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ANDROID: sched: add a helper function to change PELT half-life

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Add a new helper function and export it for vendor module to
dynamically switch to an alternative half-life at runtime.

Bug: 195474490
Signed-off-by: JianMin Liu <jian-min.liu@mediatek.com>
Change-Id: Ife41997a032fe3384cfa126cbf7aee929c5c11cf
This commit is contained in:
JianMin Liu
2021-08-04 11:52:40 +08:00
parent bda49ad060
commit 1efc36b815
1 changed files with 32 additions and 9 deletions
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41
kernel/sched/pelt.c
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@@ -32,15 +32,16 @@ int pelt_load_avg_period = PELT32_LOAD_AVG_PERIOD;
int pelt_load_avg_max = PELT32_LOAD_AVG_MAX;
const u32 *pelt_runnable_avg_yN_inv = pelt32_runnable_avg_yN_inv;
static int __init set_pelt(char *str)
int get_pelt_halflife(void)
{
int rc, num;
return pelt_load_avg_period;
}
EXPORT_SYMBOL_GPL(get_pelt_halflife);
rc = kstrtoint(str, 0, &num);
if (rc) {
pr_err("%s: kstrtoint failed. rc=%d\n", __func__, rc);
return 0;
}
static int __set_pelt_halflife(void *data)
{
int rc = 0;
int num = *(int *)data;
switch (num) {
case PELT8_LOAD_AVG_PERIOD:
@@ -56,10 +57,32 @@ static int __init set_pelt(char *str)
pr_info("PELT half life is set to %dms\n", num);
break;
default:
pr_err("Default PELT half life is 32ms\n");
rc = -EINVAL;
pr_err("Failed to set PELT half life to %dms, the current value is %dms\n",
num, pelt_load_avg_period);
}
return 0;
return rc;
}
int set_pelt_halflife(int num)
{
return stop_machine(__set_pelt_halflife, &num, NULL);
}
EXPORT_SYMBOL_GPL(set_pelt_halflife);
static int __init set_pelt(char *str)
{
int rc, num;
rc = kstrtoint(str, 0, &num);
if (rc) {
pr_err("%s: kstrtoint failed. rc=%d\n", __func__, rc);
return 0;
}
__set_pelt_halflife(&num);
return rc;
}
early_param("pelt", set_pelt);