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From "Jie Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-4697) Consolidate cgroup isolators into one single isolator.
Date Wed, 14 Sep 2016 23:49:20 GMT

    [ https://issues.apache.org/jira/browse/MESOS-4697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15491797#comment-15491797
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Jie Yu commented on MESOS-4697:
-------------------------------

Also, we need to add a blkio subsystem, which should be pretty simple.

> Consolidate cgroup isolators into one single isolator.
> ------------------------------------------------------
>
>                 Key: MESOS-4697
>                 URL: https://issues.apache.org/jira/browse/MESOS-4697
>             Project: Mesos
>          Issue Type: Epic
>            Reporter: Jie Yu
>            Assignee: haosdent
>         Attachments: cgroup_v2.pdf
>
>
> There are two motivations for this:
> 1) It's very verbose to add a new isolator. For cgroup isolators (e.g., cpu, mem, net_cls,
etc.), many of the logics are the same. We are currently duplicating a lot of the code.
> 2) Initially, we decided to use a separate isolator for each cgroup subsystem is because
we want each subsystem to be mounted under a 
> different hierarchy. This gradually become not true with unified cgroup hierarchy introduced
in kernel 3.16([The unified control group hierarchy in 3.16|https://lwn.net/Articles/601840/],
[cgroup-v2|https://github.com/torvalds/linux/blob/master/Documentation/cgroup-v2.txt|]). Also,
on some popular linux distributions, some subsystems are co-mounted within the same hierarchy
(e.g., net_cls and net_prio, cpu and cpuacct). It becomes very hard to co-manage a hierarchy
by two isolators.
> We can still introduce subsystem specific code under the unified cgroup isolator by introduce
a Subsystem abstraction. But we don't plan to support cgroup v2 in this ticket.



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