Kernel/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-01-09 23:00:21 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

perf test: Add mechanism for skipping attr tests on auxiliary vector values

Browse Source 
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>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20221213114739.2312862-3-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
James Clark 2022-12-13 11:47:37 +00:00 committed by Arnaldo Carvalho de Melo
parent a8f26192ca
commit c3a8f85351
1 changed files with 31 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
tools/perf/tests/attr.py
View File

@ -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))