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authorValentin Schneider <valentin.schneider@arm.com>2019-02-11 17:59:46 +0000
committerIngo Molnar <mingo@kernel.org>2019-03-19 12:06:15 +0100
commitb9a7b8831600afc51c9ba52c05f12db2266f01c7 (patch)
tree6ba43d41cae48073c0fa5936e14b555214bafb6d /kernel
parenta0fe2cf086aef213d1b4bca1b1291a3dee8357c9 (diff)
sched/fair: Skip LLC NOHZ logic for asymmetric systems
The LLC NOHZ condition will become true as soon as >=2 CPUs in a single LLC domain are busy. On big.LITTLE systems, this translates to two or more CPUs of a "cluster" (big or LITTLE) being busy. Issuing a NOHZ kick in these conditions isn't desired for asymmetric systems, as if the busy CPUs can provide enough compute capacity to the running tasks, then we can leave the NOHZ CPUs in peace. Skip the LLC NOHZ condition for asymmetric systems, and rely on nr_running & capacity checks to trigger NOHZ kicks when the system actually needs them. Suggested-by: Morten Rasmussen <morten.rasmussen@arm.com> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dietmar.Eggemann@arm.com Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: vincent.guittot@linaro.org Link: https://lkml.kernel.org/r/20190211175946.4961-4-valentin.schneider@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/fair.c65
1 files changed, 37 insertions, 28 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f0d2f8a352bf..51003e1c794d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9603,24 +9603,6 @@ static void nohz_balancer_kick(struct rq *rq)
}
rcu_read_lock();
- sds = rcu_dereference(per_cpu(sd_llc_shared, cpu));
- if (sds) {
- /*
- * 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) {
- flags = NOHZ_KICK_MASK;
- goto unlock;
- }
-
- }
sd = rcu_dereference(rq->sd);
if (sd) {
@@ -9635,6 +9617,21 @@ static void nohz_balancer_kick(struct rq *rq)
}
}
+ sd = rcu_dereference(per_cpu(sd_asym_packing, cpu));
+ if (sd) {
+ /*
+ * When ASYM_PACKING; see if there's a more preferred CPU
+ * currently idle; in which case, kick the ILB to move tasks
+ * around.
+ */
+ for_each_cpu_and(i, sched_domain_span(sd), nohz.idle_cpus_mask) {
+ if (sched_asym_prefer(i, cpu)) {
+ flags = NOHZ_KICK_MASK;
+ goto unlock;
+ }
+ }
+ }
+
sd = rcu_dereference(per_cpu(sd_asym_cpucapacity, cpu));
if (sd) {
/*
@@ -9645,20 +9642,32 @@ static void nohz_balancer_kick(struct rq *rq)
flags = NOHZ_KICK_MASK;
goto unlock;
}
+
+ /*
+ * For asymmetric systems, we do not want to nicely balance
+ * cache use, instead we want to embrace asymmetry and only
+ * ensure tasks have enough CPU capacity.
+ *
+ * Skip the LLC logic because it's not relevant in that case.
+ */
+ goto unlock;
}
- sd = rcu_dereference(per_cpu(sd_asym_packing, cpu));
- if (sd) {
+ sds = rcu_dereference(per_cpu(sd_llc_shared, cpu));
+ if (sds) {
/*
- * When ASYM_PACKING; see if there's a more preferred CPU
- * currently idle; in which case, kick the ILB to move tasks
- * around.
+ * 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.
*/
- for_each_cpu_and(i, sched_domain_span(sd), nohz.idle_cpus_mask) {
- if (sched_asym_prefer(i, cpu)) {
- flags = NOHZ_KICK_MASK;
- goto unlock;
- }
+ nr_busy = atomic_read(&sds->nr_busy_cpus);
+ if (nr_busy > 1) {
+ flags = NOHZ_KICK_MASK;
+ goto unlock;
}
}
unlock: