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From: Mike Hommey <mh@glandium.org>
To: linux-kernel@vger.kernel.org
Subject: Containers and /proc/sys/vm/drop_caches
Date: Thu, 30 Dec 2010 08:59:01 +0100	[thread overview]
Message-ID: <20101230075901.GA4115@glandium.org> (raw)

Hi,

I noticed that from within a lxc container, writing "3" to
/proc/sys/vm/drop_caches would flush the host page cache. That sounds a
little dangerous for VPS offerings that would be based on lxc, as in one
VPS instance root user could impact the overall performance of the host.
I don't know about other containers but I've been told openvz isn't
subject to this problem.
I only tested the current Debian Squeeze kernel, which is based on
2.6.32.27.

Cheers,

Mike

             reply	other threads:[~2010-12-30  8:35 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-30  7:59 Mike Hommey [this message]
2010-12-30  8:57 ` Rob Landley

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