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Subject[PATCH v2 12/14] Keep number of running processes per-cgroup
Date
This relies on the fact that the scheduler classes keep the number
of running processes internally in their entities.

Signed-off-by: Glauber Costa <glommer@parallels.com>
---
kernel/sched.c | 15 ++++++++++++++-
1 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 6ef6e1b..d93cfd4 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -9763,6 +9763,7 @@ int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft,
struct timespec boottime;
unsigned long tg_iowait = 0;
u64 tg_nr_switches = 0;
+ unsigned long tg_nr_running = 0;
#ifdef CONFIG_CGROUP_SCHED
struct task_group *tg;
struct task_group *sib;
@@ -9822,6 +9823,18 @@ int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft,
}
#endif
kstat_unlock();
+#ifdef CONFIG_CGROUP_SCHED
+ /* root task group has autogrouping, so this doesn't hold */
+ if (tg != &root_task_group) {
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ tg_nr_running += cpu_rq(i)->cfs.nr_running;
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
+ tg_nr_running += cpu_rq(i)->rt.rt_nr_running;
+#endif
+ } else
+#endif
+ tg_nr_running += cpu_rq(i)->nr_running;

for (j = 0; j < NR_SOFTIRQS; j++) {
unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
@@ -9911,7 +9924,7 @@ int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft,
tg_nr_switches,
(unsigned long)jif,
total_forks,
- nr_running(),
+ tg_nr_running,
tg_iowait),

seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
--
1.7.6.4


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