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| author | Alexander Motin <mav@FreeBSD.org> | 2021-08-02 14:50:34 +0000 |
|---|---|---|
| committer | Alexander Motin <mav@FreeBSD.org> | 2021-08-02 14:55:28 +0000 |
| commit | ca34553b6f631ec4ec5ae9f3825e3196e172c35d (patch) | |
| tree | 1b27d5f3ad19f9c66b65af9ffba96098994f38cb /sys/kern/sched_ule.c | |
| parent | 5c9cb96a239cd9793a74ff91baa7296b814948aa (diff) | |
| download | src-ca34553b6f631ec4ec5ae9f3825e3196e172c35d.tar.gz src-ca34553b6f631ec4ec5ae9f3825e3196e172c35d.zip | |
sched_ule(4): Pre-seed sched_random().
I don't think it changes anything, but why not.
While there, make cpu_search_highest() use all 8 lower load bits for
noise, since it does not use cs_prefer and the code is not shared
with cpu_search_lowest() any more.
MFC after: 1 month
Diffstat (limited to 'sys/kern/sched_ule.c')
| -rw-r--r-- | sys/kern/sched_ule.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/kern/sched_ule.c b/sys/kern/sched_ule.c index 1bdcfb1f793d..9bcc2a64e2b8 100644 --- a/sys/kern/sched_ule.c +++ b/sys/kern/sched_ule.c @@ -739,7 +739,7 @@ cpu_search_highest(const struct cpu_group *cg, const struct cpu_search *s, if (l < s->cs_limit || !tdq->tdq_transferable || !CPU_ISSET(c, s->cs_mask)) continue; - load -= sched_random() % 128; + load -= sched_random() % 256; if (load > bload) { bload = load; r->cs_cpu = c; @@ -1416,6 +1416,7 @@ sched_setup_smp(void) tdq->tdq_cg = smp_topo_find(cpu_top, i); if (tdq->tdq_cg == NULL) panic("Can't find cpu group for %d\n", i); + DPCPU_ID_SET(i, randomval, i * 69069 + 5); } PCPU_SET(sched, DPCPU_PTR(tdq)); balance_tdq = TDQ_SELF(); |