From 2f7ee5691eecb67c8108b92001a85563ea336ac5 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 12 Dec 2011 18:12:21 -0800 Subject: cgroup: introduce cgroup_taskset and use it in subsys->can_attach(), cancel_attach() and attach() Currently, there's no way to pass multiple tasks to cgroup_subsys methods necessitating the need for separate per-process and per-task methods. This patch introduces cgroup_taskset which can be used to pass multiple tasks and their associated cgroups to cgroup_subsys methods. Three methods - can_attach(), cancel_attach() and attach() - are converted to use cgroup_taskset. This unifies passed parameters so that all methods have access to all information. Conversions in this patchset are identical and don't introduce any behavior change. -v2: documentation updated as per Paul Menage's suggestion. Signed-off-by: Tejun Heo Reviewed-by: KAMEZAWA Hiroyuki Reviewed-by: Frederic Weisbecker Acked-by: Paul Menage Acked-by: Li Zefan Cc: Balbir Singh Cc: Daisuke Nishimura Cc: KAMEZAWA Hiroyuki Cc: James Morris --- mm/memcontrol.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'mm') diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 6aff93c98ac..81640e74a70 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5298,8 +5298,9 @@ static void mem_cgroup_clear_mc(void) static int mem_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, - struct task_struct *p) + struct cgroup_taskset *tset) { + struct task_struct *p = cgroup_taskset_first(tset); int ret = 0; struct mem_cgroup *memcg = mem_cgroup_from_cont(cgroup); @@ -5337,7 +5338,7 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss, static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, - struct task_struct *p) + struct cgroup_taskset *tset) { mem_cgroup_clear_mc(); } @@ -5454,9 +5455,9 @@ retry: static void mem_cgroup_move_task(struct cgroup_subsys *ss, struct cgroup *cont, - struct cgroup *old_cont, - struct task_struct *p) + struct cgroup_taskset *tset) { + struct task_struct *p = cgroup_taskset_first(tset); struct mm_struct *mm = get_task_mm(p); if (mm) { @@ -5471,19 +5472,18 @@ static void mem_cgroup_move_task(struct cgroup_subsys *ss, #else /* !CONFIG_MMU */ static int mem_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, - struct task_struct *p) + struct cgroup_taskset *tset) { return 0; } static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, - struct task_struct *p) + struct cgroup_taskset *tset) { } static void mem_cgroup_move_task(struct cgroup_subsys *ss, struct cgroup *cont, - struct cgroup *old_cont, - struct task_struct *p) + struct cgroup_taskset *tset) { } #endif -- cgit v1.2.3-18-g5258