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authorLinus Torvalds <torvalds@linux-foundation.org>2008-04-25 21:47:56 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-25 21:47:56 +0200
commit0b79dada976198cb1a4c043068e3b44d5cab2a5a (patch)
treefde938c698545a7c8764a2eac4304dee002bb281 /kernel/sched.c
parentMerge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff)
parentsched: fix share (re)distribution (diff)
downloadlinux-0b79dada976198cb1a4c043068e3b44d5cab2a5a.tar.xz
linux-0b79dada976198cb1a4c043068e3b44d5cab2a5a.zip
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
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c47
1 files changed, 2 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;
}