I've been prompted to take another look through the OOM killer because it
turns out it is killing tasks that have had their oom_adj set to -17 (which
is supposed to make them unkillable).
So there are a number of problems, firstly, the child and sibling thread
killing routines do not account for -17 children/siblings.
Secondly, most architecture specific pagefault handlers do a direct kill
of the current process if it takes a VM_FAULT_OOM. This is a pretty rare
thing to happen, because there isn't a lot of higher order allocations
happening, but it is not impossible. I think we can just call into the
OOM killer here, and return to userspace... but I'd like comments about
this.
Thanks,
Nick
--
SuSE Labs
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