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sched: Determine the current sched_group idle-state

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To estimate the energy consumption of a sched_group in
sched_group_energy() it is necessary to know which idle-state the group
is in when it is idle. For now, it is assumed that this is the current
idle-state (though it might be wrong). Based on the individual cpu
idle-states group_idle_state() finds the group idle-state.

cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
This commit is contained in:
Dietmar Eggemann 2015-01-27 14:04:17 +00:00 • committed by Leo Yan
parent 19a5ebe13d
commit ec055b978e
1 changed files with 21 additions and 4 deletions
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21
kernel/sched/fair.c
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@ -4815,6 +4815,20 @@ static int find_new_capacity(struct energy_env *eenv,
return idx; return idx;
} }
static int group_idle_state(struct sched_group *sg)
{
int i, state = INT_MAX;
/* Find the shallowest idle state in the sched group. */
for_each_cpu(i, sched_group_cpus(sg))
state = min(state, idle_get_state_idx(cpu_rq(i)));
/* Take non-cpuidle idling into account (active idle/arch_cpu_idle()) */
state++;
return state;
}
/* /*
* sched_group_energy(): Computes the absolute energy consumption of cpus * sched_group_energy(): Computes the absolute energy consumption of cpus
* belonging to the sched_group including shared resources shared only by * belonging to the sched_group including shared resources shared only by
@ -4867,7 +4881,8 @@ static int sched_group_energy(struct energy_env *eenv)
do { do {
unsigned long group_util; unsigned long group_util;
int sg_busy_energy, sg_idle_energy, cap_idx; int sg_busy_energy, sg_idle_energy;
int cap_idx, idle_idx;
if (sg_shared_cap && sg_shared_cap->group_weight >= sg->group_weight) if (sg_shared_cap && sg_shared_cap->group_weight >= sg->group_weight)
eenv->sg_cap = sg_shared_cap; eenv->sg_cap = sg_shared_cap;
@ -4875,10 +4890,12 @@ static int sched_group_energy(struct energy_env *eenv)
eenv->sg_cap = sg; eenv->sg_cap = sg;
cap_idx = find_new_capacity(eenv, sg->sge); cap_idx = find_new_capacity(eenv, sg->sge);
idle_idx = group_idle_state(sg);
group_util = group_norm_util(eenv, sg); group_util = group_norm_util(eenv, sg);
sg_busy_energy = (group_util * sg->sge->cap_states[cap_idx].power) sg_busy_energy = (group_util * sg->sge->cap_states[cap_idx].power)
>> SCHED_CAPACITY_SHIFT; >> SCHED_CAPACITY_SHIFT;
sg_idle_energy = ((SCHED_LOAD_SCALE-group_util) * sg->sge->idle_states[0].power) sg_idle_energy = ((SCHED_LOAD_SCALE-group_util)
* sg->sge->idle_states[idle_idx].power)
>> SCHED_CAPACITY_SHIFT; >> SCHED_CAPACITY_SHIFT;
total_energy += sg_busy_energy + sg_idle_energy; total_energy += sg_busy_energy + sg_idle_energy;