diff options
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.patch | 107 |
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 + |