diff options
| author | Tejun Heo <tj@kernel.org> | 2011-12-13 03:12:22 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2011-12-13 03:12:22 +0100 |
| commit | 94196f51c1ee5bbad674de28c682b17d78adb8e6 (patch) | |
| tree | a4965645000e9766f06ee7b5eb2bab098cde0f8c | |
| parent | cgroup: don't use subsys->can_attach_task() or ->attach_task() (diff) | |
| download | linux-94196f51c1ee5bbad674de28c682b17d78adb8e6.tar.xz linux-94196f51c1ee5bbad674de28c682b17d78adb8e6.zip | |
cgroup, cpuset: don't use ss->pre_attach()
->pre_attach() is supposed to be called before migration, which is
observed during process migration but task migration does it the other
way around. The only ->pre_attach() user is cpuset which can do the
same operaitons in ->can_attach(). Collapse cpuset_pre_attach() into
cpuset_can_attach().
-v2: Patch contamination from later patch removed. Spotted by Paul
Menage.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul Menage <paul@paulmenage.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
| -rw-r--r-- | kernel/cpuset.c | 29 |
1 files changed, 12 insertions, 17 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 9a8a61301524..42e568306382 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1370,6 +1370,15 @@ static int fmeter_getrate(struct fmeter *fmp) return val; } +/* + * Protected by cgroup_lock. The nodemasks must be stored globally because + * dynamically allocating them is not allowed in can_attach, and they must + * persist until attach. + */ +static cpumask_var_t cpus_attach; +static nodemask_t cpuset_attach_nodemask_from; +static nodemask_t cpuset_attach_nodemask_to; + /* Called by cgroups to determine if a cpuset is usable; cgroup_mutex held */ static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, struct cgroup_taskset *tset) @@ -1396,29 +1405,16 @@ static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, if ((ret = security_task_setscheduler(task))) return ret; } - return 0; -} - -/* - * Protected by cgroup_lock. The nodemasks must be stored globally because - * dynamically allocating them is not allowed in pre_attach, and they must - * persist among pre_attach, and attach. - */ -static cpumask_var_t cpus_attach; -static nodemask_t cpuset_attach_nodemask_from; -static nodemask_t cpuset_attach_nodemask_to; - -/* Set-up work for before attaching each task. */ -static void cpuset_pre_attach(struct cgroup *cont) -{ - struct cpuset *cs = cgroup_cs(cont); + /* prepare for attach */ if (cs == &top_cpuset) cpumask_copy(cpus_attach, cpu_possible_mask); else guarantee_online_cpus(cs, cpus_attach); guarantee_online_mems(cs, &cpuset_attach_nodemask_to); + + return 0; } static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, @@ -1904,7 +1900,6 @@ struct cgroup_subsys cpuset_subsys = { .create = cpuset_create, .destroy = cpuset_destroy, .can_attach = cpuset_can_attach, - .pre_attach = cpuset_pre_attach, .attach = cpuset_attach, .populate = cpuset_populate, .post_clone = cpuset_post_clone, |