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Add the hw.ncpu tunable to arm64.

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This allows us to limit the number of CPUs to use, e.g. to debug problems
seen when enabling multiple clusters.

Reviewed by:	manu
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D19404
This commit is contained in:
andrew 2019-02-28 14:40:43 +00:00
parent 286aa3bdb8
commit 21d07a1dd3
1 changed files with 11 additions and 8 deletions
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19
sys/arm64/arm64/mp_machdep.c
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@ -638,9 +638,10 @@ cpu_find_cpu0_fdt(u_int id, phandle_t node, u_int addr_size, pcell_t *reg)
void
cpu_mp_setmaxid(void)
{
#if defined(DEV_ACPI) || defined(FDT)
int cores;
#endif
mp_ncpus = 1;
mp_maxid = 0;
switch(arm64_bus_method) {
#ifdef DEV_ACPI
@ -653,7 +654,6 @@ cpu_mp_setmaxid(void)
cores);
mp_ncpus = cores;
mp_maxid = cores - 1;
return;
}
break;
#endif
@ -667,18 +667,21 @@ cpu_mp_setmaxid(void)
cores);
mp_ncpus = cores;
mp_maxid = cores - 1;
return;
}
break;
#endif
default:
if (bootverbose)
printf("No CPU data, limiting to 1 core\n");
break;
}
if (bootverbose)
printf("No CPU data, limiting to 1 core\n");
mp_ncpus = 1;
mp_maxid = 0;
if (TUNABLE_INT_FETCH("hw.ncpu", &cores)) {
if (cores > 0 && cores < mp_ncpus) {
mp_ncpus = cores;
mp_maxid = cores - 1;
}
}
}
/*