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    SubjectRe: Misleading OOM messages
    * Dave Hansen <dave@linux.vnet.ibm.com> [2009-05-15 11:15:07]:

    > On Fri, 2009-05-15 at 13:57 -0400, Christoph Lameter wrote:
    > > > If you misconfigured cgroups, you give more memory to them.
    > >
    > > If you do not have enough memory in a cgroup then your application should
    > > slow down (because of page evictions) but the system should not OOM.
    > > Are cgroups broken or why are you getting OOMs when using them?
    >
    > See mm/oom_kill.c::mem_cgroup_out_of_memory(). A group itself can have
    > an OOM done on it. It's not a system-wide oom. We just need to ensure
    > that we continue to differentiate the cgroup-specific oom message from
    > the general one. Maybe also include some more cgroup info in the debug
    > outbut.
    >

    A long pending action item is to allow user space to handle cgroup
    OOM. A cgroup can OOM, if the tasks in the group is way over their limit
    and reclaim fails. I'll look to see if we enhance the output.

    --
    Balbir


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