem.c | 4 ++
include/linux/memory-tiers.h | 1 +
mm/memory-tiers.c | 78 ++++++++++++++++++++++++++++++++++++
3 files changed, 83 insertions(+)

diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index a37622060fff..0cb3de3d138f 100644
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -11,6 +11,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
+#include <linux/memory-tiers.h>
#include "dax-private.h"
#include "bus.h"

@@ -147,6 +148,9 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax)

dev_set_drvdata(dev, data);

+#ifdef CONFIG_TIERED_MEMORY
+ node_create_and_set_memory_tier(numa_node, MEMORY_TIER_PMEM);
+#endif
return 0;

err_request_mem:
diff --git a/include/linux/memory-tiers.h b/include/linux/memory-tiers.h
index 44c3c3b16a36..e102ec73ab80 100644
--- a/include/linux/memory-tiers.h
+++ b/include/linux/memory-tiers.h
@@ -18,6 +18,7 @@
#define MAX_MEMORY_TIERS 3

extern bool numa_demotion_enabled;
+int node_create_and_set_memory_tier(int node, int tier);
#else
#define numa_demotion_enabled false

diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
index c3123a457d90..00d393a5a628 100644
--- a/mm/memory-tiers.c
+++ b/mm/memory-tiers.c
@@ -67,6 +67,84 @@ static struct memory_tier *register_memory_tier(unsigned int tier,
return memtier;
}

+static struct memory_tier *__node_get_memory_tier(int node)
+{
+ struct memory_tier *memtier;
+
+ list_for_each_entry(memtier, &memory_tiers, list) {
+ if (node_isset(node, memtier->nodelist))
+ return memtier;
+ }
+ return NULL;
+}
+
+static struct memory_tier *__get_memory_tier_from_id(int id)
+{
+ struct memory_tier *memtier;
+
+ list_for_each_entry(memtier, &memory_tiers, list) {
+ if (memtier->id == id)
+ return memtier;
+ }
+ return NULL;
+}
+
+static int __node_create_and_set_memory_tier(int node, int tier)
+{
+ int ret = 0;
+ struct memory_tier *memtier;
+
+ memtier = __get_memory_tier_from_id(tier);
+ if (!memtier) {
+ int rank;
+
+ rank = get_rank_from_tier(tier);
+ if (rank == -1) {
+ ret = -EINVAL;
+ goto out;
+ }
+ memtier = register_memory_tier(tier, rank);
+ if (!memtier) {
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+ node_set(node, memtier->nodelist);
+out:
+ return ret;
+}
+
+int node_create_and_set_memory_tier(int node, int tier)
+{
+ struct memory_tier *current_tier;
+ int ret = 0;
+
+ mutex_lock(&memory_tier_lock);
+
+ current_tier = __node_get_memory_tier(node);
+ if (!current_tier) {
+ ret = __node_create_and_set_memory_tier(node, tier);
+ goto out;
+ }
+
+ if (current_tier->id == tier)
+ goto out;
+
+ node_clear(node, current_tier->nodelist);
+
+ ret = __node_create_and_set_memory_tier(node, tier);
+ if (ret) {
+ /* reset it back to older tier */
+ node_set(node, current_tier->nodelist);
+ goto out;
+ }
+out:
+ mutex_unlock(&memory_tier_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(node_create_and_set_memory_tier);
+
static int __init memory_tier_init(void)
{
struct memory_tier *memtier;
--
2.36.1
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