[LU-3300] Restore missing proc information for LMT

• Type: Task
• Resolution: Unresolved
• Priority: Major
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.4.0
• Assignee: Emoly Liu
• Reporter: Christopher Morrone (Inactive)

Description

Lustre's proc seems to have had a number of regressions. LMT's ltop is no longer able to find many of the values it used to display.

In particular, brw_stats from obdfilter is gone, and does not appear to have been replaced after the OSD work. At minimum, that was used by ltop to report the number of bulk rpcs handled.

The MDS display is also missing a number of values.

We don't necessarily need to put them back exactly how they were before, but we need to export them in some way that will make them usable for folks.

It would be best to decide on interfaces before 2.4.0 is locked in.

Issue Links

• duplicates: LU-3106 create symlinks in procfs from ofd to osd
• is related to: LU-3355 proc regression testing
• is related to: LU-2396 ofd brw_stats not maintained
• is related to: LU-3296 fs/lustre/mdt/*/md_stats not showing any stats after remount
• is related to: LU-2096 name ofd device type "ofd" instead of "obdfilter"
• is related to: LU-4259 No brw_stats on ZFS