linux-kernel - Re: [PATCH] Documentation/memcg: update memcg/kmem status

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150401151717.GE21839@esperanza>
Date:	Wed, 1 Apr 2015 18:17:17 +0300
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Jonathan Corbet <corbet@....net>
CC:	Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Documentation/memcg: update memcg/kmem status

On Wed, Apr 01, 2015 at 04:44:31PM +0200, Jonathan Corbet wrote:
> On Wed, 1 Apr 2015 17:30:36 +0300
> Vladimir Davydov <vdavydov@...allels.com> wrote:
> 
> > Memcg/kmem reclaim support has been finally merged. Reflect this in the
> > documentation.
> 
> So the text you've removed says not to select kmem support "unless for
> development purposes."  Do we now believe that this feature is ready for
> use in a production setting?  If the answer is "yes," I'd be happy to
> take this through the docs tree.

I added this warning because of the following issues, which made
memcg/kmem useless:

 - no reclaim support
 - lack of memcg slab caches auto destruction
 - several obvious races/bugs

They are all fixed now, so I think the answer is yes, it can be used in
production. There might be bugs that I am not aware of, of course, but
It must be safe to compile it in anyway, because memcg/kmem accounting
is disabled by default and must be enabled explicitly at runtime by
writing to cgroup/memory.kmem.limit_in_bytes.

Thanks,
Vladimir
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/