[Xen-devel] [PATCH XTF perf 4/4] perf: measure MMUEXT_MARK_SUPER test

[Norbert Manthey <nmanthey@xxxxxxxxx>]

A first simple test is to call a hypercall in a tight loop. To measure
implementation aspects of the hypervisor, we picked a hypercall that
is not implemented and hence results in a no-op, namely the hypercall
mmuext_op with the command MMUEXT_MARK_SUPER.

Signed-off-by: Norbert Manthey <nmanthey@xxxxxxxxx>

---
 tests/perf-PV-MMUEXT_MARK_SUPER-noop/Makefile |  9 ++++
 tests/perf-PV-MMUEXT_MARK_SUPER-noop/main.c   | 66 +++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 tests/perf-PV-MMUEXT_MARK_SUPER-noop/Makefile
 create mode 100644 tests/perf-PV-MMUEXT_MARK_SUPER-noop/main.c

diff --git a/tests/perf-PV-MMUEXT_MARK_SUPER-noop/Makefile 
b/tests/perf-PV-MMUEXT_MARK_SUPER-noop/Makefile
new file mode 100644
--- /dev/null
+++ b/tests/perf-PV-MMUEXT_MARK_SUPER-noop/Makefile
@@ -0,0 +1,9 @@
+include $(ROOT)/build/common.mk
+
+NAME      := perf-PV-MMUEXT_MARK_SUPER-noop
+CATEGORY  := perf
+TEST-ENVS := pv64
+
+obj-perenv += main.o
+
+include $(ROOT)/build/gen.mk
diff --git a/tests/perf-PV-MMUEXT_MARK_SUPER-noop/main.c 
b/tests/perf-PV-MMUEXT_MARK_SUPER-noop/main.c
new file mode 100644
--- /dev/null
+++ b/tests/perf-PV-MMUEXT_MARK_SUPER-noop/main.c
@@ -0,0 +1,66 @@
+/**
+ * @file tests/perf-PV-MMUEXT_MARK_SUPER-noop/main.c
+ * @ref test-perf-PV-MMUEXT_MARK_SUPER-noop
+ *
+ * @page perf-PV-MMUEXT_MARK_SUPER-noop
+ *
+ * This test runs the hypercall mmuext_op with the command MMUEXT_MARK_SUPER in
+ * a tight loop, and measures how much time it takes for all loops. Finally, 
the
+ * test prints this time.
+ *
+ * Since this is a performance test, the actual value is furthermore printed
+ * using the predefined pattern on a separate line. The reported value
+ * represents the time it takes to run the mmuext_op hypercall in nano seconds.
+ * The average is calculated by using 500000000 calls.
+ *
+ * perf <testname> <value>
+ *
+ * @see tests/perf-PV-MMUEXT_MARK_SUPER-noop/main.c
+ */
+
+#define MEASUREMENT_RETRIES 500000000
+
+#include <xtf/time.h>
+#include <xtf.h>
+
+const char test_title[] = "Test MMUEXT_MARK_SUPER";
+
+/* Use a global struct to avoid local variables in call_MMUEXT_MARK_SUPER */
+mmuext_op_t op =
+{
+    .cmd = MMUEXT_MARK_SUPER,
+};
+
+/* Schedule a no-op hypercall */
+int call_MMUEXT_MARK_SUPER(void)
+{
+    return hypercall_mmuext_op(&op, 1, NULL, DOMID_SELF);
+}
+
+void test_main(void)
+{
+    int rc = 0;
+
+    /* Test whether the hypercall is implemented as expected */
+    rc = hypercall_mmuext_op(&op, 1, NULL, DOMID_SELF);
+    if(rc != -EOPNOTSUPP)
+        return xtf_error("Unexpected MMUEXT_MARK_SUPER, rc %d\n", rc);
+
+    /* Measure and print to screen how long calling this hypercall takes */
+    measure_performance(test_title,
+                        "mmuext_op(MMUEXT_MARK_SUPER, ...)",
+                        MEASUREMENT_RETRIES,
+                        call_MMUEXT_MARK_SUPER);
+
+    return xtf_success("Success: performed MMUEXT_MARK_SUPER hypercall with 
expected result\n");
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.7.4




Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrer: Christian Schlaeger, Ralf Herbrich
Ust-ID: DE 289 237 879
Eingetragen am Amtsgericht Charlottenburg HRB 149173 B



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