This can be used to skip tests or provide different test values on
different platforms. For example to run a test only where Arm SVE is
present add this to the config section:
auxv = auxv["AT_HWCAP"] & 0x200000 == 0x200000
The value is a freeform Python expression that is evaled in the context
of a map called "auxv" that contains the decoded auxiliary vector.
Signed-off-by: James Clark <james.clark@xxxxxxx>
---
tools/perf/tests/attr.py | 33 +++++++++++++++++++++++++++++++--
1 file changed, 31 insertions(+), 2 deletions(-)
diff --git a/tools/perf/tests/attr.py b/tools/perf/tests/attr.py
index cf40df472918..eceb6d022141 100644
--- a/tools/perf/tests/attr.py
+++ b/tools/perf/tests/attr.py
@@ -8,7 +8,9 @@ import glob
import optparse
import tempfile
import logging
+import re
import shutil
+import subprocess
try:
import configparser
@@ -134,6 +136,8 @@ class Event(dict):
# 'arch' - architecture specific test (optional)
# comma separated list, ! at the beginning
# negates it.
+# 'auxv' - Truthy statement that is evaled in the scope of the auxv map. When false,
+# the test is skipped. For example 'auxv["AT_HWCAP"] == 10'. (optional)
#
# [eventX:base]
# - one or multiple instances in file
@@ -164,6 +168,7 @@ class Test(object):
except:
self.arch = ''
+ self.auxv = parser.get('config', 'auxv', fallback=None)
self.expect = {}
self.result = {}
log.debug(" loading expected events");
@@ -175,7 +180,28 @@ class Test(object):
else:
return True
- def skip_test(self, myarch):
+ def skip_test_auxv(self):
+ def new_auxv(a, pattern):
+ items = list(filter(None, pattern.split(a)))
+ # AT_HWCAP is hex but doesn't have a prefix, so special case it
+ if items[0] == "AT_HWCAP":
+ value = int(items[-1], 16)
+ else:
+ try:
+ value = int(items[-1], 0)
+ except:
+ value = items[-1]
+ return (items[0], value)
+
+ if not self.auxv:
+ return False
+ auxv = subprocess.check_output("LD_SHOW_AUXV=1 sleep 0", shell=True) \
+ .decode(sys.stdout.encoding)
+ pattern = re.compile(r"[: ]+")
+ auxv = dict([new_auxv(a, pattern) for a in auxv.splitlines()])
+ return not eval(self.auxv)
+
+ def skip_test_arch(self, myarch):
# If architecture not set always run test
if self.arch == '':
# log.warning("test for arch %s is ok" % myarch)
@@ -225,9 +251,12 @@ class Test(object):
def run_cmd(self, tempdir):
junk1, junk2, junk3, junk4, myarch = (os.uname())
- if self.skip_test(myarch):
+ if self.skip_test_arch(myarch):
raise Notest(self, myarch)
+ if self.skip_test_auxv():
+ raise Notest(self, "auxv skip")
+
cmd = "PERF_TEST_ATTR=%s %s %s -o %s/perf.data %s" % (tempdir,
self.perf, self.command, tempdir, self.args)
ret = os.WEXITSTATUS(os.system(cmd))
--
2.25.1
