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src/slave/containerizer/mesos/isolators/cgroups/perf_event.cpp (lines 132 - 134)
<https://reviews.apache.org/r/43284/#comment179538>

    I think you should discard the future and let it do the correct thing -- 
kill and reap the perf process -- rather than do a blocking await. The perf 
sample interval is configurable and typical values are 10's of seconds.
    
    Note: I'm not sure if the correct behavior is implemented...


- Ian Downes


On Feb. 7, 2016, 12:19 a.m., haosdent huang wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/43284/
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> 
> (Updated Feb. 7, 2016, 12:19 a.m.)
> 
> 
> Review request for mesos, Ian Downes, Jan Schlicht, and Paul Brett.
> 
> 
> Bugs: MESOS-4039
>     https://issues.apache.org/jira/browse/MESOS-4039
> 
> 
> 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
> 
>

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