diff options
| author | Alan Maguire <alan.maguire@oracle.com> | 2020-02-19 09:33:29 +0000 |
|---|---|---|
| committer | Shuah Khan <skhan@linuxfoundation.org> | 2020-05-01 09:25:39 -0600 |
| commit | 57c4cfd4a2eef8f94052bd7c0fce0981f74fb213 (patch) | |
| tree | 48fe2e8679bb819f8e7b0538c1a59e1c335a5dee /tools | |
| parent | f0c0d0cf590f71b2213b29a7ded2cde3d0a1a0ba (diff) | |
ftrace/selftests: workaround cgroup RT scheduling issues
wakeup_rt.tc and wakeup.tc tests in tracers/ subdirectory
fail due to the chrt command returning:
chrt: failed to set pid 0's policy: Operation not permitted.
To work around this, temporarily disable grout RT scheduling
during ftracetest execution. Restore original value on
test run completion. With these changes in place, both
tests consistently pass.
Fixes: c575dea2c1a5 ("selftests/ftrace: Add wakeup_rt tracer testcase")
Fixes: c1edd060b413 ("selftests/ftrace: Add wakeup tracer testcase")
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Diffstat (limited to 'tools')
| -rwxr-xr-x | tools/testing/selftests/ftrace/ftracetest | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest index 063ecb290a5a..144308a757b7 100755 --- a/tools/testing/selftests/ftrace/ftracetest +++ b/tools/testing/selftests/ftrace/ftracetest @@ -29,8 +29,25 @@ err_ret=1 # kselftest skip code is 4 err_skip=4 +# cgroup RT scheduling prevents chrt commands from succeeding, which +# induces failures in test wakeup tests. Disable for the duration of +# the tests. + +readonly sched_rt_runtime=/proc/sys/kernel/sched_rt_runtime_us + +sched_rt_runtime_orig=$(cat $sched_rt_runtime) + +setup() { + echo -1 > $sched_rt_runtime +} + +cleanup() { + echo $sched_rt_runtime_orig > $sched_rt_runtime +} + errexit() { # message echo "Error: $1" 1>&2 + cleanup exit $err_ret } @@ -39,6 +56,8 @@ if [ `id -u` -ne 0 ]; then errexit "this must be run by root user" fi +setup + # Utilities absdir() { # file_path (cd `dirname $1`; pwd) @@ -235,6 +254,7 @@ TOTAL_RESULT=0 INSTANCE= CASENO=0 + testcase() { # testfile CASENO=$((CASENO+1)) desc=`grep "^#[ \t]*description:" $1 | cut -f2 -d:` @@ -406,5 +426,7 @@ prlog "# of unsupported: " `echo $UNSUPPORTED_CASES | wc -w` prlog "# of xfailed: " `echo $XFAILED_CASES | wc -w` prlog "# of undefined(test bug): " `echo $UNDEFINED_CASES | wc -w` +cleanup + # if no error, return 0 exit $TOTAL_RESULT |