xprtrdma: MR-related memory allocation should be allowed to fail
xprtrdma always drives a retry of MR allocation if it should fail. It should be safe to not use GFP_KERNEL for this purpose rather than sleeping in the memory allocator. In theory, if these weaker allocations are attempted first, memory exhaustion is likely to cause xprtrdma to fail fast and not then invoke the RDMA core APIs, which still might use GFP_KERNEL. Also note that rpc_task_gfp_mask() always sets __GFP_NORETRY and __GFP_NOWARN when an RPC-related allocation is being done in a worker thread. MR allocation is already always done in worker threads. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Showing
Please register or sign in to comment