Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-fixes

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-fixes:
  sched: fix share (re)distribution
  softlockup: fix NOHZ wakeup
  seqlock: livelock fix

2 files changed, 3 insertions, 45 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 09ca69b2c17d..9e19287f3359 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1657,42 +1657,6 @@ void aggregate_group_weight(struct task_group *tg, struct sched_domain *sd)
 }
 
 /*
- * Redistribute tg->shares amongst all tg->cfs_rq[]s.
- */
-static void __aggregate_redistribute_shares(struct task_group *tg)
-{
-        int i, max_cpu = smp_processor_id();
-        unsigned long rq_weight = 0;
-        unsigned long shares, max_shares = 0, shares_rem = tg->shares;
-
-        for_each_possible_cpu(i)
-                rq_weight += tg->cfs_rq[i]->load.weight;
-
-        for_each_possible_cpu(i) {
-                /*
-                 * divide shares proportional to the rq_weights.
-                 */
-                shares = tg->shares * tg->cfs_rq[i]->load.weight;
-                shares /= rq_weight + 1;
-
-                tg->cfs_rq[i]->shares = shares;
-
-                if (shares > max_shares) {
-                        max_shares = shares;
-                        max_cpu = i;
-                }
-                shares_rem -= shares;
-        }
-
-        /*
-         * Ensure it all adds up to tg->shares; we can loose a few
-         * due to rounding down when computing the per-cpu shares.
-         */
-        if (shares_rem)
-                tg->cfs_rq[max_cpu]->shares += shares_rem;
-}
-
-/*
  * Compute the weight of this group on the given cpus.
  */
 static
@@ -1701,18 +1665,11 @@ void aggregate_group_shares(struct task_group *tg, struct sched_domain *sd)
         unsigned long shares = 0;
         int i;
 
-again:
         for_each_cpu_mask(i, sd->span)
                 shares += tg->cfs_rq[i]->shares;
 
-        /*
-         * When the span doesn't have any shares assigned, but does have
-         * tasks to run do a machine wide rebalance (should be rare).
-         */
-        if (unlikely(!shares && aggregate(tg, sd)->rq_weight)) {
-                __aggregate_redistribute_shares(tg);
-                goto again;
-        }
+        if ((!shares && aggregate(tg, sd)->rq_weight) || shares > tg->shares)
+                shares = tg->shares;
 
         aggregate(tg, sd)->shares = shares;
 }
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index d358d4e3a958..b854a895591e 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -393,6 +393,7 @@ void tick_nohz_restart_sched_tick(void)
                 sub_preempt_count(HARDIRQ_OFFSET);
         }
 
+        touch_softlockup_watchdog();
         /*
          * Cancel the scheduled timer and restore the tick
          */