Re: Prevent inode/dentry trashing?

[Enrico Weigelt, metux IT consult]

On 25.06.21 17:55, Michal Koutný wrote:
> > Is it possible to prevent inode/dentry trashing for example by limiting the
> > cache per process(-group)?
>
> Yes. Unless you have disabled it with CONFIG_MEMCG_KMEM or
> cgroup.memory=nokmem, dentries and inodes are charged to respective
> cgroups. And you can limit overall memory of a cgroup, see
> memory.{max,high} attributes. (You suggest this inode/dentry consumption
> is dominant enough to affect other jobs, so the limit would keep it
> constrained as you intend).

Could you please tell a bit more how this really works ?
(maybe some pointers to the code)

I'm curios what happens if those cache objects are used by different
cgroups - are they accounted to multiple times (once per cgroup) ?
What happens when one cgroup using some cache object reaching its limit,
wile another one does not ?


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
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