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(Updated Feb. 14, 2016, 7:59 a.m.) Review request for mesos, Ian Downes, Jan Schlicht, and Paul Brett. Bugs: MESOS-4655 https://issues.apache.org/jira/browse/MESOS-4655 Repository: mesos Description ------- Wait for perf statistics processes exit. Diffs ----- src/slave/containerizer/mesos/isolators/cgroups/perf_event.hpp 65e731886b9e5cac07ae3ad6398faf8f50de5650 src/slave/containerizer/mesos/isolators/cgroups/perf_event.cpp 5ef4ae5c468580352cd16e7716b9ca4c0acde659 Diff: https://reviews.apache.org/r/43284/diff/ Testing ------- Without this patch, when running ``` sudo GLOG_v=1 ./bin/mesos-tests.sh --gtest_filter="PerfEventIsolatorTest.ROOT_CGROUPS_Sample" --verbose ``` , would got this error ``` [----------] Global test environment tear-down ../../src/tests/environment.cpp:732: Failure Failed Tests completed with child processes remaining: -+- 16501 /home/haosdent/mesos/build/src/.libs/lt-mesos-tests --gtest_filter=PerfEventIsolatorTest.ROOT_CGROUPS_Sample --verbose |-+- 16580 /home/haosdent/mesos/build/src/.libs/lt-mesos-tests --gtest_filter=PerfEventIsolatorTest.ROOT_CGROUPS_Sample --verbose | -+- 16582 perf stat --all-cpus --field-separator , --log-fd 1 --event cycles --cgroup mesos/239d30bb-f7a1-413b-9d99-0914149d5899 --event task-clock --cgroup mesos/239d30bb-f7a1-413b-9d99-0914149d5899 -- sleep 0.25 | --- 16584 sleep 0.25 --- 16581 () [==========] 1 test from 1 test case ran. (4095 ms total) ``` This also fix similar error in `MesosContainerizerSlaveRecoveryTest.CGROUPS_ROOT_PerfRollForward` and `CgroupsAnyHierarchyWithPerfEventTest.ROOT_CGROUPS_Perf`. Thanks, haosdent huang