The global variable cleancache_enabled is read often but written to rarely. Use __read_mostly to prevent it being on the same cacheline as another variable which is written to often, which would cause cacheline bouncing. Signed-off-by: Cesar Eduardo Barros <cesarb@xxxxxxxxxx> --- include/linux/cleancache.h | 2 +- mm/cleancache.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/cleancache.h b/include/linux/cleancache.h index 04ffb2e..83fffe8 100644 --- a/include/linux/cleancache.h +++ b/include/linux/cleancache.h @@ -42,7 +42,7 @@ extern void __cleancache_put_page(struct page *); extern void __cleancache_flush_page(struct address_space *, struct page *); extern void __cleancache_flush_inode(struct address_space *); extern void __cleancache_flush_fs(struct super_block *); -extern int cleancache_enabled; +extern int cleancache_enabled __read_mostly; #ifdef CONFIG_CLEANCACHE static inline bool cleancache_fs_enabled(struct page *page) diff --git a/mm/cleancache.c b/mm/cleancache.c index bcaae4c..a3d7a22 100644 --- a/mm/cleancache.c +++ b/mm/cleancache.c @@ -24,7 +24,7 @@ * disabled), so is preferred to the slower alternative: a function * call that checks a non-global. */ -int cleancache_enabled; +int cleancache_enabled __read_mostly; EXPORT_SYMBOL(cleancache_enabled); /* -- 1.7.4.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>