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kernel: sched: Provide more PELT half-life options

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- Regenerate `kernel/sched/sched-pelt.h` by `Documentation/scheduler/sched-pelt`.
- Now we can choose from 32ms (default), 16ms, 12ms, 8ms.
This commit is contained in:
Pzqqt 2024-02-17 23:02:23 +08:00 • committed by Ksawlii
parent 648fb626ad
commit 3de61e729d
3 changed files with 40 additions and 9 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
View file

@ -3723,6 +3723,8 @@
pelt= [KNL] Boot-time parameter changing the PELT half life in ms pelt= [KNL] Boot-time parameter changing the PELT half life in ms
Format: <int> Format: <int>
32: Set the half life to 32ms 32: Set the half life to 32ms
16: Set the half life to 16ms
12: Set the half life to 12ms
8: Set the half life to 8ms 8: Set the half life to 8ms
default: 32 default: 32

12
kernel/sched/pelt.c
View file

@ -64,6 +64,18 @@ static int __set_pelt_halflife(void *data)
pelt_runnable_avg_yN_inv = pelt8_runnable_avg_yN_inv; pelt_runnable_avg_yN_inv = pelt8_runnable_avg_yN_inv;
pr_info("PELT half life is set to %dms\n", num); pr_info("PELT half life is set to %dms\n", num);
break; break;
case PELT12_LOAD_AVG_PERIOD:
pelt_load_avg_period = PELT12_LOAD_AVG_PERIOD;
pelt_load_avg_max = PELT12_LOAD_AVG_MAX;
pelt_runnable_avg_yN_inv = pelt12_runnable_avg_yN_inv;
pr_info("PELT half life is set to %dms\n", num);
break;
case PELT16_LOAD_AVG_PERIOD:
pelt_load_avg_period = PELT16_LOAD_AVG_PERIOD;
pelt_load_avg_max = PELT16_LOAD_AVG_MAX;
pelt_runnable_avg_yN_inv = pelt16_runnable_avg_yN_inv;
pr_info("PELT half life is set to %dms\n", num);
break;
case PELT32_LOAD_AVG_PERIOD: case PELT32_LOAD_AVG_PERIOD:
pelt_load_avg_period = PELT32_LOAD_AVG_PERIOD; pelt_load_avg_period = PELT32_LOAD_AVG_PERIOD;
pelt_load_avg_max = PELT32_LOAD_AVG_MAX; pelt_load_avg_max = PELT32_LOAD_AVG_MAX;

23
kernel/sched/sched-pelt.h
View file

@ -13,13 +13,30 @@ static const u32 pelt32_runnable_avg_yN_inv[] __maybe_unused = {
#define PELT32_LOAD_AVG_PERIOD 32 #define PELT32_LOAD_AVG_PERIOD 32
#define PELT32_LOAD_AVG_MAX 47742 #define PELT32_LOAD_AVG_MAX 47742
static const u32 pelt16_runnable_avg_yN_inv[] __maybe_unused = {
0xffffffff, 0xf5257d14, 0xeac0c6e6, 0xe0ccdeeb, 0xd744fcc9, 0xce248c14,
0xc5672a10, 0xbd08a39e, 0xb504f333, 0xad583ee9, 0xa5fed6a9, 0x9ef5325f,
0x9837f050, 0x91c3d373, 0x8b95c1e3, 0x85aac367,
};
#define PELT16_LOAD_AVG_PERIOD 16
#define PELT16_LOAD_AVG_MAX 24130
static const u32 pelt12_runnable_avg_yN_inv[] __maybe_unused = {
0xffffffff, 0xf1a1bf37, 0xe411f039, 0xd744fcc9, 0xcb2ff529, 0xbfc886ba,
0xb504f333, 0xaadc0846, 0xa14517cb, 0x9837f050, 0x8facd61d, 0x879c7c96,
};
#define PELT12_LOAD_AVG_PERIOD 12
#define PELT12_LOAD_AVG_MAX 18227
static const u32 pelt8_runnable_avg_yN_inv[] __maybe_unused = { static const u32 pelt8_runnable_avg_yN_inv[] __maybe_unused = {
0xffffffff, 0xeac0c6e6, 0xd744fcc9, 0xc5672a10, 0xffffffff, 0xeac0c6e6, 0xd744fcc9, 0xc5672a10, 0xb504f333, 0xa5fed6a9,
0xb504f333, 0xa5fed6a9, 0x9837f050, 0x8b95c1e3, 0x9837f050, 0x8b95c1e3,
}; };
#define PELT8_LOAD_AVG_PERIOD 8 #define PELT8_LOAD_AVG_PERIOD 8
#define PELT8_LOAD_AVG_MAX 12336 #define PELT8_LOAD_AVG_MAX 12326
extern const u32 *pelt_runnable_avg_yN_inv; extern const u32 *pelt_runnable_avg_yN_inv;
extern int pelt_load_avg_period; extern int pelt_load_avg_period;