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authorMichal Hocko <mhocko@suse.cz>2015-09-09 01:01:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-09 01:35:28 +0300
commit33398cf2f360c5ce24c8a22436d52a06ad4e5eb5 (patch)
treec4b967003133425ede67467188d8f96c033185c2 /include/linux/swap.h
parentb3d9ed3fd872fc074286674ae8595ee880938bbf (diff)
downloadlinux-33398cf2f360c5ce24c8a22436d52a06ad4e5eb5.tar.xz
memcg: export struct mem_cgroup
mem_cgroup structure is defined in mm/memcontrol.c currently which means that the code outside of this file has to use external API even for trivial access stuff. This patch exports mm_struct with its dependencies and makes some of the exported functions inlines. This even helps to reduce the code size a bit (make defconfig + CONFIG_MEMCG=y) text data bss dec hex filename 12355346 1823792 1089536 15268674 e8fb42 vmlinux.before 12354970 1823792 1089536 15268298 e8f9ca vmlinux.after This is not much (370B) but better than nothing. We also save a function call in some hot paths like callers of mem_cgroup_count_vm_event which is used for accounting. The patch doesn't introduce any functional changes. [vdavykov@parallels.com: inline memcg_kmem_is_active] [vdavykov@parallels.com: do not expose type outside of CONFIG_MEMCG] [akpm@linux-foundation.org: memcontrol.h needs eventfd.h for eventfd_ctx] [akpm@linux-foundation.org: export mem_cgroup_from_task() to modules] Signed-off-by: Michal Hocko <mhocko@suse.cz> Reviewed-by: Vladimir Davydov <vdavydov@parallels.com> Suggested-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/swap.h')
-rw-r--r--include/linux/swap.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 6282f1eb3d6a..2ce190709280 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -351,7 +351,15 @@ extern void check_move_unevictable_pages(struct page **, int nr_pages);
extern int kswapd_run(int nid);
extern void kswapd_stop(int nid);
#ifdef CONFIG_MEMCG
-extern int mem_cgroup_swappiness(struct mem_cgroup *mem);
+static inline int mem_cgroup_swappiness(struct mem_cgroup *memcg)
+{
+ /* root ? */
+ if (mem_cgroup_disabled() || !memcg->css.parent)
+ return vm_swappiness;
+
+ return memcg->swappiness;
+}
+
#else
static inline int mem_cgroup_swappiness(struct mem_cgroup *mem)
{