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authorMiklos Szeredi <mszeredi@suse.cz>2011-03-23 02:30:52 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 03:44:02 +0300
commitef6a3c63112e865d632ff7c478ba7c7160cad0d1 (patch)
treed0bd3ee2b79674e22b8dd3f318814cd4789697b8 /include/linux/memcontrol.h
parent318b275fbca1ab9ec0862de71420e0e92c3d1aa7 (diff)
downloadlinux-ef6a3c63112e865d632ff7c478ba7c7160cad0d1.tar.xz
mm: add replace_page_cache_page() function
This function basically does: remove_from_page_cache(old); page_cache_release(old); add_to_page_cache_locked(new); Except it does this atomically, so there's no possibility for the "add" to fail because of a race. If memory cgroups are enabled, then the memory cgroup charge is also moved from the old page to the new. This function is currently used by fuse to move pages into the page cache on read, instead of copying the page contents. [minchan.kim@gmail.com: add freepage() hook to replace_page_cache_page()] Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/memcontrol.h')
-rw-r--r--include/linux/memcontrol.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index f512e189be5a..a1a1e5384f6e 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -96,7 +96,7 @@ extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
extern int
mem_cgroup_prepare_migration(struct page *page,
- struct page *newpage, struct mem_cgroup **ptr);
+ struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
struct page *oldpage, struct page *newpage, bool migration_ok);
@@ -249,7 +249,7 @@ static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
static inline int
mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
- struct mem_cgroup **ptr)
+ struct mem_cgroup **ptr, gfp_t gfp_mask)
{
return 0;
}