linux-kernel - [PATCH v4 2/9] KVM: Add event to trace tlb invalidations

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Message-Id: <20170131171630.26898-3-punit.agrawal@arm.com>
Date:   Tue, 31 Jan 2017 17:16:23 +0000
From:   Punit Agrawal <punit.agrawal@....com>
To:     kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org
Cc:     Punit Agrawal <punit.agrawal@....com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH v4 2/9] KVM: Add event to trace tlb invalidations

As TLB operations can have an impact on system performance, add a trace
event to enable monitoring of guest TLB maintenance operations.

Signed-off-by: Punit Agrawal <punit.agrawal@....com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>
---
 include/trace/events/kvm.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
index 8ade3eb6c640..fbe33089264c 100644
--- a/include/trace/events/kvm.h
+++ b/include/trace/events/kvm.h
@@ -393,6 +393,24 @@ TRACE_EVENT(kvm_halt_poll_ns,
 #define trace_kvm_halt_poll_ns_shrink(vcpu_id, new, old) \
 	trace_kvm_halt_poll_ns(false, vcpu_id, new, old)
 
+TRACE_EVENT(kvm_tlb_invalidate,
+	TP_PROTO(unsigned long vcpu_pc, u32 opcode),
+	TP_ARGS(vcpu_pc, opcode),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, vcpu_pc)
+		__field(u32, opcode)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_pc = vcpu_pc;
+		__entry->opcode = opcode;
+	),
+
+	TP_printk("vcpu_pc=0x%16lx opcode=%08x", __entry->vcpu_pc,
+		  __entry->opcode)
+);
+
 #endif /* _TRACE_KVM_MAIN_H */
 
 /* This part must be outside protection */
-- 
2.11.0