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KVM: MMU: trace fast page fault 

To see what happen on this path and help us to optimize it

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2012-06-20 15:59:41 +08:00 committed by Avi Kivity
parent c7ba5b48cc
commit a72faf2504
2 changed files with 40 additions and 0 deletions
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2
arch/x86/kvm/mmu.c
View File

@ -2776,6 +2776,8 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level,
*/
ret = fast_pf_fix_direct_spte(vcpu, iterator.sptep, spte);
exit:
trace_fast_page_fault(vcpu, gva, error_code, iterator.sptep,
spte, ret);
walk_shadow_page_lockless_end(vcpu);
return ret;

38
arch/x86/kvm/mmutrace.h
View File

@ -243,6 +243,44 @@ TRACE_EVENT(
TP_printk("addr:%llx gfn %llx access %x", __entry->addr, __entry->gfn,
__entry->access)
);
#define __spte_satisfied(__spte) \
(__entry->retry && is_writable_pte(__entry->__spte))
TRACE_EVENT(
fast_page_fault,
TP_PROTO(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code,
u64 *sptep, u64 old_spte, bool retry),
TP_ARGS(vcpu, gva, error_code, sptep, old_spte, retry),
TP_STRUCT__entry(
__field(int, vcpu_id)
__field(gva_t, gva)
__field(u32, error_code)
__field(u64 *, sptep)
__field(u64, old_spte)
__field(u64, new_spte)
__field(bool, retry)
),
TP_fast_assign(
__entry->vcpu_id = vcpu->vcpu_id;
__entry->gva = gva;
__entry->error_code = error_code;
__entry->sptep = sptep;
__entry->old_spte = old_spte;
__entry->new_spte = *sptep;
__entry->retry = retry;
),
TP_printk("vcpu %d gva %lx error_code %s sptep %p old %#llx"
" new %llx spurious %d fixed %d", __entry->vcpu_id,
__entry->gva, __print_flags(__entry->error_code, "|",
kvm_mmu_trace_pferr_flags), __entry->sptep,
__entry->old_spte, __entry->new_spte,
__spte_satisfied(old_spte), __spte_satisfied(new_spte)
)
);
#endif /* _TRACE_KVMMMU_H */
#undef TRACE_INCLUDE_PATH