In message <Pine.LNX.4.44.0210282357450.1315-100000@localhost.localdomain> you 
write:
> > 2) This is a problem, because other tasks could be OOM killed during
> >    that period, and could also try to use this mempool.
> 
> They'll try to use the mempool, maybe some will be allowed to wait
> for their kmalloc(GFP_KERNEL) memory, and others will be PF_MEMDIEd and
> proceed to take a reserved mempool buffer, and others will be PF_MEMDIEd
> and have to wait for a reserved mempool buffer.  Which will be released
> to them in due course.  No worries there.

Oh.

You are (of course) correct.  Thankyou for your patience.  Your
solution is elegant and correct.

Feeling dimwitted,
Rusty.
--
  Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
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