On Thu, 2012-05-03 at 16:30 +1000, Nick Piggin wrote:
> Note that in writeback paths, a "good citizen" filesystem should not require
> any allocations, or at least it should be able to tolerate allocation failures.
> So fixing that would be a good idea anyway.

This is a good point, but UBIFS kmallocs(GFP_NOFS) when doing I/O
because it needs to compress/decompress. But I agree that if kmalloc
fails, we should have a fall-back reserve buffer protected by a mutex
for memory pressure situations.

-- 
Best Regards,
Artem Bityutskiy