From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
To: <linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>
Cc: <pbonzini@redhat.com>, <mlevitsk@redhat.com>, <seanjc@google.com>,
<joro@8bytes.org>, <jon.grimm@amd.com>, <wei.huang2@amd.com>,
<terry.bowman@amd.com>,
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Subject: [PATCH 2/2] KVM: SVM: Introduce trace point for the slow-path of avic_kic_target_vcpus
Date: Thu, 14 Apr 2022 00:11:51 -0500 [thread overview]
Message-ID: <20220414051151.77710-3-suravee.suthikulpanit@amd.com> (raw)
In-Reply-To: <20220414051151.77710-1-suravee.suthikulpanit@amd.com>
This can help identify potential performance issues when handles
AVIC incomplete IPI due vCPU not running.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
arch/x86/kvm/svm/avic.c | 2 ++
arch/x86/kvm/trace.h | 20 ++++++++++++++++++++
arch/x86/kvm/x86.c | 1 +
3 files changed, 23 insertions(+)
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 92d8e0de1fb4..e5fb4931a2f1 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -440,6 +440,8 @@ static void avic_kick_target_vcpus(struct kvm *kvm, struct kvm_lapic *source,
if (!avic_kick_target_vcpus_fast(kvm, source, icrl, icrh, index))
return;
+ trace_kvm_avic_kick_vcpu_slowpath(icrh, icrl, index);
+
/*
* Wake any target vCPUs that are blocking, i.e. waiting for a wake
* event. There's no need to signal doorbells, as hardware has handled
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index e3a24b8f04be..de4762517569 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1459,6 +1459,26 @@ TRACE_EVENT(kvm_avic_ga_log,
__entry->vmid, __entry->vcpuid)
);
+TRACE_EVENT(kvm_avic_kick_vcpu_slowpath,
+ TP_PROTO(u32 icrh, u32 icrl, u32 index),
+ TP_ARGS(icrh, icrl, index),
+
+ TP_STRUCT__entry(
+ __field(u32, icrh)
+ __field(u32, icrl)
+ __field(u32, index)
+ ),
+
+ TP_fast_assign(
+ __entry->icrh = icrh;
+ __entry->icrl = icrl;
+ __entry->index = index;
+ ),
+
+ TP_printk("icrh:icrl=%#08x:%08x, index=%u",
+ __entry->icrh, __entry->icrl, __entry->index)
+);
+
TRACE_EVENT(kvm_hv_timer_state,
TP_PROTO(unsigned int vcpu_id, unsigned int hv_timer_in_use),
TP_ARGS(vcpu_id, hv_timer_in_use),
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d0fac57e9996..c2da6c7516b0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12978,6 +12978,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_ga_log);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_kick_vcpu_slowpath);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_accept_irq);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_enter);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_exit);
--
2.25.1
next prev parent reply other threads:[~2022-04-14 5:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-14 5:11 [PATCH 0/2] KVM: SVM: Optimize AVIC incomplete IPI #vmexit handling Suravee Suthikulpanit
2022-04-14 5:11 ` [PATCH 1/2] KVM: SVM: Introduce avic_kick_target_vcpus_fast() Suravee Suthikulpanit
2022-04-14 19:21 ` Sean Christopherson
2022-04-18 11:02 ` Maxim Levitsky
2022-04-14 5:11 ` Suravee Suthikulpanit [this message]
2022-04-18 11:03 ` [PATCH 2/2] KVM: SVM: Introduce trace point for the slow-path of avic_kic_target_vcpus Maxim Levitsky
2022-04-18 14:39 ` [PATCH 0/2] KVM: SVM: Optimize AVIC incomplete IPI #vmexit handling Suravee Suthikulpanit
2022-04-20 15:49 [PATCH V2 " Suravee Suthikulpanit
2022-04-20 15:49 ` [PATCH 2/2] KVM: SVM: Introduce trace point for the slow-path of avic_kic_target_vcpus Suravee Suthikulpanit
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