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Commit 8947f9d5 authored by Li Zefan's avatar Li Zefan Committed by Linus Torvalds
Browse files

cgroups: annotate two variables with __read_mostly 



- need_forkexit_callback will be read only after system boot.
- use_task_css_set_links will be read only after it's set.

And these 2 variables are checked when a new process is forked.

Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Acked-by: default avatarPaul Menage <menage@google.com>
Acked-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 71cbb949

kernel/cgroup.c

+2 −2
Original line number Diff line number Diff line
@@ -118,7 +118,7 @@ static int root_count; 
 * extra work in the fork/exit path if none of the subsystems need to

 * be called.

 */

static int need_forkexit_callback;

static int need_forkexit_callback __read_mostly;

static int need_mm_owner_callback __read_mostly;



/* convenient tests for these bits */
@@ -220,7 +220,7 @@ static struct hlist_head *css_set_hash(struct cgroup_subsys_state *css[]) 
 * task until after the first call to cgroup_iter_start(). This

 * reduces the fork()/exit() overhead for people who have cgroups

 * compiled into their kernel but not actually in use */

static int use_task_css_set_links;

static int use_task_css_set_links __read_mostly;



/* When we create or destroy a css_set, the operation simply

 * takes/releases a reference count on all the cgroups referenced