[LU-9396] kms_shift_cb ldlm debug is too expensive

Tue, 25 Apr 2017 15:54:13 +0000

The LDLM_DEBUG debug statement in kms_shift_cb is too expensive, and under real workloads with +dlmtrace, it tends to lead to RCU stalls. Under certain loads, this debug can be called for most/all of the locks on a resource while the resource spin lock is held.

This is just too expensive, and the debug doesn't add that much. Remove it.

Whamcloud Community JIRA

[LU-9396] kms_shift_cb ldlm debug is too expensive