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Diffstat (limited to 'meta-eas/recipes-kernel/linux/linux-renesas/0055-sched-Estimate-energy-impact-of-scheduling-decisions.patch')
| -rw-r--r-- | meta-eas/recipes-kernel/linux/linux-renesas/0055-sched-Estimate-energy-impact-of-scheduling-decisions.patch | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/meta-eas/recipes-kernel/linux/linux-renesas/0055-sched-Estimate-energy-impact-of-scheduling-decisions.patch b/meta-eas/recipes-kernel/linux/linux-renesas/0055-sched-Estimate-energy-impact-of-scheduling-decisions.patch new file mode 100644 index 0000000..f6fc44d --- /dev/null +++ b/meta-eas/recipes-kernel/linux/linux-renesas/0055-sched-Estimate-energy-impact-of-scheduling-decisions.patch @@ -0,0 +1,84 @@ +From 9994534fcf8c013f6dfbb017055a3be2c8f48a0f Mon Sep 17 00:00:00 2001 +From: Morten Rasmussen <morten.rasmussen@arm.com> +Date: Tue, 6 Jan 2015 17:34:05 +0000 +Subject: [PATCH 55/92] sched: Estimate energy impact of scheduling decisions + +Adds a generic energy-aware helper function, energy_diff(), that +calculates energy impact of adding, removing, and migrating utilization +in the system. + +cc: Ingo Molnar <mingo@redhat.com> +cc: Peter Zijlstra <peterz@infradead.org> +Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com> +(cherry picked from commit 6f19a2b0b118f6551e22cf21c1230040a3c4f8a1) +Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com> +--- + kernel/sched/fair.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ + 1 file changed, 52 insertions(+) + +diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c +index dcc73d8..dc1fca0 100644 +--- a/kernel/sched/fair.c ++++ b/kernel/sched/fair.c +@@ -5522,6 +5522,58 @@ static int sched_group_energy(struct energy_env *eenv) + return 0; + } + ++static inline bool cpu_in_sg(struct sched_group *sg, int cpu) ++{ ++ return cpu != -1 && cpumask_test_cpu(cpu, sched_group_cpus(sg)); ++} ++ ++/* ++ * energy_diff(): Estimate the energy impact of changing the utilization ++ * distribution. eenv specifies the change: utilisation amount, source, and ++ * destination cpu. Source or destination cpu may be -1 in which case the ++ * utilization is removed from or added to the system (e.g. task wake-up). If ++ * both are specified, the utilization is migrated. ++ */ ++static int energy_diff(struct energy_env *eenv) ++{ ++ struct sched_domain *sd; ++ struct sched_group *sg; ++ int sd_cpu = -1, energy_before = 0, energy_after = 0; ++ ++ struct energy_env eenv_before = { ++ .util_delta = 0, ++ .src_cpu = eenv->src_cpu, ++ .dst_cpu = eenv->dst_cpu, ++ }; ++ ++ if (eenv->src_cpu == eenv->dst_cpu) ++ return 0; ++ ++ sd_cpu = (eenv->src_cpu != -1) ? eenv->src_cpu : eenv->dst_cpu; ++ sd = rcu_dereference(per_cpu(sd_ea, sd_cpu)); ++ ++ if (!sd) ++ return 0; /* Error */ ++ ++ sg = sd->groups; ++ ++ do { ++ if (cpu_in_sg(sg, eenv->src_cpu) || cpu_in_sg(sg, eenv->dst_cpu)) { ++ eenv_before.sg_top = eenv->sg_top = sg; ++ ++ if (sched_group_energy(&eenv_before)) ++ return 0; /* Invalid result abort */ ++ energy_before += eenv_before.energy; ++ ++ if (sched_group_energy(eenv)) ++ return 0; /* Invalid result abort */ ++ energy_after += eenv->energy; ++ } ++ } while (sg = sg->next, sg != sd->groups); ++ ++ return energy_after-energy_before; ++} ++ + /* + * Detect M:N waker/wakee relationships via a switching-frequency heuristic. + * +-- +1.9.1 + |