git: acbd8022ae23 - stable/13 - cpuset(9): Add CPU_FOREACH_IS(SET|CLR) and modify consumers to use it
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Date: Mon, 01 Nov 2021 13:23:12 UTC
The branch stable/13 has been updated by markj:
URL: https://cgit.FreeBSD.org/src/commit/?id=acbd8022ae23b7ec1a2179877c4e54ce40919309
commit acbd8022ae23b7ec1a2179877c4e54ce40919309
Author: Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2021-09-21 15:36:55 +0000
Commit: Mark Johnston <markj@FreeBSD.org>
CommitDate: 2021-11-01 13:20:11 +0000
cpuset(9): Add CPU_FOREACH_IS(SET|CLR) and modify consumers to use it
This implementation is faster and doesn't modify the cpuset, so it lets
us avoid some unnecessary copying as well. No functional change
intended.
This is a re-application of commit
9068f6ea697b1b28ad1326a4c7a9ba86f08b985e.
Reviewed by: cem, kib, jhb
Sponsored by: The FreeBSD Foundation
(cherry picked from commit de8554295b47475e758a573ab7418265f21fee7e)
---
sys/amd64/amd64/mp_machdep.c | 11 +++--------
sys/amd64/vmm/io/vlapic.c | 13 +++----------
sys/amd64/vmm/vmm_lapic.c | 4 +---
sys/i386/i386/mp_machdep.c | 4 +---
sys/sys/cpuset.h | 2 ++
sys/x86/x86/mp_x86.c | 4 +---
6 files changed, 11 insertions(+), 27 deletions(-)
diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c
index 383226b96d10..14853ce56603 100644
--- a/sys/amd64/amd64/mp_machdep.c
+++ b/sys/amd64/amd64/mp_machdep.c
@@ -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();
diff --git a/sys/amd64/vmm/io/vlapic.c b/sys/amd64/vmm/io/vlapic.c
index 06df1c1a87e5..4e7ddbafd447 100644
--- a/sys/amd64/vmm/io/vlapic.c
+++ b/sys/amd64/vmm/io/vlapic.c
@@ -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 {
diff --git a/sys/amd64/vmm/vmm_lapic.c b/sys/amd64/vmm/vmm_lapic.c
index 89a1ebc8eff9..8191da758100 100644
--- a/sys/amd64/vmm/vmm_lapic.c
+++ b/sys/amd64/vmm/vmm_lapic.c
@@ -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)
diff --git a/sys/i386/i386/mp_machdep.c b/sys/i386/i386/mp_machdep.c
index 156702118c45..777aefa021b3 100644
--- a/sys/i386/i386/mp_machdep.c
+++ b/sys/i386/i386/mp_machdep.c
@@ -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();
diff --git a/sys/sys/cpuset.h b/sys/sys/cpuset.h
index 1a96bb4766ce..9ef1a65f4506 100644
--- a/sys/sys/cpuset.h
+++ b/sys/sys/cpuset.h
@@ -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
diff --git a/sys/x86/x86/mp_x86.c b/sys/x86/x86/mp_x86.c
index 326b6fdae77d..255a6c13f025 100644
--- a/sys/x86/x86/mp_x86.c
+++ b/sys/x86/x86/mp_x86.c
@@ -1343,9 +1343,7 @@ 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);
}