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KVM: fix tracing kvm_try_async_get_page 

Tracing 'async' and *pfn is useless, since 'async' is always true,
and '*pfn' is always "fault_pfn'

We can trace 'gva' and 'gfn' instead, it can help us to see the
life-cycle of an async_pf

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-11-01 16:58:43 +08:00 committed by Avi Kivity
parent 2653503769
commit c9b263d2be
2 changed files with 8 additions and 6 deletions
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2
arch/x86/kvm/mmu.c
View File

@ -2628,7 +2628,7 @@ static bool try_async_pf(struct kvm_vcpu *vcpu, bool no_apf, gfn_t gfn,
put_page(pfn_to_page(*pfn));
if (!no_apf && can_do_async_pf(vcpu)) {
trace_kvm_try_async_get_page(async, *pfn);
trace_kvm_try_async_get_page(gva, gfn);
if (kvm_find_async_pf_gfn(vcpu, gfn)) {
trace_kvm_async_pf_doublefault(gva, gfn);
kvm_make_request(KVM_REQ_APF_HALT, vcpu);

12
include/trace/events/kvm.h
View File

@ -218,18 +218,20 @@ TRACE_EVENT(kvm_age_page,
#ifdef CONFIG_KVM_ASYNC_PF
TRACE_EVENT(
kvm_try_async_get_page,
TP_PROTO(bool async, u64 pfn),
TP_ARGS(async, pfn),
TP_PROTO(u64 gva, u64 gfn),
TP_ARGS(gva, gfn),
TP_STRUCT__entry(
__field(__u64, pfn)
__field(u64, gva)
__field(u64, gfn)
),
TP_fast_assign(
__entry->pfn = (!async) ? pfn : (u64)-1;
__entry->gva = gva;
__entry->gfn = gfn;
),
TP_printk("pfn %#llx", __entry->pfn)
TP_printk("gva = %#llx, gfn = %#llx", __entry->gva, __entry->gfn)
);
TRACE_EVENT(