[LU-10649] yield cpu after call to ll_agl_trigger

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.0
• Severity: 3
• Assignee: Chris Horn
• Reporter: Chris Horn

Description

The statahead and agl threads loop over all entries in the
directory without yielding the CPU. If the number of entries in
the directory is large enough then these threads may trigger
soft lockups. The fix is to add calls to cond_resched() after
calling ll_agl_trigger(), which gets the glimpse lock for a
file.