linux-kernel - Re: in.tftpd - ulimit -u not working? cgroups?

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Message-ID: <20130313153758.GB13959@dhcp22.suse.cz>
Date:	Wed, 13 Mar 2013 16:37:58 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>
Cc:	linux-kernel mlist <linux-kernel@...r.kernel.org>,
	cgroups mailinglist <cgroups@...r.kernel.org>
Subject: Re: in.tftpd - ulimit -u not working? cgroups?

On Mon 11-03-13 15:47:37, Nikola Ciprich wrote:
[...]
> I also tried limiting memory using cgroups, but even with limit of
> 2MB, it can spawn much more processes than I'd like, and 1MB is too
> low... 

If you were using memory cgroup then be aware that the controller covers
only user space allocations by default which doesn't prevent forks from
creating new processes.

> Is it possible to limit number of processes using cgroups?

You might be interested in KMEM (CONFIG_MEMCG_KMEM) extension for memory
cgroup (see Documentation/cgroups/memory.txt "2.7 Kernel Memory Extension
(CONFIG_MEMCG_KMEM)" for more information)
-- 
Michal Hocko
SUSE Labs
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