> On May 30, 2014, 4:17 p.m., Jie Yu wrote:
> > src/linux/cgroups.cpp, lines 454-463
> > <https://reviews.apache.org/r/21799/diff/1/?file=587746#file587746line454>
> >
> > Hum, what if the user specify '--slave_subsystems=cpu,cpuacct' on the
> > command line? IIUC, the 'prepare' function will be called twice: one for
> > 'cpu' and one for 'cpuacct', and one of them will fail?
>
> Timothy St. Clair wrote:
> Right now they already mounted by systemd, and the logic here check to
> see if they are co-mounted. This simply adds the exception to allow the case
> when:
>
> export MESOS_isolation='cgroups/cpu,cgroups/mem'
> export MESOS_hierarchy=/sys/fs/cgroup
>
> I don't think we want mesos to do the co-mounting explicitly...
>
>
>
>
> Jie Yu wrote:
> My concern here is, what if the user specify the following:
>
> export MESOS_slave_subsystems=cpu,cpuacct,memory
>
> Will the slave fail to start? More specifically, will the 'prepare' call
> for cpuacct fail because the slave cannot mount cpuacct subsystem to
> /sys/fs/cgroup/cpuacct as it is already mounted at /sys/fs/cgroup/cpu? I know
> that it won't work right now with systemd, but since you are addressing this
> issue, can you fix this as well (maybe in a difference review).
>
> Timothy St. Clair wrote:
> I'll take a look today.
So the logic for the exception is *only* in the case where it's already
co-mounted. All the existing logic holds for mounting.
if (mounted.get()) {
// Existing logic +
// don't fail on co-mount of cpu+cpuacct.
}
else {
// same mounting semantics.
}
So I think we are fine.
- Timothy
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https://reviews.apache.org/r/21799/#review44370
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On June 3, 2014, 1:39 a.m., Timothy St. Clair wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/21799/
> -----------------------------------------------------------
>
> (Updated June 3, 2014, 1:39 a.m.)
>
>
> Review request for mesos, Benjamin Hindman, Ian Downes, and Jie Yu.
>
>
> Bugs: MESOS-1195
> https://issues.apache.org/jira/browse/MESOS-1195
>
>
> Repository: mesos-git
>
>
> Description
> -------
>
> Fixes to enable cgroups to function when initialized via systemd defaults:
> + Fix for co-mounting cpu,cpuacct
> + Fix for nested cgroups_root='system.slice/mesos-slave.service'
> + Diagnostics to propagate error details.
>
>
> Diffs
> -----
>
> src/linux/cgroups.hpp 21d87a0
> src/linux/cgroups.cpp 142ac43
> src/slave/containerizer/isolators/cgroups/mem.cpp f2509ad
>
> Diff: https://reviews.apache.org/r/21799/diff/
>
>
> Testing
> -------
>
> make check
>
>
> Thanks,
>
> Timothy St. Clair
>
>
