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KVM: trace kvm_halt_poll_ns grow/shrink

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Tracepoint for dynamic halt_pool_ns, fired on every potential change.

Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wanpeng Li 2015-09-03 22:07:39 +08:00 committed by Paolo Bonzini
parent aca6ff29c4
commit 2cbd78244f
2 changed files with 36 additions and 2 deletions
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30
include/trace/events/kvm.h
View File

@ -356,6 +356,36 @@ TRACE_EVENT(
__entry->address)
);
TRACE_EVENT(kvm_halt_poll_ns,
TP_PROTO(bool grow, unsigned int vcpu_id, int new, int old),
TP_ARGS(grow, vcpu_id, new, old),
TP_STRUCT__entry(
__field(bool, grow)
__field(unsigned int, vcpu_id)
__field(int, new)
__field(int, old)
),
TP_fast_assign(
__entry->grow = grow;
__entry->vcpu_id = vcpu_id;
__entry->new = new;
__entry->old = old;
),
TP_printk("vcpu %u: halt_poll_ns %d (%s %d)",
__entry->vcpu_id,
__entry->new,
__entry->grow ? "grow" : "shrink",
__entry->old)
);
#define trace_kvm_halt_poll_ns_grow(vcpu_id, new, old) \
trace_kvm_halt_poll_ns(true, vcpu_id, new, old)
#define trace_kvm_halt_poll_ns_shrink(vcpu_id, new, old) \
trace_kvm_halt_poll_ns(false, vcpu_id, new, old)
#endif
#endif /* _TRACE_KVM_MAIN_H */

8
virt/kvm/kvm_main.c
View File

@ -1918,8 +1918,9 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
{
int val = vcpu->halt_poll_ns;
int old, val;
old = val = vcpu->halt_poll_ns;
/* 10us base */
if (val == 0 && halt_poll_ns_grow)
val = 10000;
@ -1927,18 +1928,21 @@ static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
val *= halt_poll_ns_grow;
vcpu->halt_poll_ns = val;
trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
}
static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
{
int val = vcpu->halt_poll_ns;
int old, val;
old = val = vcpu->halt_poll_ns;
if (halt_poll_ns_shrink == 0)
val = 0;
else
val /= halt_poll_ns_shrink;
vcpu->halt_poll_ns = val;
trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
}
static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)