evie/android_kernel_oneplus_msm8998
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sched: Account for cpu's current frequency when calculating its power cost

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In estimating cost of running a task on a given cpu, cost of cpu at
its current frequency needs to over-ride cost at frequency demanded by
task, where cur_freq exceeds required frequency of task. This is
because placing a task on a cpu can only result in an increase of
cpu's frequency.

Change-Id: I021a3bbaf179bf1ec2c7f4556870256936797eb9
Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
This commit is contained in:
Srivatsa Vaddagiri 2014-06-10 17:03:43 -07:00 • committed by David Keitel
parent 3f2beb24f2
commit 9b71fb7cbb
1 changed files with 3 additions and 0 deletions
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3
kernel/sched/fair.c
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@ -2840,6 +2840,7 @@ unsigned int power_cost_at_freq(int cpu, unsigned int freq)
static unsigned int power_cost(struct task_struct *p, int cpu) static unsigned int power_cost(struct task_struct *p, int cpu)
{ {
unsigned int demand; unsigned int demand;
unsigned int cur_freq = cpu_rq(cpu)->cur_freq;
if (!sysctl_sched_enable_power_aware || sched_use_pelt) if (!sysctl_sched_enable_power_aware || sched_use_pelt)
return cpu_rq(cpu)->capacity; return cpu_rq(cpu)->capacity;
@ -2851,6 +2852,8 @@ static unsigned int power_cost(struct task_struct *p, int cpu)
demand *= cpu_rq(cpu)->max_possible_freq; demand *= cpu_rq(cpu)->max_possible_freq;
demand /= 100; /* khz needed */ demand /= 100; /* khz needed */
demand = max(cur_freq, demand);
return power_cost_at_freq(cpu, demand); return power_cost_at_freq(cpu, demand);
} }