[LU-13180] Reserve bit for RDMA-only memory RPC

• Type: New Feature
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Assignee: Wang Shilong (Inactive)
• Reporter: Wang Shilong (Inactive)

Description

This is reserved for RDMA-only memory integrated with Lustre.
The purpose of this bit is to:

1) disable short IO if memory is not directly addressable from CPU
2) prevent CPU memory pages and RDMA memory pages merging into one RPC.