[LU-12782] Convert cl_object_attr_lock to rwlock

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Assignee: Dongyang Li
• Reporter: Patrick Farrell (Inactive)

Description

Under some shared file workloads, the cl_object_attr_lock ends up 'hot'.  As suggested in an old comment, it can easily be converted to an rwlock, which is useful because it is often taken for read.