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SubjectRe: [PATCH] Add a file named cgroup.procs_stat in cgroup
On Fri, May 04, 2018 at 10:28:20PM +0800, zhangq95 wrote:
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 5e10aae..ba969af 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -3404,11 +3404,19 @@ static void __sched notrace __schedule(bool preempt)
> struct rq_flags rf;
> struct rq *rq;
> int cpu;
> + struct task_struct *prev_root = NULL, *next_root = NULL;
>
> cpu = smp_processor_id();
> rq = cpu_rq(cpu);
> prev = rq->curr;
>
> + if (task_active_pid_ns(prev)) {
> + prev_root = task_active_pid_ns(prev)->child_reaper;
> + if (prev_root != init_pid_ns.child_reaper)
> + update_cpuacct_procs_stat(prev, prev->cpu,
> + CPUACCT_PROCS_SWITCHES, 1, 0);
> + }
> +
> schedule_debug(prev);
>
> if (sched_feat(HRTICK))
> @@ -3462,6 +3470,12 @@ static void __sched notrace __schedule(bool preempt)
> }
>
> next = pick_next_task(rq, prev, &rf);
> + if (task_active_pid_ns(next)) {
> + next_root = task_active_pid_ns(next)->child_reaper;
> + if (prev_root && prev_root != next_root)
> + update_cpuacct_procs_stat(next, next->cpu,
> + CPUACCT_PROCS_SWITCHES, 1, 0);
> + }
> clear_tsk_need_resched(prev);
> clear_preempt_need_resched();
>

> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 54dc31e..46adf63 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -4757,6 +4774,7 @@ static void throttle_cfs_rq(struct cfs_rq *cfs_rq)
> if (dequeue)
> dequeue_entity(qcfs_rq, se, DEQUEUE_SLEEP);
> qcfs_rq->h_nr_running -= task_delta;
> + update_cpuacct_running_from_cfs(qcfs_rq, -task_delta);
>
> if (qcfs_rq->load.weight)
> dequeue = 0;
> @@ -4820,6 +4838,7 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
> if (enqueue)
> enqueue_entity(cfs_rq, se, ENQUEUE_WAKEUP);
> cfs_rq->h_nr_running += task_delta;
> + update_cpuacct_running_from_cfs(cfs_rq, task_delta);
>
> if (cfs_rq_throttled(cfs_rq))
> break;
> @@ -5379,6 +5398,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
> if (cfs_rq_throttled(cfs_rq))
> break;
> cfs_rq->h_nr_running++;
> + update_cpuacct_running_from_cfs(cfs_rq, 1);
>
> flags = ENQUEUE_WAKEUP;
> }
> @@ -5386,6 +5406,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
> for_each_sched_entity(se) {
> cfs_rq = cfs_rq_of(se);
> cfs_rq->h_nr_running++;
> + update_cpuacct_running_from_cfs(cfs_rq, 1);
>
> if (cfs_rq_throttled(cfs_rq))
> break;
> @@ -5427,6 +5448,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
> if (cfs_rq_throttled(cfs_rq))
> break;
> cfs_rq->h_nr_running--;
> + update_cpuacct_running_from_cfs(cfs_rq, -1);
>
> /* Don't dequeue parent if it has other entities besides us */
> if (cfs_rq->load.weight) {
> @@ -5446,6 +5468,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
> for_each_sched_entity(se) {
> cfs_rq = cfs_rq_of(se);
> cfs_rq->h_nr_running--;
> + update_cpuacct_running_from_cfs(cfs_rq, -1);
>
> if (cfs_rq_throttled(cfs_rq))
> break;
> diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
> index 7aef6b4..766ec16 100644
> --- a/kernel/sched/rt.c
> +++ b/kernel/sched/rt.c
> @@ -1327,6 +1327,7 @@ enqueue_task_rt(struct rq *rq, struct task_struct *p, int flags)
> rt_se->timeout = 0;
>
> enqueue_rt_entity(rt_se, flags);
> + update_cpuacct_procs_stat(p, cpu_of(rq), CPUACCT_PROCS_RUNNING, 1, 0);
>
> if (!task_current(rq, p) && p->nr_cpus_allowed > 1)
> enqueue_pushable_task(rq, p);
> @@ -1338,6 +1339,7 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int flags)
>
> update_curr_rt(rq);
> dequeue_rt_entity(rt_se, flags);
> + update_cpuacct_procs_stat(p, cpu_of(rq), CPUACCT_PROCS_RUNNING, -1, 0);
>
> dequeue_pushable_task(rq, p);
> }


Yeah, I think not... death by accounting.

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