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From: Mike Hommey <mh-YmoObPS1fuhg9hUCZPvPmw@public.gmane.org>
To: containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Subject: Containers and /proc/sys/vm/drop_caches
Date: Wed, 5 Jan 2011 10:40:22 +0100	[thread overview]
Message-ID: <20110105094022.GA5366@glandium.org> (raw)

[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

             reply	other threads:[~2011-01-05  9:40 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-05  9:40 Mike Hommey [this message]
     [not found] ` <20110105094022.GA5366-YmoObPS1fuhg9hUCZPvPmw@public.gmane.org>
2011-01-05  9:49   ` Containers and /proc/sys/vm/drop_caches Daniel Lezcano
     [not found]     ` <4D243EC3.1050101-GANU6spQydw@public.gmane.org>
2011-01-05 14:01       ` Serge Hallyn
     [not found]         ` <20110105140159.GC2718-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>
2011-01-05 14:16           ` Balbir Singh
     [not found]             ` <AANLkTi=x=6gUZTxJC8LXxYNu029+firyzKqjMa6m+R-x-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-01-06 21:43               ` Matt Helsley
     [not found]                 ` <20110106214315.GJ29064-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-01-06 21:50                   ` Dave Hansen
2011-01-06 22:08                     ` Matt Helsley
     [not found]                       ` <20110106220841.GK29064-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-01-06 22:15                         ` Dave Hansen
2011-01-07 13:03                   ` Rob Landley
     [not found]                     ` <4D270F34.8080305-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-01-07 15:12                       ` Serge Hallyn
     [not found]                         ` <20110107151241.GB4962-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>
2011-01-08 12:39                           ` Rob Landley
     [not found]                             ` <4D285B03.6050708-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-01-11 16:28                               ` Serge Hallyn

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