uml: send pointers instead of structures to I/O thread
Instead of writing entire structures between UML and the I/O thread, we send pointers. This cuts down on the amount of data being copied and possibly allows more requests to be pending between the two. This requires that the requests be kmalloced and freed instead of living on the stack. Signed-off-by: NJeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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