Re: [PATCH v7 01/10] memcg: enable accounting for mnt_cache entries

[Christian Brauner]

On Tue, Jul 27, 2021 at 08:33:12AM +0300, Vasily Averin wrote:
> The kernel allocates ~400 bytes of 'strcut mount' for any new mount.
> Creating a new mount namespace clones most of the parent mounts,
> and this can be repeated many times. Additionally, each mount allocates
> up to PATH_MAX=4096 bytes for mnt->mnt_devname.
> 
> It makes sense to account for these allocations to restrict the host's
> memory consumption from inside the memcg-limited container.
> 
> Signed-off-by: Vasily Averin <vvs@xxxxxxxxxxxxx>
> ---

Looks good. Thank you!
Acked-by: Christian Brauner <christian.brauner@xxxxxxxxxx>

I wonder how much this increases reported memory consumption when you
boot full system containers that run systemd and a bunch of systemd
services that each use a separate mount namespace.