nyan: power_CPUFreq: No such file or directory: '/sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq' |
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Issue descriptionSeems there's a race between switching governors from interactive to userspace and then being able to read scaling_cur_freq which is also dependent on system load. Lots of failures of this test on nyan_* platforms, https://stainless.corp.google.com/search?view=list&first_date=2018-01-04&last_date=2018-05-31&suite=%5Epower%5C_build%24&test=%5Epower_CPUFreq%24&board=nyan_*&status=GOOD&status=FAIL&status=ERROR&status=ABORT&exclude_cts=true&exclude_not_run=false&exclude_non_release=true&exclude_au=true&exclude_acts=true&exclude_retried=true&exclude_non_production=false Seems to fail roughly 5 times to every pass. Have been able to repro manually on lab host by ssh'ing to device and then doing the following: # load while true ; do true ; sleep .1 ; done & # test cd /sys/devices/system/cpu while true ; do echo userspace > cpu0/cpufreq/scaling_governor cat cpu*/cpufreq/scaling_cur_freq date echo interactive > cpu0/cpufreq/scaling_governor sleep 1 done If the output of 'test' is only one line than 'cat cpu1/cpufreq/scaling_cur_freq' has failed. For example below is 2 failures in a row, 828000 Thu May 31 08:48:11 PDT 2018 696000 Thu May 31 08:48:13 PDT 2018
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Jun 8 2018
The following revision refers to this bug: https://chromium.googlesource.com/chromiumos/third_party/autotest/+/6655c3c1a7f4dabc344319b2831ea0516166ec2c commit 6655c3c1a7f4dabc344319b2831ea0516166ec2c Author: Todd Broch <tbroch@chromium.org> Date: Fri Jun 08 06:33:06 2018 power_CPUFreq: cleanup style errors. Used, pyformat -i --force_quote_type single -s 4 --binpack_named_arguments to cleanup style issues. Also cleaned up most of pylint issues. BUG= chromium:848309 TEST=power_CPUFreq Change-Id: Ie19753812ef1d552addb001f5966dd44892f8dd2 Reviewed-on: https://chromium-review.googlesource.com/1085374 Commit-Ready: Todd Broch <tbroch@chromium.org> Tested-by: Todd Broch <tbroch@chromium.org> Reviewed-by: Mengqi Guo <mqg@chromium.org> [modify] https://crrev.com/6655c3c1a7f4dabc344319b2831ea0516166ec2c/client/site_tests/power_CPUFreq/power_CPUFreq.py
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Jun 8 2018
The following revision refers to this bug: https://chromium.googlesource.com/chromiumos/third_party/autotest/+/5bda238a7ec1615f2be3f4085abde6b74ef53e02 commit 5bda238a7ec1615f2be3f4085abde6b74ef53e02 Author: Todd Broch <tbroch@chromium.org> Date: Fri Jun 08 06:33:07 2018 power_CPUFreq: Add retry for set_frequency. BUG= chromium:848309 TEST=power_CPUFreq no longer fails sporadically on nyan devices Change-Id: I805ab8551f4c22a76ab4ef762dac889ffd8ea553 Reviewed-on: https://chromium-review.googlesource.com/1085375 Commit-Ready: Todd Broch <tbroch@chromium.org> Tested-by: Todd Broch <tbroch@chromium.org> Reviewed-by: Mengqi Guo <mqg@chromium.org> [modify] https://crrev.com/5bda238a7ec1615f2be3f4085abde6b74ef53e02/client/site_tests/power_CPUFreq/power_CPUFreq.py
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Jun 8 2018
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Comment 1 by tbroch@chromium.org
, Jun 4 2018Traceback (most recent call last): File "/usr/local/autotest/common_lib/test.py", line 631, in _exec _call_test_function(self.execute, *p_args, **p_dargs) File "/usr/local/autotest/common_lib/test.py", line 837, in _call_test_function raise error.UnhandledTestFail(e) UnhandledTestFail: Unhandled IOError: [Errno 2] No such file or directory: '/sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq' Traceback (most recent call last): File "/usr/local/autotest/common_lib/test.py", line 831, in _call_test_function return func(*args, **dargs) File "/usr/local/autotest/common_lib/test.py", line 495, in execute dargs) File "/usr/local/autotest/common_lib/test.py", line 362, in _call_run_once_with_retry postprocess_profiled_run, args, dargs) File "/usr/local/autotest/common_lib/test.py", line 400, in _call_run_once self.run_once(*args, **dargs) File "/usr/local/autotest/tests/power_CPUFreq/power_CPUFreq.py", line 37, in run_once self.test_cores_in_series(dirs) File "/usr/local/autotest/tests/power_CPUFreq/power_CPUFreq.py", line 73, in test_cores_in_series cpu.set_frequency(freq) File "/usr/local/autotest/tests/power_CPUFreq/power_CPUFreq.py", line 192, in set_frequency if frequency >= self.get_current_frequency(): File "/usr/local/autotest/tests/power_CPUFreq/power_CPUFreq.py", line 185, in get_current_frequency freq = int(self.__read_file('scaling_cur_freq')) File "/usr/local/autotest/tests/power_CPUFreq/power_CPUFreq.py", line 135, in __read_file f = open(path, 'r') IOError: [Errno 2] No such file or directory: '/sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq'