[jira] [Assigned] (MESOS-9081) cgroups::verify is expensive and is done implicitly during cgroups operations

["Jie Yu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MESOS-9081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jie Yu reassigned MESOS-9081:
-----------------------------

    Assignee: Jie Yu

> 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
>            Assignee: Jie Yu
>            Priority: Major
>              Labels: performance
>
> 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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