1# Copyright (C) 2013-2021 Free Software Foundation, Inc.
2
3# This program is free software; you can redistribute it and/or modify
4# it under the terms of the GNU General Public License as published by
5# the Free Software Foundation; either version 3 of the License, or
6# (at your option) any later version.
7#
8# This program is distributed in the hope that it will be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License
14# along with this program.  If not, see <http://www.gnu.org/licenses/>.
15
16from perftest import perftest
17
18
19class BackTrace(perftest.TestCaseWithBasicMeasurements):
20    def __init__(self, depth):
21        super(BackTrace, self).__init__("backtrace")
22        self.depth = depth
23
24    def warm_up(self):
25        # Warm up.
26        gdb.execute("bt", False, True)
27        gdb.execute("bt", False, True)
28
29    def _do_test(self):
30        """Do backtrace multiple times."""
31        do_test_command = "bt %d" % self.depth
32        for _ in range(1, 15):
33            gdb.execute(do_test_command, False, True)
34
35    def execute_test(self):
36
37        line_size = 2
38        for _ in range(1, 12):
39            # Keep the total size of dcache unchanged, and increase the
40            # line-size in the loop.
41            line_size_command = "set dcache line-size %d" % (line_size)
42            size_command = "set dcache size %d" % (4096 * 64 / line_size)
43            # Cache is cleared by changing line-size or size.
44            gdb.execute(line_size_command)
45            gdb.execute(size_command)
46
47            func = lambda: self._do_test()
48
49            self.measure.measure(func, line_size)
50
51            line_size *= 2
52