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

This commit is contained in:

Alexander Motin

2021-08-02 10:50:34 -04:00

parent 5c9cb96a23

commit ca34553b6f

1 changed files with 2 additions and 1 deletions

									
										sys/kern/sched_ule.c
									
		+2
		-1
	
												View File
												
				@@ -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();