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authorYang Shi <shy828301@gmail.com>2021-11-05 23:43:35 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-06 23:30:41 +0300
commit20f9ba4f995247bb79e243741b8fdddbd76dd923 (patch)
tree3cff618b212a94b4b4a80edb0c3084d39b0313a6
parent8eb42beac8d369f5443addd469879d152422a28d (diff)
downloadlinux-20f9ba4f995247bb79e243741b8fdddbd76dd923.tar.xz
mm: migrate: make demotion knob depend on migration
The memory demotion needs to call migrate_pages() to do the jobs. And it is controlled by a knob, however, the knob doesn't depend on CONFIG_MIGRATION. The knob could be truned on even though MIGRATION is disabled, this will not cause any crash since migrate_pages() would just return -ENOSYS. But it is definitely not optimal to go through demotion path then retry regular swap every time. And it doesn't make too much sense to have the knob visible to the users when !MIGRATION. Move the related code from mempolicy.[h|c] to migrate.[h|c]. Link: https://lkml.kernel.org/r/20211015005559.246709-1-shy828301@gmail.com Signed-off-by: Yang Shi <shy828301@gmail.com> Acked-by: "Huang, Ying" <ying.huang@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/mempolicy.h4
-rw-r--r--include/linux/migrate.h4
-rw-r--r--mm/mempolicy.c61
-rw-r--r--mm/migrate.c61
4 files changed, 65 insertions, 65 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 097bbbb37493..3c7595e81150 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -183,8 +183,6 @@ extern bool vma_migratable(struct vm_area_struct *vma);
extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long);
extern void mpol_put_task_policy(struct task_struct *);
-extern bool numa_demotion_enabled;
-
static inline bool mpol_is_preferred_many(struct mempolicy *pol)
{
return (pol->mode == MPOL_PREFERRED_MANY);
@@ -300,8 +298,6 @@ static inline nodemask_t *policy_nodemask_current(gfp_t gfp)
return NULL;
}
-#define numa_demotion_enabled false
-
static inline bool mpol_is_preferred_many(struct mempolicy *pol)
{
return false;
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 3d154fe03c96..2d8130e05dc0 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -40,6 +40,8 @@ extern int migrate_huge_page_move_mapping(struct address_space *mapping,
struct page *newpage, struct page *page);
extern int migrate_page_move_mapping(struct address_space *mapping,
struct page *newpage, struct page *page, int extra_count);
+
+extern bool numa_demotion_enabled;
#else
static inline void putback_movable_pages(struct list_head *l) {}
@@ -65,6 +67,8 @@ static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
{
return -ENOSYS;
}
+
+#define numa_demotion_enabled false
#endif /* CONFIG_MIGRATION */
#ifdef CONFIG_COMPACTION
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index ce722333d9f6..f1080e0a566a 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -3057,64 +3057,3 @@ void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
p += scnprintf(p, buffer + maxlen - p, ":%*pbl",
nodemask_pr_args(&nodes));
}
-
-bool numa_demotion_enabled = false;
-
-#ifdef CONFIG_SYSFS
-static ssize_t numa_demotion_enabled_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
-{
- return sysfs_emit(buf, "%s\n",
- numa_demotion_enabled? "true" : "false");
-}
-
-static ssize_t numa_demotion_enabled_store(struct kobject *kobj,
- struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- if (!strncmp(buf, "true", 4) || !strncmp(buf, "1", 1))
- numa_demotion_enabled = true;
- else if (!strncmp(buf, "false", 5) || !strncmp(buf, "0", 1))
- numa_demotion_enabled = false;
- else
- return -EINVAL;
-
- return count;
-}
-
-static struct kobj_attribute numa_demotion_enabled_attr =
- __ATTR(demotion_enabled, 0644, numa_demotion_enabled_show,
- numa_demotion_enabled_store);
-
-static struct attribute *numa_attrs[] = {
- &numa_demotion_enabled_attr.attr,
- NULL,
-};
-
-static const struct attribute_group numa_attr_group = {
- .attrs = numa_attrs,
-};
-
-static int __init numa_init_sysfs(void)
-{
- int err;
- struct kobject *numa_kobj;
-
- numa_kobj = kobject_create_and_add("numa", mm_kobj);
- if (!numa_kobj) {
- pr_err("failed to create numa kobject\n");
- return -ENOMEM;
- }
- err = sysfs_create_group(numa_kobj, &numa_attr_group);
- if (err) {
- pr_err("failed to register numa group\n");
- goto delete_obj;
- }
- return 0;
-
-delete_obj:
- kobject_put(numa_kobj);
- return err;
-}
-subsys_initcall(numa_init_sysfs);
-#endif
diff --git a/mm/migrate.c b/mm/migrate.c
index 1852d787e6ab..51e310a94516 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -3306,3 +3306,64 @@ static int __init migrate_on_reclaim_init(void)
}
late_initcall(migrate_on_reclaim_init);
#endif /* CONFIG_HOTPLUG_CPU */
+
+bool numa_demotion_enabled = false;
+
+#ifdef CONFIG_SYSFS
+static ssize_t numa_demotion_enabled_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "%s\n",
+ numa_demotion_enabled ? "true" : "false");
+}
+
+static ssize_t numa_demotion_enabled_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ if (!strncmp(buf, "true", 4) || !strncmp(buf, "1", 1))
+ numa_demotion_enabled = true;
+ else if (!strncmp(buf, "false", 5) || !strncmp(buf, "0", 1))
+ numa_demotion_enabled = false;
+ else
+ return -EINVAL;
+
+ return count;
+}
+
+static struct kobj_attribute numa_demotion_enabled_attr =
+ __ATTR(demotion_enabled, 0644, numa_demotion_enabled_show,
+ numa_demotion_enabled_store);
+
+static struct attribute *numa_attrs[] = {
+ &numa_demotion_enabled_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group numa_attr_group = {
+ .attrs = numa_attrs,
+};
+
+static int __init numa_init_sysfs(void)
+{
+ int err;
+ struct kobject *numa_kobj;
+
+ numa_kobj = kobject_create_and_add("numa", mm_kobj);
+ if (!numa_kobj) {
+ pr_err("failed to create numa kobject\n");
+ return -ENOMEM;
+ }
+ err = sysfs_create_group(numa_kobj, &numa_attr_group);
+ if (err) {
+ pr_err("failed to register numa group\n");
+ goto delete_obj;
+ }
+ return 0;
+
+delete_obj:
+ kobject_put(numa_kobj);
+ return err;
+}
+subsys_initcall(numa_init_sysfs);
+#endif