sched/fair: Fix bandwidth timer clock drift condition

I noticed that cgroup task groups constantly get throttled even
if they have low CPU usage, this causes some jitters on the response
time to some of our business containers when enabling CPU quotas.

It's very simple to reproduce:

  mkdir /sys/fs/cgroup/cpu/test
  cd /sys/fs/cgroup/cpu/test
  echo 100000 > cpu.cfs_quota_us
  echo $$ > tasks

then repeat:

  cat cpu.stat | grep nr_throttled  # nr_throttled will increase steadily

After some analysis, we found that cfs_rq::runtime_remaining will
be cleared by expire_cfs_rq_runtime() due to two equal but stale
"cfs_{b|q}->runtime_expires" after period timer is re-armed.

The current condition to judge clock drift in expire_cfs_rq_runtime()
is wrong, the two runtime_expires are actually the same when clock
drift happens, so this condtion can never hit. The orginal design was
correctly done by this commit:

  a9cf55b28610 ("sched: Expire invalid runtime")

... but was changed to be the current implementation due to its locking bug.

This patch introduces another way, it adds a new field in both structures
cfs_rq and cfs_bandwidth to record the expiration update sequence, and
uses them to figure out if clock drift happens (true if they are equal).

Signed-off-by: Xunlei Pang <xlpang@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ben Segall <bsegall@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 51f2176d74ac ("sched/fair: Fix unlocked reads of some cfs_b->quota/period")
Link: http://lkml.kernel.org/r/20180620101834.24455-1-xlpang@linux.alibaba.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1866e64..791707c 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4590,6 +4590,7 @@ void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b)
        now = sched_clock_cpu(smp_processor_id());
        cfs_b->runtime = cfs_b->quota;
        cfs_b->runtime_expires = now + ktime_to_ns(cfs_b->period);
+       cfs_b->expires_seq++;
 }
 
 static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
@@ -4612,6 +4613,7 @@ static int assign_cfs_rq_runtime(struct cfs_rq *cfs_rq)
        struct task_group *tg = cfs_rq->tg;
        struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(tg);
        u64 amount = 0, min_amount, expires;
+       int expires_seq;
 
        /* note: this is a positive sum as runtime_remaining <= 0 */
        min_amount = sched_cfs_bandwidth_slice() - cfs_rq->runtime_remaining;
@@ -4628,6 +4630,7 @@ static int assign_cfs_rq_runtime(struct cfs_rq *cfs_rq)
                        cfs_b->idle = 0;
                }
        }
+       expires_seq = cfs_b->expires_seq;
        expires = cfs_b->runtime_expires;
        raw_spin_unlock(&cfs_b->lock);
 
@@ -4637,8 +4640,10 @@ static int assign_cfs_rq_runtime(struct cfs_rq *cfs_rq)
         * spread between our sched_clock and the one on which runtime was
         * issued.
         */
-       if ((s64)(expires - cfs_rq->runtime_expires) > 0)
+       if (cfs_rq->expires_seq != expires_seq) {
+               cfs_rq->expires_seq = expires_seq;
                cfs_rq->runtime_expires = expires;
+       }
 
        return cfs_rq->runtime_remaining > 0;
 }
@@ -4664,12 +4669,9 @@ static void expire_cfs_rq_runtime(struct cfs_rq *cfs_rq)
         * has not truly expired.
         *
         * Fortunately we can check determine whether this the case by checking
-        * whether the global deadline has advanced. It is valid to compare
-        * cfs_b->runtime_expires without any locks since we only care about
-        * exact equality, so a partial write will still work.
+        * whether the global deadline(cfs_b->expires_seq) has advanced.
         */
-
-       if (cfs_rq->runtime_expires != cfs_b->runtime_expires) {
+       if (cfs_rq->expires_seq == cfs_b->expires_seq) {
                /* extend local deadline, drift is bounded above by 2 ticks */
                cfs_rq->runtime_expires += TICK_NSEC;
        } else {

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 27ddec3..c7742dc 100644 (file)
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -334,9 +334,10 @@ struct cfs_bandwidth {
        u64                     runtime;
        s64                     hierarchical_quota;
        u64                     runtime_expires;
+       int                     expires_seq;
 
-       int                     idle;
-       int                     period_active;
+       short                   idle;
+       short                   period_active;
        struct hrtimer          period_timer;
        struct hrtimer          slack_timer;
        struct list_head        throttled_cfs_rq;
@@ -551,6 +552,7 @@ struct cfs_rq {
 
 #ifdef CONFIG_CFS_BANDWIDTH
        int                     runtime_enabled;
+       int                     expires_seq;
        u64                     runtime_expires;
        s64                     runtime_remaining;