GDB 7.6.50

gdb/testsuite/gdb.perf/backtrace.py

Index: gdb/testsuite/gdb.perf/backtrace.py
diff --git a/gdb/testsuite/gdb.perf/backtrace.py b/gdb/testsuite/gdb.perf/backtrace.py
new file mode 100644
index 0000000000000000000000000000000000000000..447ab54d04aac66506c62ccc96f51d97161ecaf3
--- /dev/null
+++ b/gdb/testsuite/gdb.perf/backtrace.py
@@ -0,0 +1,50 @@
+# Copyright (C) 2013 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from perftest import perftest
+
+class BackTrace (perftest.TestCaseWithBasicMeasurements):
+    def __init__(self, depth):
+        super (BackTrace, self).__init__ ("backtrace")
+        self.depth = depth
+
+    def warm_up(self):
+        # Warm up.
+        gdb.execute ("bt", False, True)
+        gdb.execute ("bt", False, True)
+
+    def _do_test(self):
+        """Do backtrace multiple times."""
+        do_test_command = "bt %d" % self.depth
+        for _ in range(1, 15):
+            gdb.execute (do_test_command, False, True)
+
+    def execute_test(self):
+
+        line_size = 2
+        for _ in range(1, 12):
+            # Keep the total size of dcache unchanged, and increase the
+            # line-size in the loop.
+            line_size_command = "set dcache line-size %d" % (line_size)
+            size_command = "set dcache size %d" % (4096 * 64 / line_size)
+            # Cache is cleared by changing line-size or size.
+            gdb.execute (line_size_command)
+            gdb.execute (size_command)
+
+            func = lambda: self._do_test()
+
+            self.measure.measure(func, line_size)
+
+            line_size *= 2