On Fri, 2 Feb 2007, Neil Brown wrote:
> md/raid doesn't cause any problems here. It preallocates enough to be
> sure that it can always make forward progress. In general the entire
> block layer from generic_make_request down can always successfully
> write a block out in a reasonable amount of time without requiring
> kmalloc to succeed (with obvious exceptions like loop and nbd which go
> back up to a higher layer).
Hmmm... I wonder if that could be generalized. A device driver could make
a reservation by increasing min_free_kbytes? Additional drivers in a
chain could make additional reservations in such a way that enough
memory is set aside for the worst case?
> The network stack is of course a different (much harder) problem.
An NFS solution is possible without solving the network stack issue?
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