Tracepoint for dynamic PLE window, fired on every potential change.
Signed-off-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
---
arch/x86/kvm/trace.h | 29 +++++++++++++++++++++++++++++
arch/x86/kvm/vmx.c | 4 ++++
arch/x86/kvm/x86.c | 1 +
3 files changed, 34 insertions(+)
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index e850a7d..e4682f5 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -848,6 +848,35 @@ TRACE_EVENT(kvm_track_tsc,
__print_symbolic(__entry->host_clock, host_clocks))
);
+TRACE_EVENT(kvm_ple_window,
+ TP_PROTO(int grow, unsigned int vcpu_id, int new, int old),
+ TP_ARGS(grow, vcpu_id, new, old),
+
+ TP_STRUCT__entry(
+ __field( int, 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: ple_window %d %s %d",
+ __entry->vcpu_id,
+ __entry->new,
+ __entry->grow ? "<+" : "<-",
+ __entry->old)
+);
+#define trace_kvm_ple_window_grow(vcpu_id, new, old) \
+ trace_kvm_ple_window(1, vcpu_id, new, old)
+#define trace_kvm_ple_window_shrink(vcpu_id, new, old) \
+ trace_kvm_ple_window(0, vcpu_id, new, old)
+
#endif /* CONFIG_X86_64 */
#endif /* _TRACE_KVM_H */
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e1192fb..a236a9f 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5709,6 +5709,8 @@ static void grow_ple_window(struct kvm_vcpu *vcpu)
new = old + ple_window_grow;
vmx->ple_window = min(new, ple_window_max);
+
+ trace_kvm_ple_window_grow(vcpu->vcpu_id, vmx->ple_window, old);
}
static void shrink_ple_window(struct kvm_vcpu *vcpu)
@@ -5725,6 +5727,8 @@ static void shrink_ple_window(struct kvm_vcpu *vcpu)
new = old - ple_window_shrink;
vmx->ple_window = max(new, ple_window);
+
+ trace_kvm_ple_window_shrink(vcpu->vcpu_id, vmx->ple_window, old);
}
/*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5696ee7..814b20c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7648,3 +7648,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window);
--
2.0.4
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
