> I wouldn't really put that at the feet of s390 (z/Architecture). Bad wording on my part. When I said s390 I meant the s390 part of the Linux kernel implementation, not the entire architecture. I meant to point out that the other parts of the kernel are working on getting out of the requirement of large contiguous buffers. AFAIK the vmcp driver uses the largest buffer and as you say, if the diag allowed to return discontiguous memory then it would solve the fragmentation problem. There are few other places that used larger buffers, NIC driver was one of them. So not sure if "all over" was the good wording either, maybe I should have said "multiple places" ;-)
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