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cpuset(9): Add CPU_FOREACH_IS(SET|CLR) and modify consumers to use it

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This implementation is faster and doesn't modify the cpuset, so it lets
us avoid some unnecessary copying as well.  No functional change
intended.

Reviewed by:	cem, kib, jhb
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32029
This commit is contained in:
Mark Johnston 2021-09-21 11:36:55 -04:00
parent dfd3bde577
commit 9068f6ea69
6 changed files with 11 additions and 27 deletions
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11
sys/amd64/amd64/mp_machdep.c
View File

@ -618,7 +618,7 @@ static void
smp_targeted_tlb_shootdown(cpuset_t mask, pmap_t pmap, vm_offset_t addr1,
vm_offset_t addr2, smp_invl_cb_t curcpu_cb, enum invl_op_codes op)
{
cpuset_t other_cpus, mask1;
cpuset_t other_cpus;
uint32_t generation, *p_cpudone;
int cpu;
bool is_all;
@ -662,10 +662,7 @@ smp_targeted_tlb_shootdown(cpuset_t mask, pmap_t pmap, vm_offset_t addr1,
/* Fence between filling smp_tlb fields and clearing scoreboard. */
atomic_thread_fence_rel();
mask1 = mask;
while ((cpu = CPU_FFS(&mask1)) != 0) {
cpu--;
CPU_CLR(cpu, &mask1);
CPU_FOREACH_ISSET(cpu, &mask) {
KASSERT(*invl_scoreboard_slot(cpu) != 0,
("IPI scoreboard is zero, initiator %d target %d",
PCPU_GET(cpuid), cpu));
@ -686,9 +683,7 @@ smp_targeted_tlb_shootdown(cpuset_t mask, pmap_t pmap, vm_offset_t addr1,
ipi_selected(mask, IPI_INVLOP);
}
curcpu_cb(pmap, addr1, addr2);
while ((cpu = CPU_FFS(&other_cpus)) != 0) {
cpu--;
CPU_CLR(cpu, &other_cpus);
CPU_FOREACH_ISSET(cpu, &other_cpus) {
p_cpudone = invl_scoreboard_slot(cpu);
while (atomic_load_int(p_cpudone) != generation)
ia32_pause();

13
sys/amd64/vmm/io/vlapic.c
View File

@ -860,10 +860,7 @@ vlapic_calcdest(struct vm *vm, cpuset_t *dmask, uint32_t dest, bool phys,
*/
CPU_ZERO(dmask);
amask = vm_active_cpus(vm);
while ((vcpuid = CPU_FFS(&amask)) != 0) {
vcpuid--;
CPU_CLR(vcpuid, &amask);
CPU_FOREACH_ISSET(vcpuid, &amask) {
vlapic = vm_lapic(vm, vcpuid);
dfr = vlapic->apic_page->dfr;
ldr = vlapic->apic_page->ldr;
@ -1003,9 +1000,7 @@ vlapic_icrlo_write_handler(struct vlapic *vlapic, bool *retu)
break;
}
while ((i = CPU_FFS(&dmask)) != 0) {
i--;
CPU_CLR(i, &dmask);
CPU_FOREACH_ISSET(i, &dmask) {
if (mode == APIC_DELMODE_FIXED) {
lapic_intr_edge(vlapic->vm, i, vec);
vmm_stat_array_incr(vlapic->vm, vlapic->vcpuid,
@ -1554,9 +1549,7 @@ vlapic_deliver_intr(struct vm *vm, bool level, uint32_t dest, bool phys,
*/
vlapic_calcdest(vm, &dmask, dest, phys, lowprio, false);
while ((vcpuid = CPU_FFS(&dmask)) != 0) {
vcpuid--;
CPU_CLR(vcpuid, &dmask);
CPU_FOREACH_ISSET(vcpuid, &dmask) {
if (delmode == IOART_DELEXINT) {
vm_inject_extint(vm, vcpuid);
} else {

4
sys/amd64/vmm/vmm_lapic.c
View File

@ -87,9 +87,7 @@ lapic_set_local_intr(struct vm *vm, int cpu, int vector)
else
CPU_SETOF(cpu, &dmask);
error = 0;
while ((cpu = CPU_FFS(&dmask)) != 0) {
cpu--;
CPU_CLR(cpu, &dmask);
CPU_FOREACH_ISSET(cpu, &dmask) {
vlapic = vm_lapic(vm, cpu);
error = vlapic_trigger_lvt(vlapic, vector);
if (error)

4
sys/i386/i386/mp_machdep.c
View File

@ -598,9 +598,7 @@ smp_targeted_tlb_shootdown(cpuset_t mask, u_int vector, pmap_t pmap,
ipi_selected(mask, vector);
}
curcpu_cb(pmap, addr1, addr2);
while ((cpu = CPU_FFS(&other_cpus)) != 0) {
cpu--;
CPU_CLR(cpu, &other_cpus);
CPU_FOREACH_ISSET(cpu, &other_cpus) {
p_cpudone = &cpuid_to_pcpu[cpu]->pc_smp_tlb_done;
while (*p_cpudone != generation)
ia32_pause();

2
sys/sys/cpuset.h
View File

@ -66,6 +66,8 @@
#define CPU_COPY_STORE_REL(f, t) BIT_COPY_STORE_REL(CPU_SETSIZE, f, t)
#define CPU_FFS(p) BIT_FFS(CPU_SETSIZE, p)
#define CPU_FLS(p) BIT_FLS(CPU_SETSIZE, p)
#define CPU_FOREACH_ISSET(i, p) BIT_FOREACH_ISSET(CPU_SETSIZE, i, p)
#define CPU_FOREACH_ISCLR(i, p) BIT_FOREACH_ISCLR(CPU_SETSIZE, i, p)
#define CPU_COUNT(p) ((int)BIT_COUNT(CPU_SETSIZE, p))
#define CPUSET_FSET BITSET_FSET(_NCPUWORDS)
#define CPUSET_T_INITIALIZER BITSET_T_INITIALIZER

4
sys/x86/x86/mp_x86.c
View File

@ -1290,9 +1290,7 @@ ipi_selected(cpuset_t cpus, u_int ipi)
if (ipi == IPI_STOP_HARD)
CPU_OR_ATOMIC(&ipi_stop_nmi_pending, &cpus);
while ((cpu = CPU_FFS(&cpus)) != 0) {
cpu--;
CPU_CLR(cpu, &cpus);
CPU_FOREACH_ISSET(cpu, &cpus) {
CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
ipi_send_cpu(cpu, ipi);
}