Hi Rami, Thanks a lot for your sequence. I followed it and it does work. I now see my process paused in sleep state instead of getting killed when the cgroup reaches OoO. This being said: * I do not really understand why the use_hierarchy option needs to be disabled in order to allow disabling of the oom killer... * I'm not sure that disabling the OoO killer is safe/reliable enough: in some of the trials I made, I saw other processes (xterms) not part of the OoO cgroup getting completely stuck and I had to reboot my machine... Best Regards, Hedi From: Rami Rosen <roszenrami@gmail.com> To: Hedi Boufaied <hedi.boufaied@amadeus.com>, Cc: kernelnewbies <kernelnewbies@kernelnewbies.org> Date: 15/04/2014 15:39 Subject: Re: cgroups: cannot write on file memory.oom_control Hi, Hedi, This sequence works for me: echo 0 > /sys/fs/cgroup/memory/memory.use_hierarchy mkdir /sys/fs/cgroup/memory/0 Then, the following two commands changes the value of oom_kill_disable: echo 1 > /sys/fs/cgroup/memory/0/memory.oom_control echo 0 > /sys/fs/cgroup/memory/0/memory.oom_control For more info, please look for the text about enabling/disabling use_hierarchy in section 6, http://lxr.free-electrons.com/source/Documentation/cgroups/memory.txt. Regards, Rami Rosen http://ramirose.wix.com/ramirosen On Mon, Apr 14, 2014 at 12:22 PM, Hedi Boufaied <hedi.boufaied@amadeus.com> wrote:
Hi everyone,
I am working with cgroups on OpenSuse (over VirtualBox) and I cannot disable the OOM killer by writing to the file memory.oom_control:
echo 1 > memory.oom_control -bash: echo: write error: Invalid argument
I can change the memory limit and several other settings by writing to the appropriate files (like memory.limit_in_bytes) but I could never write to file memory.oom_control although I am root.
I saw someone posted a similar issue a few days ago but there was no reply...
I have copied below the sequence of command I am using. Any idea what could be the issue ?
Thanks in advance for your help!
Hedi
----
/sys/fs> su - root
/sys/fs> cd cgroup
/sys/fs/cgroup> cgcreate -g memory:/mygroup
/sys/fs/cgroup> cd memory/mygroup
/sys/fs/cgroup/memory/mygroup> echo 32M > memory.limit_in_bytes
/sys/fs/cgroup/memory/mygroup> cat memory.limit_in_bytes 33554432
/sys/fs/cgroup/memory/mygroup> echo 1 > memory.oom_control -bash: echo: write error: Invalid argument
/sys/fs/cgroup/memory/mygroup> cat memory.oom_control oom_kill_disable 0 under_oom 0
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