Subject: Re: [vserver] memory limits: where & how to mount /dev/cgroups?
From: Jarry <mr.jarry@gmail.com>
Date: Tue, 22 Nov 2011 19:34:54 +0100

On 21-Nov-11 23:01, Jean Weisbuch wrote:
> Le 21/11/2011 21:51, Jarry a écrit :
>>
>> I'm trying to set-up memory limits for my vserver-guests.
>> Documentation says "Beginning with vs2.3.0.36.29 you should
>> use cgroups to set memory limits".
>
> Here is an example (in this example we will have 1gb of memory on the
> guest and no virtual swap (soft and hard limit are the same, raise
> VDSRAMHARDLIMIT to 2048 if you want 1gb of memory + 1gb of "swap")) :
> (print in mksh is a builtin "equivalent" to echo in bash)
>
>     VDSRAMLIMIT="1024"
>     VDSRAMHARDLIMIT="1024"
>     VDSRAMLIMITBYTES="$(print -- "${VDSRAMLIMIT}*1048576" |bc)"
>     VDSRAMHARDLIMITBYTES="$(print -- "${VDSRAMHARDLIMIT}*1048576" |bc)"
>     print -- "$VDSRAMLIMITBYTES" >|
>     /etc/vservers/${xid}/cgroup/memory.limit_in_bytes
>     print -- "$VDSRAMHARDLIMITBYTES" >|
>     /etc/vservers/${xid}/cgroup/memory.memsw.limit_in_bytes
>     print -- "$VDSRAMLIMITBYTES" >| /dev/cgroup/${xid}/memory.limit_in_bytes
>     print -- "$VDSRAMHARDLIMITBYTES" >|
>     /dev/cgroup/${xid}/memory.memsw.limit_in_bytes

Thanks for help, but it still does not work for me.
1. /dev/cgroups is mounted and visible in host.
2. util-vserver version is 0.30.216_pre2910
3. I defined 512MB "soft" and 1GB "hard" limits:

host # more /etc/vservers/vs6/cgroup/memory.limit_in_bytes
536870912
host # more /etc/vservers/vs6/cgroup/memory.memsw.limit_in_bytes
1073741824
host # more /dev/cgroup/vs6/memory.limit_in_bytes
536870912
host # more /dev/cgroup/vs6/memory.memsw.limit_in_bytes
1073741824

Yet in "vs6" guest I still see the whole 16GB RAM & 50GB swap:

vs6 # free
        total        used     free     shared  buffers  cached
Mem:   16447700     426588  16021112  0       32840    38804
-/+ buffers/cache:  354944  16092756
Swap:  52428732          0  52428732


So where is the problem? What am I doing wrong?

Jarry
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