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authorYong Zhang <yong.zhang0@gmail.com>2011-06-28 10:51:31 +0800
committerIngo Molnar <mingo@elte.hu>2011-07-01 10:39:08 +0200
commit1c09ab0d257317f97e8629a3d0c8713d6dd9de4c (patch)
tree81562207cd4b6f6579275d61ea92a7d7b6bbd9ef
parent307bf9803f25a8a3f53c1012110fb74e2f893eb0 (diff)
downloadop-kernel-dev-1c09ab0d257317f97e8629a3d0c8713d6dd9de4c.zip
op-kernel-dev-1c09ab0d257317f97e8629a3d0c8713d6dd9de4c.tar.gz
sched: Skip autogroup when looking for all rt sched groups
Since commit ec514c48 ("sched: Fix rt_rq runtime leakage bug") 'cat /proc/sched_debug' will print data of root_task_group.rt_rq multiple times. This is because autogroup does not have its own rt group, instead rt group of autogroup is linked to root_task_group. So skip it when we are looking for all rt sched groups, and it will also save some noop operation against root_task_group when __disable_runtime()/__enable_runtime(). -v2: Based on Cheng Xu's idea which uses less code. Signed-off-by: Yong Zhang <yong.zhang0@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Cheng Xu <chengxu@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/BANLkTi=87P3RoTF_UEtamNfc_XGxQXE__Q@mail.gmail.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/sched_autogroup.h1
-rw-r--r--kernel/sched_rt.c22
2 files changed, 18 insertions, 5 deletions
diff --git a/kernel/sched_autogroup.h b/kernel/sched_autogroup.h
index 0557705..c2f0e72 100644
--- a/kernel/sched_autogroup.h
+++ b/kernel/sched_autogroup.h
@@ -13,6 +13,7 @@ struct autogroup {
int nice;
};
+static inline bool task_group_is_autogroup(struct task_group *tg);
static inline struct task_group *
autogroup_task_group(struct task_struct *p, struct task_group *tg);
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index b03cd89..97540f0 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -185,11 +185,23 @@ static inline u64 sched_rt_period(struct rt_rq *rt_rq)
typedef struct task_group *rt_rq_iter_t;
-#define for_each_rt_rq(rt_rq, iter, rq) \
- for (iter = list_entry_rcu(task_groups.next, typeof(*iter), list); \
- (&iter->list != &task_groups) && \
- (rt_rq = iter->rt_rq[cpu_of(rq)]); \
- iter = list_entry_rcu(iter->list.next, typeof(*iter), list))
+static inline struct task_group *next_task_group(struct task_group *tg)
+{
+ do {
+ tg = list_entry_rcu(tg->list.next,
+ typeof(struct task_group), list);
+ } while (&tg->list != &task_groups && task_group_is_autogroup(tg));
+
+ if (&tg->list == &task_groups)
+ tg = NULL;
+
+ return tg;
+}
+
+#define for_each_rt_rq(rt_rq, iter, rq) \
+ for (iter = container_of(&task_groups, typeof(*iter), list); \
+ (iter = next_task_group(iter)) && \
+ (rt_rq = iter->rt_rq[cpu_of(rq)]);)
static inline void list_add_leaf_rt_rq(struct rt_rq *rt_rq)
{
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