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cgroup: drop @skip_css from cgroup_taskset_for_each()

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If !NULL, @skip_css makes cgroup_taskset_for_each() skip the matching
css.  The intention of the interface is to make it easy to skip css's
(cgroup_subsys_states) which already match the migration target;
however, this is entirely unnecessary as migration taskset doesn't
include tasks which are already in the target cgroup.  Drop @skip_css
from cgroup_taskset_for_each().

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Daniel Borkmann <dborkman@redhat.com>
This commit is contained in:
Tejun Heo 2014-02-13 06:58:41 -05:00
parent cb0f1fe9ba
commit 924f0d9a20
8 changed files with 11 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

2
kernel/cgroup_freezer.c
View file

@ -187,7 +187,7 @@ static void freezer_attach(struct cgroup_subsys_state *new_css,
* current state before executing the following - !frozen tasks may
* be visible in a FROZEN cgroup and frozen tasks in a THAWED one.
*/
cgroup_taskset_for_each(task, new_css, tset) {
cgroup_taskset_for_each(task, tset) {
if (!(freezer->state & CGROUP_FREEZING)) {
__thaw_task(task);
} else {

4
kernel/cpuset.c
View file

@ -1398,7 +1398,7 @@ static int cpuset_can_attach(struct cgroup_subsys_state *css,
(cpumask_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed)))
goto out_unlock;
cgroup_taskset_for_each(task, css, tset) {
cgroup_taskset_for_each(task, tset) {
/*
* Kthreads which disallow setaffinity shouldn't be moved
* to a new cpuset; we don't want to change their cpu
@ -1467,7 +1467,7 @@ static void cpuset_attach(struct cgroup_subsys_state *css,
guarantee_online_mems(mems_cs, &cpuset_attach_nodemask_to);
cgroup_taskset_for_each(task, css, tset) {
cgroup_taskset_for_each(task, tset) {
/*
* can_attach beforehand should guarantee that this doesn't
* fail. TODO: have a better way to handle failure here

2
kernel/events/core.c
View file

@ -8021,7 +8021,7 @@ static void perf_cgroup_attach(struct cgroup_subsys_state *css,
{
struct task_struct *task;
cgroup_taskset_for_each(task, css, tset)
cgroup_taskset_for_each(task, tset)
task_function_call(task, __perf_cgroup_move, task);
}

4
kernel/sched/core.c
View file

@ -7600,7 +7600,7 @@ static int cpu_cgroup_can_attach(struct cgroup_subsys_state *css,
{
struct task_struct *task;
cgroup_taskset_for_each(task, css, tset) {
cgroup_taskset_for_each(task, tset) {
#ifdef CONFIG_RT_GROUP_SCHED
if (!sched_rt_can_attach(css_tg(css), task))
return -EINVAL;
@ -7618,7 +7618,7 @@ static void cpu_cgroup_attach(struct cgroup_subsys_state *css,
{
struct task_struct *task;
cgroup_taskset_for_each(task, css, tset)
cgroup_taskset_for_each(task, tset)
sched_move_task(task);
}