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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/0047-sched-Introduce-energy-data-structures.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/0047-sched-Introduce-energy-data-structures.patch')
-rw-r--r--meta-eas/recipes-kernel/linux/linux-renesas/0047-sched-Introduce-energy-data-structures.patch107
1 files changed, 107 insertions, 0 deletions
diff --git a/meta-eas/recipes-kernel/linux/linux-renesas/0047-sched-Introduce-energy-data-structures.patch b/meta-eas/recipes-kernel/linux/linux-renesas/0047-sched-Introduce-energy-data-structures.patch
new file mode 100644
index 0000000..5590b2f
--- /dev/null
+++ b/meta-eas/recipes-kernel/linux/linux-renesas/0047-sched-Introduce-energy-data-structures.patch
@@ -0,0 +1,107 @@
+From 5e91e54c76b1a29dff30f8c5bfb7741569b3a6f8 Mon Sep 17 00:00:00 2001
+From: Dietmar Eggemann <dietmar.eggemann@arm.com>
+Date: Fri, 14 Nov 2014 16:08:45 +0000
+Subject: [PATCH 47/92] sched: Introduce energy data structures
+
+The struct sched_group_energy represents the per sched_group related
+data which is needed for energy aware scheduling. It contains:
+
+ (1) number of elements of the idle state array
+ (2) pointer to the idle state array which comprises 'power consumption'
+ for each idle state
+ (3) number of elements of the capacity state array
+ (4) pointer to the capacity state array which comprises 'compute
+ capacity and power consumption' tuples for each capacity state
+
+The struct sched_group obtains a pointer to a struct sched_group_energy.
+
+The function pointer sched_domain_energy_f is introduced into struct
+sched_domain_topology_level which will allow the arch to pass a particular
+struct sched_group_energy from the topology shim layer into the scheduler
+core.
+
+The function pointer sched_domain_energy_f has an 'int cpu' parameter
+since the folding of two adjacent sd levels via sd degenerate doesn't work
+for all sd levels. I.e. it is not possible for example to use this feature
+to provide per-cpu energy in sd level DIE on ARM's TC2 platform.
+
+It was discussed that the folding of sd levels approach is preferable
+over the cpu parameter approach, simply because the user (the arch
+specifying the sd topology table) can introduce less errors. But since
+it is not working, the 'int cpu' parameter is the only way out. It's
+possible to use the folding of sd levels approach for
+sched_domain_flags_f and the cpu parameter approach for the
+sched_domain_energy_f at the same time though. With the use of the
+'int cpu' parameter, an extra check function has to be provided to make
+sure that all cpus spanned by a sched group are provisioned with the same
+energy data.
+
+cc: Ingo Molnar <mingo@redhat.com>
+cc: Peter Zijlstra <peterz@infradead.org>
+Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
+(cherry picked from commit 0bab805ddc2bbf1dae5baf44f2812392789846c7)
+Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
+---
+ include/linux/sched.h | 19 +++++++++++++++++++
+ kernel/sched/sched.h | 1 +
+ 2 files changed, 20 insertions(+)
+
+diff --git a/include/linux/sched.h b/include/linux/sched.h
+index 2e3c2a1..0522149 100644
+--- a/include/linux/sched.h
++++ b/include/linux/sched.h
+@@ -1069,6 +1069,22 @@ struct sched_domain_attr {
+
+ extern int sched_domain_level_max;
+
++struct capacity_state {
++ unsigned long cap; /* compute capacity */
++ unsigned long power; /* power consumption at this compute capacity */
++};
++
++struct idle_state {
++ unsigned long power; /* power consumption in this idle state */
++};
++
++struct sched_group_energy {
++ unsigned int nr_idle_states; /* number of idle states */
++ struct idle_state *idle_states; /* ptr to idle state array */
++ unsigned int nr_cap_states; /* number of capacity states */
++ struct capacity_state *cap_states; /* ptr to capacity state array */
++};
++
+ struct sched_group;
+
+ struct sched_domain_shared {
+@@ -1176,6 +1192,8 @@ extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
+
+ typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
+ typedef int (*sched_domain_flags_f)(void);
++typedef
++const struct sched_group_energy * const(*sched_domain_energy_f)(int cpu);
+
+ #define SDTL_OVERLAP 0x01
+
+@@ -1189,6 +1207,7 @@ struct sd_data {
+ struct sched_domain_topology_level {
+ sched_domain_mask_f mask;
+ sched_domain_flags_f sd_flags;
++ sched_domain_energy_f energy;
+ int flags;
+ int numa_level;
+ struct sd_data data;
+diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
+index 7b34c78..46787bd 100644
+--- a/kernel/sched/sched.h
++++ b/kernel/sched/sched.h
+@@ -914,6 +914,7 @@ struct sched_group {
+ unsigned int group_weight;
+ struct sched_group_capacity *sgc;
+ int asym_prefer_cpu; /* cpu of highest priority in group */
++ const struct sched_group_energy const *sge;
+
+ /*
+ * The CPUs this group covers.
+--
+1.9.1
+