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Subject[tip:sched/core] sched/fair: Explain LLC nohz kick condition
Commit-ID:  892d59c22208be820a5463b5f74eb7f0b7f2b03a
Gitweb: https://git.kernel.org/tip/892d59c22208be820a5463b5f74eb7f0b7f2b03a
Author: Valentin Schneider <valentin.schneider@arm.com>
AuthorDate: Thu, 17 Jan 2019 15:34:08 +0000
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 11 Feb 2019 08:02:17 +0100

sched/fair: Explain LLC nohz kick condition

Provide a comment explaining the LLC related nohz kick in
nohz_balancer_kick().

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dietmar.Eggemann@arm.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: morten.rasmussen@arm.com
Cc: vincent.guittot@linaro.org
Link: https://lkml.kernel.org/r/20190117153411.2390-3-valentin.schneider@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/sched/fair.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0692c8ff6ff6..ac6b52d8c79e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9601,8 +9601,13 @@ static void nohz_balancer_kick(struct rq *rq)
sds = rcu_dereference(per_cpu(sd_llc_shared, cpu));
if (sds) {
/*
- * XXX: write a coherent comment on why we do this.
- * See also: http://lkml.kernel.org/r/20111202010832.602203411@sbsiddha-desk.sc.intel.com
+ * If there is an imbalance between LLC domains (IOW we could
+ * increase the overall cache use), we need some less-loaded LLC
+ * domain to pull some load. Likewise, we may need to spread
+ * load within the current LLC domain (e.g. packed SMT cores but
+ * other CPUs are idle). We can't really know from here how busy
+ * the others are - so just get a nohz balance going if it looks
+ * like this LLC domain has tasks we could move.
*/
nr_busy = atomic_read(&sds->nr_busy_cpus);
if (nr_busy > 1) {
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