[v2,2/4] perf test: Add mechanism for skipping attr tests on auxiliary vector values
Commit Message
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@arm.com>
---
tools/perf/tests/attr.py | 33 +++++++++++++++++++++++++++++++--
1 file changed, 31 insertions(+), 2 deletions(-)
@@ -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))