linux-kernel - [PATCH v3 2/2] memory tier: dax/kmem: abstract memory types put

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Date: Wed, 20 Mar 2024 06:10:40 +0000
From: "Ho-Ren (Jack) Chuang" <horenchuang@...edance.com>
To: "Huang, Ying" <ying.huang@...el.com>,
	"Gregory Price" <gourry.memverge@...il.com>,
	aneesh.kumar@...ux.ibm.com,
	mhocko@...e.com,
	tj@...nel.org,
	john@...alactic.com,
	"Eishan Mirakhur" <emirakhur@...ron.com>,
	"Vinicius Tavares Petrucci" <vtavarespetr@...ron.com>,
	"Ravis OpenSrc" <Ravis.OpenSrc@...ron.com>,
	"Alistair Popple" <apopple@...dia.com>,
	"Srinivasulu Thanneeru" <sthanneeru@...ron.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	nvdimm@...ts.linux.dev,
	linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Cc: "Ho-Ren (Jack) Chuang" <horenc@...edu>,
	"Ho-Ren (Jack) Chuang" <horenchuang@...edance.com>,
	"Ho-Ren (Jack) Chuang" <horenchuang@...il.com>,
	qemu-devel@...gnu.org
Subject: [PATCH v3 2/2] memory tier: dax/kmem: abstract memory types put

Abstract `kmem_put_memory_types()` into `mt_put_memory_types()` to
accommodate various memory types and enhance flexibility,
similar to `mt_find_alloc_memory_type()`.

Signed-off-by: Ho-Ren (Jack) Chuang <horenchuang@...edance.com>
---
 drivers/dax/kmem.c           |  7 +------
 include/linux/memory-tiers.h |  6 ++++++
 mm/memory-tiers.c            | 12 ++++++++++++
 3 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index de1333aa7b3e..01399e5b53b2 100644
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -66,13 +66,8 @@ static struct memory_dev_type *kmem_find_alloc_memory_type(int adist)
 
 static void kmem_put_memory_types(void)
 {
-	struct memory_dev_type *mtype, *mtn;
-
 	mutex_lock(&kmem_memory_type_lock);
-	list_for_each_entry_safe(mtype, mtn, &kmem_memory_types, list) {
-		list_del(&mtype->list);
-		put_memory_type(mtype);
-	}
+	mt_put_memory_types(&kmem_memory_types);
 	mutex_unlock(&kmem_memory_type_lock);
 }
 
diff --git a/include/linux/memory-tiers.h b/include/linux/memory-tiers.h
index b2135334ac18..a44c03c2ba3a 100644
--- a/include/linux/memory-tiers.h
+++ b/include/linux/memory-tiers.h
@@ -50,6 +50,7 @@ int mt_set_default_dram_perf(int nid, struct access_coordinate *perf,
 int mt_perf_to_adistance(struct access_coordinate *perf, int *adist);
 struct memory_dev_type *mt_find_alloc_memory_type(int adist,
 							struct list_head *memory_types);
+void mt_put_memory_types(struct list_head *memory_types);
 #ifdef CONFIG_MIGRATION
 int next_demotion_node(int node);
 void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets);
@@ -143,5 +144,10 @@ struct memory_dev_type *mt_find_alloc_memory_type(int adist, struct list_head *m
 {
 	return NULL;
 }
+
+void mt_put_memory_types(struct list_head *memory_types)
+{
+
+}
 #endif	/* CONFIG_NUMA */
 #endif  /* _LINUX_MEMORY_TIERS_H */
diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
index d9b96b21b65a..6246c28546ba 100644
--- a/mm/memory-tiers.c
+++ b/mm/memory-tiers.c
@@ -662,6 +662,18 @@ struct memory_dev_type *mt_find_alloc_memory_type(int adist, struct list_head *m
 }
 EXPORT_SYMBOL_GPL(mt_find_alloc_memory_type);
 
+
+void mt_put_memory_types(struct list_head *memory_types)
+{
+	struct memory_dev_type *mtype, *mtn;
+
+	list_for_each_entry_safe(mtype, mtn, memory_types, list) {
+		list_del(&mtype->list);
+		put_memory_type(mtype);
+	}
+}
+EXPORT_SYMBOL_GPL(mt_put_memory_types);
+
 /*
  * This is invoked via late_initcall() to create
  * CPUless memory tiers after HMAT info is ready or
-- 
Ho-Ren (Jack) Chuang