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From haosdent huang <haosd...@gmail.com>
Subject Re: Review Request 45363: Add `MemorySubsystem` for cgroups unified isolator.
Date Sun, 19 Jun 2016 16:24:20 GMT


> On June 15, 2016, 8:18 a.m., Qian Zhang wrote:
> > src/slave/containerizer/mesos/isolators/cgroups/subsystem.cpp, line 505
> > <https://reviews.apache.org/r/45363/diff/8/?file=1347662#file1347662line505>
> >
> >     I can see two issues here:
> >     1. `updated` is a field in subsystem level (`MemorySubsystem` class) rather
than container level (`Info` class), that means once we set it to `true` (e.g., when we update
resources for the first container), it will be `true` for all the subsequent container, I
do not think that is what we expect. Actually what we need is a flag in container level with
which we can know whether it is the first time that we update resources for this container.
I think that's the purpose of `CgroupsMemIsolatorProcess::Info::pid` in the original `cgroups/mem`
isolator.
> >     2. How to recover this `updated` field when agent is restarted? I think when
agent is restarted, this field will be always set back to `false` though it may be `true`
before agent is restarted. Actually I see the same issue in the original `cgroups/mem` isolator,
in that isolator, I do not see we recover `CgroupsMemIsolatorProcess::Info::pid` in `CgroupsMemIsolatorProcess::recover`.
So it is a bug in the `cgroups/mem` isolator?
> >     
> >     We probably need to follow the way of the `cgroups/mem` isolator (use `CgroupsMemIsolatorProcess::Info::pid`
as the flag) and recover `CgroupsMemIsolatorProcess::Info::pid` during recovery (I think we
can get pid from `ContainerState`).

For first issue, because different containers have different MemorySubsystem objects, so it
would not be an issue.


- haosdent


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On June 19, 2016, 10:31 a.m., haosdent huang wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/45363/
> -----------------------------------------------------------
> 
> (Updated June 19, 2016, 10:31 a.m.)
> 
> 
> Review request for mesos, Gilbert Song, Guangya Liu, Ian Downes, Jie Yu, Kevin Klues,
and Qian Zhang.
> 
> 
> Bugs: MESOS-5045
>     https://issues.apache.org/jira/browse/MESOS-5045
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> Add `MemorySubsystem` for cgroups unified isolator.
> 
> 
> Diffs
> -----
> 
>   src/slave/containerizer/mesos/isolators/cgroups/cgroups.cpp PRE-CREATION 
>   src/slave/containerizer/mesos/isolators/cgroups/subsystem.hpp PRE-CREATION 
>   src/slave/containerizer/mesos/isolators/cgroups/subsystem.cpp PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/45363/diff/
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> haosdent huang
> 
>


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