direct-io: separate fields only used in the submission path from struct dio
This large, but largely mechanic, patch moves all fields in struct dio that are only used in the submission path into a separate on stack data structure. This has the advantage that the memory is very likely cache hot, which is not guaranteed for memory fresh out of kmalloc. This also gives gcc more optimization potential because it can easier determine that there are no external aliases for these variables. The sdio initialization is a initialization now instead of memset. This allows gcc to break sdio into individual fields and optimize away unnecessary zeroing (after all the functions are inlined) Signed-off-by:Andi Kleen <ak@linux.intel.com> Acked-by:
Jeff Moyer <jmoyer@redhat.com> Signed-off-by:
Christoph Hellwig <hch@lst.de>
parent
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