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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 /include/linux/migrate.h
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>
Diffstat (limited to 'include/linux/migrate.h')
-rw-r--r--include/linux/migrate.h4
1 files changed, 4 insertions, 0 deletions
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