TBT: EXPERIMENTAL: sched/fair: recalculate PELT lookup tables for 16ms
Mobile workloads might see benefits having a PELT half-life timespan
of 16ms.
Recalculate lookup tables for such a value.
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 814f2b7..a3fd99c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -672,9 +672,9 @@
* We choose a half-life close to 1 scheduling period.
* Note: The tables below are dependent on this value.
*/
-#define LOAD_AVG_PERIOD 32
-#define LOAD_AVG_MAX 47742 /* maximum possible load avg */
-#define LOAD_AVG_MAX_N 345 /* number of full periods to produce LOAD_MAX_AVG */
+#define LOAD_AVG_PERIOD 16
+#define LOAD_AVG_MAX 24117 /* maximum possible load avg */
+#define LOAD_AVG_MAX_N 172 /* number of full periods to produce LOAD_AVG_MAX */
/* Give new sched_entity start runnable values to heavy its load in infant time */
void init_entity_runnable_average(struct sched_entity *se)
@@ -2217,12 +2217,8 @@
#ifdef CONFIG_SMP
/* Precomputed fixed inverse multiplies for multiplication by y^n */
static const u32 runnable_avg_yN_inv[] = {
- 0xffffffff, 0xfa83b2da, 0xf5257d14, 0xefe4b99a, 0xeac0c6e6, 0xe5b906e6,
- 0xe0ccdeeb, 0xdbfbb796, 0xd744fcc9, 0xd2a81d91, 0xce248c14, 0xc9b9bd85,
- 0xc5672a10, 0xc12c4cc9, 0xbd08a39e, 0xb8fbaf46, 0xb504f333, 0xb123f581,
- 0xad583ee9, 0xa9a15ab4, 0xa5fed6a9, 0xa2704302, 0x9ef5325f, 0x9b8d39b9,
- 0x9837f050, 0x94f4efa8, 0x91c3d373, 0x8ea4398a, 0x8b95c1e3, 0x88980e80,
- 0x85aac367, 0x82cd8698,
+ 0xffff, 0xf524, 0xeabf, 0xe0cb, 0xd744, 0xce23, 0xc566, 0xbd07,
+ 0xb504, 0xad57, 0xa5fe, 0x9ef4, 0x9837, 0x91c3, 0x8b95, 0x85aa,
};
/*
@@ -2230,9 +2226,8 @@
* over-estimates when re-combining.
*/
static const u32 runnable_avg_yN_sum[] = {
- 0, 1002, 1982, 2941, 3880, 4798, 5697, 6576, 7437, 8279, 9103,
- 9909,10698,11470,12226,12966,13690,14398,15091,15769,16433,17082,
- 17718,18340,18949,19545,20128,20698,21256,21802,22336,22859,23371,
+ 0, 980, 1919, 2818, 3679, 4503, 5292, 6048, 6772, 7465, 8129,
+ 8764, 9373, 9956,10514,11048,11560,
};
/*
@@ -2263,7 +2258,8 @@
local_n %= LOAD_AVG_PERIOD;
}
- val = mul_u64_u32_shr(val, runnable_avg_yN_inv[local_n], 32);
+ val = mul_u64_u32_shr(val, runnable_avg_yN_inv[local_n],
+ LOAD_AVG_PERIOD);
return val;
}
