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sched/fair: Enable tuning of decay period

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Thermal pressure follows pelt signals which means the decay period for
thermal pressure is the default pelt decay period. Depending on SoC
characteristics and thermal activity, it might be beneficial to decay
thermal pressure slower, but still in-tune with the pelt signals.  One way
to achieve this is to provide a command line parameter to set a decay
shift parameter to an integer between 0 and 10.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200222005213.3873-10-thara.gopinath@linaro.org
This commit is contained in:
Thara Gopinath
2020-02-21 19:52:13 -05:00
committed by Ingo Molnar
parent f12e4f66ab
commit 05289b90c2
4 changed files with 49 additions and 2 deletions
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15
kernel/sched/fair.c
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@@ -86,6 +86,19 @@ static unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL;
const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
int sched_thermal_decay_shift;
static int __init setup_sched_thermal_decay_shift(char *str)
{
int _shift = 0;
if (kstrtoint(str, 0, &_shift))
pr_warn("Unable to set scheduler thermal pressure decay shift parameter\n");
sched_thermal_decay_shift = clamp(_shift, 0, 10);
return 1;
}
__setup("sched_thermal_decay_shift=", setup_sched_thermal_decay_shift);
#ifdef CONFIG_SMP
/*
* For asym packing, by default the lower numbered CPU has higher priority.
@@ -7760,7 +7773,7 @@ static bool __update_blocked_others(struct rq *rq, bool *done)
decayed = update_rt_rq_load_avg(now, rq, curr_class == &rt_sched_class) |
update_dl_rq_load_avg(now, rq, curr_class == &dl_sched_class) |
update_thermal_load_avg(rq_clock_task(rq), rq, thermal_pressure) |
update_thermal_load_avg(rq_clock_thermal(rq), rq, thermal_pressure) |
update_irq_load_avg(rq, 0);
if (others_have_blocked(rq))