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smp_topo: dynamically allocate group array

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Limit its size to mp_maxid + 1 times MAX_CACHE_LEVELS instead MAXCPU.
Allocate the array on a first call into smp_topo(9) functions, where
the mp_maxid is already known.

Make the array private to smp_topo_alloc(), assuming that the callers
that allocate top-level group do it once.

Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D39981
This commit is contained in:
Konstantin Belousov 2023-05-05 23:24:22 +03:00
parent ccc6b87b38
commit 9801e7c275
1 changed files with 10 additions and 7 deletions
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17
sys/kern/subr_smp.c
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@ -630,8 +630,6 @@ smp_rendezvous(void (* setup_func)(void *),
smp_rendezvous_cpus(all_cpus, setup_func, action_func, teardown_func, arg);
}
static struct cpu_group group[MAXCPU * MAX_CACHE_LEVELS + 1];
static void
smp_topo_fill(struct cpu_group *cg)
{
@ -713,9 +711,14 @@ smp_topo(void)
struct cpu_group *
smp_topo_alloc(u_int count)
{
static struct cpu_group *group = NULL;
static u_int index;
u_int curr;
if (group == NULL) {
group = mallocarray((mp_maxid + 1) * MAX_CACHE_LEVELS + 1,
sizeof(*group), M_DEVBUF, M_WAITOK | M_ZERO);
}
curr = index;
index += count;
return (&group[curr]);
@ -726,7 +729,7 @@ smp_topo_none(void)
{
struct cpu_group *top;
top = &group[0];
top = smp_topo_alloc(1);
top->cg_parent = NULL;
top->cg_child = NULL;
top->cg_mask = all_cpus;
@ -780,9 +783,9 @@ smp_topo_1level(int share, int count, int flags)
int i;
cpu = 0;
top = &group[0];
top = smp_topo_alloc(1);
packages = mp_ncpus / count;
top->cg_child = child = &group[1];
top->cg_child = child = top + 1;
top->cg_level = CG_SHARE_NONE;
for (i = 0; i < packages; i++, child++)
cpu = smp_topo_addleaf(top, child, share, count, flags, cpu);
@ -801,8 +804,8 @@ smp_topo_2level(int l2share, int l2count, int l1share, int l1count,
int j;
cpu = 0;
top = &group[0];
l2g = &group[1];
top = smp_topo_alloc(1);
l2g = top + 1;
top->cg_child = l2g;
top->cg_level = CG_SHARE_NONE;
top->cg_children = mp_ncpus / (l2count * l1count);