Benjamin Mahler created MESOS-9081:
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Summary: cgroups::verify is expensive and is done implicitly
during cgroups operations
Key: MESOS-9081
URL: https://issues.apache.org/jira/browse/MESOS-9081
Project: Mesos
Issue Type: Improvement
Components: containerization
Reporter: Benjamin Mahler
See MESOS-8418 for how this initially came up.
Currently, many of the cgroup helper functions perform an internal verify:
https://github.com/apache/mesos/blob/1.6.0/src/linux/cgroups.cpp#L922
This reads /procs/mounts to see which cgroups subsystems are mounted, and
/proc/mounts can get rather large and expensive to read.
The steady state case (polling /containers and /monitor/snapshot to retrieve
container resource usage statistics) was addressed with a short term patch in
MESOS-8418. However, we should consider some longer-term fixes that address
performance of other events that incur cgroup operations (e.g. updating
resources of a container, launching a container, etc):
1. Consider moving the verify function to public and have the isolators use it
where appropriate.
2. Complementary to 1, optimize verify (e.g. read /proc/self/mountstats as
suggested in MESOS-8418).
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