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Date: Tue, 3 Mar 2020 08:50:54 -0800 From: Shakeel Butt <shakeelb@...gle.com> To: Daniel Xu <dxu@...uu.xyz> Cc: Cgroups <cgroups@...r.kernel.org>, Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>, Johannes Weiner <hannes@...xchg.org>, LKML <linux-kernel@...r.kernel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Kernel Team <kernel-team@...com> Subject: Re: [PATCH 0/2] Support user xattrs in cgroupfs Hi Daniel, On Mon, Mar 2, 2020 at 5:42 PM Daniel Xu <dxu@...uu.xyz> wrote: > > 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". In server environments this is > less important as everyone is running as root. I would recommend removing the "everyone is running as root" statement as it is not generally true. Shakeel
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