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mm: migrate: make demotion knob depend on migration

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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>
This commit is contained in:
Yang Shi 2021-11-05 13:43:35 -07:00 • committed by Linus Torvalds
parent 8eb42beac8
commit 20f9ba4f99
4 changed files with 65 additions and 65 deletions
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4
include/linux/mempolicy.h
View file

@ -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;

4
include/linux/migrate.h
View file

@ -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