Hi Rami, Thank you for the advice. Yes, I will try using the event handler.
Best Regards, Hedi From: Rami Rosen <[email protected]> To: Hedi Boufaied <[email protected]>, Cc: kernelnewbies <[email protected]> Date: 18/04/2014 22:38 Subject: Re: cgroups: cannot write on file memory.oom_control Sent by: [email protected] Hi Hedi, Well, you can use disabling oom in conjunction with event handler. Thus, you can free memory by changing memory setting of other cgroups when an oom occurs in a specific cgroup, and avoid having an oops in that cgroup. You can see an example of using event handler in conjunction with disabling the oom killer in "Namespaces and cgroups in linux", in slides 101/102, see: http://ramirose.wix.com/ramirosen A shameless plug - I wrote this presentation of 121 slides about namespaces and cgroups. Regards, Rami Rosen בתאריך 17 באפר 2014 11:24, "Hedi Boufaied" <[email protected]> כתב: 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 <[email protected]> To: Hedi Boufaied <[email protected]>, Cc: kernelnewbies <[email protected]> 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 <[email protected]> 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 > > --- > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list [email protected] http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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