Re: [PATCH] oom: Make coredump interruptible

[Roland McGrath <roland@redhat.com>]

> Because it is per-thread.

I see.

> when select_bad_process() finds the task P to kill it can participate
> in the core dump (sleep in exit_mm), but we should somehow inform the
> thread which actually dumps the core: P->mm->core_state->dumper.

Perhaps it should simply do that: if you would choose P to oom-kill, and
P->mm->core_state!=NULL, then choose P->mm->core_state->dumper instead.

> Well, we can use TIF_MEMDIE if we chose the right thread, I think.
> But perhaps mm->flags |= MMF_OOM is better, it can have other user.
> I dunno.

This is all the quick hack before get around to just making core dumping
fully-interruptible, no?  So we should go with whatever is the simplest
change now.

Perhaps this belongs in another thread as you suggested.  But I wonder what
we might get just from s/TASK_UNINTERRUPTIBLE/TASK_KILLABLE/ in exit_mm.


Thanks,
Roland