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sched: Fix negative capacity issue under thermal conditions

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Currently, there is a issue in the system where the rt capacity could be
greater than the thermal capacity, and as a consequence we could end up
with a negative capacity in calculations.

Change-Id: If81be87878ae7948b0278e30ac4a8618d434d070
Signed-off-by: Shaleen Agrawal <quic_shalagra@quicinc.com>
This commit is contained in:
Shaleen Agrawal 2022-02-02 11:54:47 -08:00 committed by Rishabh Bhatnagar
parent 31f357a500
commit 3eeb00d318
1 changed files with 10 additions and 9 deletions
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19
kernel/sched/walt/walt.c
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@ -3821,31 +3821,32 @@ static void walt_cpu_frequency_limits(void *unused, struct cpufreq_policy *polic
*/
static void android_rvh_update_cpu_capacity(void *unused, int cpu, unsigned long *capacity)
{
unsigned long max_capacity = arch_scale_cpu_capacity(cpu);
unsigned long fmax_capacity = arch_scale_cpu_capacity(cpu);
unsigned long thermal_pressure = arch_scale_thermal_pressure(cpu);
unsigned long thermal_cap;
struct walt_sched_cluster *cluster;
unsigned long rt_pressure = max_capacity - *capacity;
unsigned long rt_pressure = fmax_capacity - *capacity;
struct rq *rq = cpu_rq(cpu);
if (unlikely(walt_disabled))
return;
/*
* thermal_pressure = max_capacity - curr_cap_as_per_thermal.
* thermal_pressure = cpu_scale - curr_cap_as_per_thermal.
* so,
* curr_cap_as_per_thermal = max_capacity - thermal_pressure.
* curr_cap_as_per_thermal = cpu_scale - thermal_pressure.
*/
thermal_cap = max_capacity - thermal_pressure;
thermal_cap = fmax_capacity - thermal_pressure;
cluster = cpu_cluster(cpu);
/* reduce the max_capacity under cpufreq constraints */
/* reduce the fmax_capacity under cpufreq constraints */
if (cluster->max_freq != cluster->max_possible_freq)
max_capacity = mult_frac(max_capacity, cluster->max_freq,
fmax_capacity = mult_frac(fmax_capacity, cluster->max_freq,
cluster->max_possible_freq);
cpu_rq(cpu)->cpu_capacity_orig = min(max_capacity, thermal_cap);
*capacity = cpu_rq(cpu)->cpu_capacity_orig - rt_pressure;
rq->cpu_capacity_orig = min(fmax_capacity, thermal_cap);
*capacity = max(rq->cpu_capacity_orig - rt_pressure, 1UL);
}
static void android_rvh_sched_cpu_starting(void *unused, int cpu)