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Chuck Lever authored
When the maximum payload size of NFS READ and WRITE was increased by commit cc9a903d ("svcrdma: Change maximum server payload back to RPCSVC_MAXPAYLOAD"), the size of struct svc_rdma_op_ctxt increased to over 6KB (on x86_64). That makes allocating one of these from a kmem_cache more likely to fail in situations when system memory is exhausted. Since I'm about to add a caller where this allocation must always work _and_ it cannot sleep, pre-allocate ctxts for each connection. Another motivation for this change is that NFSv4.x servers are required by specification not to drop NFS requests. Pre-allocating memory resources reduces the likelihood of a drop. Signed-off-by:
Chuck Lever <chuck.lever@oracle.com> Acked-by:
Bruce Fields <bfields@fieldses.org> Signed-off-by:
Doug Ledford <dledford@redhat.com>
cc886c9f