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authorFrode Isaksen <fisaksen@baylibre.com>2017-12-19 11:15:35 +0000
committerJan-Simon Moeller <jsmoeller@linuxfoundation.org>2018-02-07 11:47:29 +0000
commitc4a6287185179732dfc1e903c195ff90c19f1065 (patch)
treed35f5010dbd952e40f5c178322026445b55757c1 /meta-eas/recipes-kernel/linux/linux-renesas/0004-sched-fair-Add-per-CPU-min-capacity-to-sched_group_c.patch
parent109dea1d5c5a38807b098b588584636ae636a302 (diff)
This layer provides Energy Aware Scheduling (EAS) patcheseel_5.1.0eel_5.0.3eel_5.0.2eel/5.1.0eel/5.0.3eel/5.0.25.1.05.0.35.0.2eel
For the moment only for Renesas R-Car Gen3 SoC's. Can be expanded for other SoC's by setting the machine feature biglittle and provide the relevant EAS patches. Bug-AGL: SPEC-813 Change-Id: I2b5e69c515c33e57be19b30466fe208d7b8ac1a5 Signed-off-by: Frode Isaksen <fisaksen@baylibre.com>
Diffstat (limited to 'meta-eas/recipes-kernel/linux/linux-renesas/0004-sched-fair-Add-per-CPU-min-capacity-to-sched_group_c.patch')
-rw-r--r--meta-eas/recipes-kernel/linux/linux-renesas/0004-sched-fair-Add-per-CPU-min-capacity-to-sched_group_c.patch143
1 files changed, 143 insertions, 0 deletions
diff --git a/meta-eas/recipes-kernel/linux/linux-renesas/0004-sched-fair-Add-per-CPU-min-capacity-to-sched_group_c.patch b/meta-eas/recipes-kernel/linux/linux-renesas/0004-sched-fair-Add-per-CPU-min-capacity-to-sched_group_c.patch
new file mode 100644
index 0000000..7932e0b
--- /dev/null
+++ b/meta-eas/recipes-kernel/linux/linux-renesas/0004-sched-fair-Add-per-CPU-min-capacity-to-sched_group_c.patch
@@ -0,0 +1,143 @@
+From 9a434b62bbd9621f05318569949b59d37a0f59ce Mon Sep 17 00:00:00 2001
+From: Morten Rasmussen <morten.rasmussen@arm.com>
+Date: Fri, 14 Oct 2016 14:41:09 +0100
+Subject: [PATCH 04/92] sched/fair: Add per-CPU min capacity to
+ sched_group_capacity
+
+struct sched_group_capacity currently represents the compute capacity
+sum of all CPUs in the sched_group.
+
+Unless it is divided by the group_weight to get the average capacity
+per CPU, it hides differences in CPU capacity for mixed capacity systems
+(e.g. high RT/IRQ utilization or ARM big.LITTLE).
+
+But even the average may not be sufficient if the group covers CPUs of
+different capacities.
+
+Instead, by extending struct sched_group_capacity to indicate min per-CPU
+capacity in the group a suitable group for a given task utilization can
+more easily be found such that CPUs with reduced capacity can be avoided
+for tasks with high utilization (not implemented by this patch).
+
+Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
+Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
+Cc: Linus Torvalds <torvalds@linux-foundation.org>
+Cc: Peter Zijlstra <peterz@infradead.org>
+Cc: Thomas Gleixner <tglx@linutronix.de>
+Cc: dietmar.eggemann@arm.com
+Cc: freedom.tan@mediatek.com
+Cc: keita.kobayashi.ym@renesas.com
+Cc: mgalbraith@suse.de
+Cc: sgurrappadi@nvidia.com
+Cc: vincent.guittot@linaro.org
+Cc: yuyang.du@intel.com
+Link: http://lkml.kernel.org/r/1476452472-24740-4-git-send-email-morten.rasmussen@arm.com
+Signed-off-by: Ingo Molnar <mingo@kernel.org>
+(cherry picked from commit bf475ce0a3dd75b5d1df6c6c14ae25168caa15ac)
+Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
+---
+ kernel/sched/core.c | 3 ++-
+ kernel/sched/fair.c | 17 ++++++++++++-----
+ kernel/sched/sched.h | 3 ++-
+ 3 files changed, 16 insertions(+), 7 deletions(-)
+
+diff --git a/kernel/sched/core.c b/kernel/sched/core.c
+index 154fd68..e891e12 100644
+--- a/kernel/sched/core.c
++++ b/kernel/sched/core.c
+@@ -5707,7 +5707,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
+ printk(KERN_CONT " %*pbl",
+ cpumask_pr_args(sched_group_cpus(group)));
+ if (group->sgc->capacity != SCHED_CAPACITY_SCALE) {
+- printk(KERN_CONT " (cpu_capacity = %d)",
++ printk(KERN_CONT " (cpu_capacity = %lu)",
+ group->sgc->capacity);
+ }
+
+@@ -6184,6 +6184,7 @@ int group_balance_cpu(struct sched_group *sg)
+ * die on a /0 trap.
+ */
+ sg->sgc->capacity = SCHED_CAPACITY_SCALE * cpumask_weight(sg_span);
++ sg->sgc->min_capacity = SCHED_CAPACITY_SCALE;
+
+ /*
+ * Make sure the first group of this domain contains the
+diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
+index 1ad3706..faf8f18 100644
+--- a/kernel/sched/fair.c
++++ b/kernel/sched/fair.c
+@@ -6909,13 +6909,14 @@ static void update_cpu_capacity(struct sched_domain *sd, int cpu)
+
+ cpu_rq(cpu)->cpu_capacity = capacity;
+ sdg->sgc->capacity = capacity;
++ sdg->sgc->min_capacity = capacity;
+ }
+
+ void update_group_capacity(struct sched_domain *sd, int cpu)
+ {
+ struct sched_domain *child = sd->child;
+ struct sched_group *group, *sdg = sd->groups;
+- unsigned long capacity;
++ unsigned long capacity, min_capacity;
+ unsigned long interval;
+
+ interval = msecs_to_jiffies(sd->balance_interval);
+@@ -6928,6 +6929,7 @@ void update_group_capacity(struct sched_domain *sd, int cpu)
+ }
+
+ capacity = 0;
++ min_capacity = ULONG_MAX;
+
+ if (child->flags & SD_OVERLAP) {
+ /*
+@@ -6952,11 +6954,12 @@ void update_group_capacity(struct sched_domain *sd, int cpu)
+ */
+ if (unlikely(!rq->sd)) {
+ capacity += capacity_of(cpu);
+- continue;
++ } else {
++ sgc = rq->sd->groups->sgc;
++ capacity += sgc->capacity;
+ }
+
+- sgc = rq->sd->groups->sgc;
+- capacity += sgc->capacity;
++ min_capacity = min(capacity, min_capacity);
+ }
+ } else {
+ /*
+@@ -6966,12 +6969,16 @@ void update_group_capacity(struct sched_domain *sd, int cpu)
+
+ group = child->groups;
+ do {
+- capacity += group->sgc->capacity;
++ struct sched_group_capacity *sgc = group->sgc;
++
++ capacity += sgc->capacity;
++ min_capacity = min(sgc->min_capacity, min_capacity);
+ group = group->next;
+ } while (group != child->groups);
+ }
+
+ sdg->sgc->capacity = capacity;
++ sdg->sgc->min_capacity = min_capacity;
+ }
+
+ /*
+diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
+index 055f935..345c1cc 100644
+--- a/kernel/sched/sched.h
++++ b/kernel/sched/sched.h
+@@ -892,7 +892,8 @@ struct sched_group_capacity {
+ * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity
+ * for a single CPU.
+ */
+- unsigned int capacity;
++ unsigned long capacity;
++ unsigned long min_capacity; /* Min per-CPU capacity in group */
+ unsigned long next_update;
+ int imbalance; /* XXX unrelated to capacity but shared group state */
+
+--
+1.9.1
+