linux-kernel - Re: [RFC PATCH v2 1/3] misc_cgroup: add support for nofile limit

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Date:   Mon, 26 Jul 2021 11:27:25 -1000
From:   Tejun Heo <tj@...nel.org>
To:     brookxu <brookxu.cn@...il.com>
Cc:     viro@...iv.linux.org.uk, lizefan.x@...edance.com,
        hannes@...xchg.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/3] misc_cgroup: add support for nofile limit

On Thu, Jul 22, 2021 at 11:20:17PM +0800, brookxu wrote:
> From: Chunguang Xu <brookxu@...cent.com>
> 
> Since the global open files are limited, in order to avoid the
> abnormal behavior of some containers from generating too many
> files, causing other containers to be unavailable, we need to
> limit the open files of some containers.
> 
> v2: fix compile error while CONFIG_CGROUP_MISC not set.
> 
> Signed-off-by: Chunguang Xu <brookxu@...cent.com>
> Reported-by: kernel test robot <lkp@...el.com>

This is different from pid in that there's no actual limit on how many open
files there can be in the system other than the total amount of available
memory. I don't see why this would need a separate limit outside of memory
control. A couple machines I looked at all have file-max at LONG_MAX by
default too.

Thanks.

-- 
tejun