diff options
Diffstat (limited to 'accel/kvm/kvm-all.c')
| -rw-r--r-- | accel/kvm/kvm-all.c | 46 |
1 files changed, 36 insertions, 10 deletions
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 3a2677d065..99aede73b7 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -45,6 +45,7 @@ #include "qemu/guest-random.h" #include "sysemu/hw_accel.h" #include "kvm-cpus.h" +#include "sysemu/dirtylimit.h" #include "hw/boards.h" #include "monitor/stats.h" @@ -477,6 +478,7 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp) cpu->kvm_state = s; cpu->vcpu_dirty = true; cpu->dirty_pages = 0; + cpu->throttle_us_per_full = 0; mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); if (mmap_size < 0) { @@ -757,17 +759,20 @@ static uint32_t kvm_dirty_ring_reap_one(KVMState *s, CPUState *cpu) } /* Must be with slots_lock held */ -static uint64_t kvm_dirty_ring_reap_locked(KVMState *s) +static uint64_t kvm_dirty_ring_reap_locked(KVMState *s, CPUState* cpu) { int ret; - CPUState *cpu; uint64_t total = 0; int64_t stamp; stamp = get_clock(); - CPU_FOREACH(cpu) { - total += kvm_dirty_ring_reap_one(s, cpu); + if (cpu) { + total = kvm_dirty_ring_reap_one(s, cpu); + } else { + CPU_FOREACH(cpu) { + total += kvm_dirty_ring_reap_one(s, cpu); + } } if (total) { @@ -788,7 +793,7 @@ static uint64_t kvm_dirty_ring_reap_locked(KVMState *s) * Currently for simplicity, we must hold BQL before calling this. We can * consider to drop the BQL if we're clear with all the race conditions. */ -static uint64_t kvm_dirty_ring_reap(KVMState *s) +static uint64_t kvm_dirty_ring_reap(KVMState *s, CPUState *cpu) { uint64_t total; @@ -808,7 +813,7 @@ static uint64_t kvm_dirty_ring_reap(KVMState *s) * reset below. */ kvm_slots_lock(); - total = kvm_dirty_ring_reap_locked(s); + total = kvm_dirty_ring_reap_locked(s, cpu); kvm_slots_unlock(); return total; @@ -855,7 +860,7 @@ static void kvm_dirty_ring_flush(void) * vcpus out in a synchronous way. */ kvm_cpu_synchronize_kick_all(); - kvm_dirty_ring_reap(kvm_state); + kvm_dirty_ring_reap(kvm_state, NULL); trace_kvm_dirty_ring_flush(1); } @@ -1399,7 +1404,7 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml, * Not easy. Let's cross the fingers until it's fixed. */ if (kvm_state->kvm_dirty_ring_size) { - kvm_dirty_ring_reap_locked(kvm_state); + kvm_dirty_ring_reap_locked(kvm_state, NULL); } else { kvm_slot_get_dirty_log(kvm_state, mem); } @@ -1467,11 +1472,16 @@ static void *kvm_dirty_ring_reaper_thread(void *data) */ sleep(1); + /* keep sleeping so that dirtylimit not be interfered by reaper */ + if (dirtylimit_in_service()) { + continue; + } + trace_kvm_dirty_ring_reaper("wakeup"); r->reaper_state = KVM_DIRTY_RING_REAPER_REAPING; qemu_mutex_lock_iothread(); - kvm_dirty_ring_reap(s); + kvm_dirty_ring_reap(s, NULL); qemu_mutex_unlock_iothread(); r->reaper_iteration++; @@ -2315,6 +2325,11 @@ static void query_stats_cb(StatsResultList **result, StatsTarget target, strList *names, strList *targets, Error **errp); static void query_stats_schemas_cb(StatsSchemaList **result, Error **errp); +uint32_t kvm_dirty_ring_size(void) +{ + return kvm_state->kvm_dirty_ring_size; +} + static int kvm_init(MachineState *ms) { MachineClass *mc = MACHINE_GET_CLASS(ms); @@ -2967,8 +2982,19 @@ int kvm_cpu_exec(CPUState *cpu) */ trace_kvm_dirty_ring_full(cpu->cpu_index); qemu_mutex_lock_iothread(); - kvm_dirty_ring_reap(kvm_state); + /* + * We throttle vCPU by making it sleep once it exit from kernel + * due to dirty ring full. In the dirtylimit scenario, reaping + * all vCPUs after a single vCPU dirty ring get full result in + * the miss of sleep, so just reap the ring-fulled vCPU. + */ + if (dirtylimit_in_service()) { + kvm_dirty_ring_reap(kvm_state, cpu); + } else { + kvm_dirty_ring_reap(kvm_state, NULL); + } qemu_mutex_unlock_iothread(); + dirtylimit_vcpu_execute(cpu); ret = 0; break; case KVM_EXIT_SYSTEM_EVENT: |