tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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s390/hiperdispatch: Decrease steal time threshold

Higher steal time thresholds favor low utilization scenarios, which is not
the common case for s390. Set steal time threshold to a lower value to
prioritize vertical high and medium CPUs sooner and allow high utilization
scenarios to benefit from it.

Suggested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Mete Durlu <meted@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

authored by

Mete Durlu and committed by
Heiko Carstens 8840cc45 eb3a9b40

+1 -1
+1 -1
arch/s390/kernel/hiperdispatch.c
··· 65 65 66 66 #define HD_DELAY_FACTOR (4) 67 67 #define HD_DELAY_INTERVAL (HZ / 4) 68 - #define HD_STEAL_THRESHOLD 30 68 + #define HD_STEAL_THRESHOLD 10 69 69 #define HD_STEAL_AVG_WEIGHT 16 70 70 71 71 static cpumask_t hd_vl_coremask; /* Mask containing all vertical low COREs */