linux-kernel - Re: [PATCH 2/3] fs: Introduce cmdline argument exceed_file_max

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Date:   Sat, 6 Jun 2020 07:13:45 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Jonathan Corbet <corbet@....net>,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH 2/3] fs: Introduce cmdline argument exceed_file_max_panic

On Sat, Jun 06, 2020 at 02:32:19PM +0800, Tiezhu Yang wrote:
> It is important to ensure that files that are opened always get closed.
> Failing to close files can result in file descriptor leaks. One common
> answer to this problem is to just raise the limit of open file handles
> and then restart the server every day or every few hours, this is not
> a good idea for long-lived servers if there is no leaks.
> 
> If there exists file descriptor leaks, when file-max limit reached, we
> can see that the system can not work well and at worst the user can do
> nothing, it is even impossible to execute reboot command due to too many
> open files in system. In order to reboot automatically to recover to the
> normal status, introduce a new cmdline argument exceed_file_max_panic for
> user to control whether to call panic in this case.

ulimit -n is your friend.