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Containers and /proc/sys/vm/drop_caches [message #41988]

Wed, 05 January 2011 09:40

Mike Hommey
Messages: 1
Registered: January 2011

Junior Member

[Copy/pasted from a previous message to lkml, where it was suggested to
try containers@]

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
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[Message index]

		Containers and /proc/sys/vm/drop_caches By: Mike Hommey on Wed, 05 January 2011 09:40
		Re: Containers and /proc/sys/vm/drop_caches By: Rob Landley on Fri, 07 January 2011 13:03
		Re: Containers and /proc/sys/vm/drop_caches By: Rob Landley on Sat, 08 January 2011 12:39

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