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Date:   Fri, 13 Mar 2020 01:00:57 +0000
From:   Chris Down <chris@chrisdown.name>
To:     Daniel Xu <dxu@dxuuu.xyz>
Cc:     cgroups@vger.kernel.org, tj@kernel.org, lizefan@huawei.com,
        hannes@cmpxchg.org, viro@zeniv.linux.org.uk, shakeelb@google.com,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        gregkh@linuxfoundation.org, kernel-team@fb.com
Subject: Re: [PATCH v3 0/4] Support user xattrs in cgroupfs
Message-ID: <20200313010057.GB24320@chrisdown.name>
References: <20200312200317.31736-1-dxu@dxuuu.xyz>
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Daniel Xu writes:
>User extended attributes are useful as metadata storage for kernfs
>consumers like cgroups. Especially in the case of cgroups, it is useful
>to have a central metadata store that multiple processes/services can
>use to coordinate actions.
>
>A concrete example is for userspace out of memory killers. We want to
>let delegated cgroup subtree owners (running as non-root) to be able to
>say "please avoid killing this cgroup". This is especially important for
>desktop linux as delegated subtrees owners are less likely to run as
>root.
>
>The first two commits set up some stuff for the third commit which
>intro introduce a new flag, KERNFS_ROOT_SUPPORT_USER_XATTR,
>that lets kernfs consumers enable user xattr support. The final commit
>turns on user xattr support for cgroupfs.

The whole series looks good to me, thanks.

For the whole series:

Acked-by: Chris Down <chris@chrisdown.name>