[Devel] Re: [PATCH v2 -mmotm 1/4] cgroups: Fix race between userspace and kernelspace

[Li Zefan]

(Late reply for I just came back from a long vacation)

Kirill A. Shutemov wrote:
> eventfd are used to notify about two types of event:
>  - control file-specific, like crossing memory threshold;
>  - cgroup removing.
> 
> To understand what really happen, userspace can check if the cgroup
> still exists. To avoid race beetween userspace and kernelspace we have
> to notify userspace about cgroup removing only after rmdir of cgroup
> directory.
> 
> Signed-off-by: Kirill A. Shutemov <kirill at shutemov.name>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>

Acked-by: Li Zefan <lizf at cn.fujitsu.com>

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