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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-11 18:05:37 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-11 18:05:37 -0800 |
| commit | 608ff1a210ab0e8b969399039bf8e18693605910 (patch) | |
| tree | faea7bb1764461c73d0953089bd5439d91733a03 /include/linux/migrate.h | |
| parent | 414a6750e59b0b687034764c464e9ddecac0f7a6 (diff) | |
| parent | 74d42d8fe146e870c52bde3b1c692f86cc8ff844 (diff) | |
| download | op-kernel-dev-608ff1a210ab0e8b969399039bf8e18693605910.zip op-kernel-dev-608ff1a210ab0e8b969399039bf8e18693605910.tar.gz | |
Merge branch 'akpm' (Andrew's patchbomb)
Merge misc updates from Andrew Morton:
"About half of most of MM. Going very early this time due to
uncertainty over the coreautounifiednumasched things. I'll send the
other half of most of MM tomorrow. The rest of MM awaits a slab merge
from Pekka."
* emailed patches from Andrew Morton: (71 commits)
memory_hotplug: ensure every online node has NORMAL memory
memory_hotplug: handle empty zone when online_movable/online_kernel
mm, memory-hotplug: dynamic configure movable memory and portion memory
drivers/base/node.c: cleanup node_state_attr[]
bootmem: fix wrong call parameter for free_bootmem()
avr32, kconfig: remove HAVE_ARCH_BOOTMEM
mm: cma: remove watermark hacks
mm: cma: skip watermarks check for already isolated blocks in split_free_page()
mm, oom: fix race when specifying a thread as the oom origin
mm, oom: change type of oom_score_adj to short
mm: cleanup register_node()
mm, mempolicy: remove duplicate code
mm/vmscan.c: try_to_freeze() returns boolean
mm: introduce putback_movable_pages()
virtio_balloon: introduce migration primitives to balloon pages
mm: introduce compaction and migration for ballooned pages
mm: introduce a common interface for balloon pages mobility
mm: redefine address_space.assoc_mapping
mm: adjust address_space_operations.migratepage() return code
arch/sparc/kernel/sys_sparc_64.c: s/COLOUR/COLOR/
...
Diffstat (limited to 'include/linux/migrate.h')
| -rw-r--r-- | include/linux/migrate.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h index ce7e667..0b5865c6 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -7,9 +7,27 @@ typedef struct page *new_page_t(struct page *, unsigned long private, int **); +/* + * Return values from addresss_space_operations.migratepage(): + * - negative errno on page migration failure; + * - zero on page migration success; + * + * The balloon page migration introduces this special case where a 'distinct' + * return code is used to flag a successful page migration to unmap_and_move(). + * This approach is necessary because page migration can race against balloon + * deflation procedure, and for such case we could introduce a nasty page leak + * if a successfully migrated balloon page gets released concurrently with + * migration's unmap_and_move() wrap-up steps. + */ +#define MIGRATEPAGE_SUCCESS 0 +#define MIGRATEPAGE_BALLOON_SUCCESS 1 /* special ret code for balloon page + * sucessful migration case. + */ + #ifdef CONFIG_MIGRATION extern void putback_lru_pages(struct list_head *l); +extern void putback_movable_pages(struct list_head *l); extern int migrate_page(struct address_space *, struct page *, struct page *, enum migrate_mode); extern int migrate_pages(struct list_head *l, new_page_t x, @@ -33,6 +51,7 @@ extern int migrate_huge_page_move_mapping(struct address_space *mapping, #else static inline void putback_lru_pages(struct list_head *l) {} +static inline void putback_movable_pages(struct list_head *l) {} static inline int migrate_pages(struct list_head *l, new_page_t x, unsigned long private, bool offlining, enum migrate_mode mode) { return -ENOSYS; } |
