[LU-8475] Slab allocations for target threads and session info

• Type: Improvement
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.11.0
• Labels: patch
• Assignee: WC Triage
• Reporter: Alexander Boyko

Description

lu_env cache was made to store data and minimize alloc/free calls. But it was removed, so the memory pressure much increased for vmalloc subsystem. Processing of any rpc starts from lu_env_init instead of searching.