[LU-18432] Hybrid I/O statistics

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.17.0
• Severity: 3
• Assignee: Shaun Tancheff
• Reporter: Shaun Tancheff

Description

Include statistics for hybrid read/write bytes

Currently some stats are available for #of switches

# lctl get_param llite.*.stats
llite.lustre-ffff9f264675d800.stats=
snapshot_time             1731056158.535254338 secs.nsecs
...
read_bytes                97 samples [bytes] 1048576 268435456 8925478912 2377970971995799552
write_bytes               39980 samples [bytes] 77824 16777216 96074805248 1009290107703787520
hybrid_read_bytes         33 samples [bytes] 268435456 268435456 8858370048 2377900603251621888
hybrid_write_bytes        3443 samples [bytes] 16777216 16777216 57763954688 969118344814
...
hybrid_noswitch           36629 samples [reqs]
hybrid_writesize_switch   3507 samples [reqs]
hybrid_readsize_switch    33 samples [reqs]

We can add byte totals totals for hybrid bytes where read_bytes and write_bytes include the hybrid count so there is no change to current scripts collecting the data:

# lctl get_param llite.*.stats
llite.lustre-ffff9f264675d800.stats=
snapshot_time             1731056158.535254338 secs.nsecs
...
read_bytes                97 samples [bytes] 1048576 268435456 8925478912 2377970971995799552
write_bytes               39980 samples [bytes] 77824 16777216 96074805248 1009290107703787520
hybrid_read_bytes         33 samples [bytes] 268435456 268435456 8858370048 2377900603251621888
hybrid_write_bytes        3443 samples [bytes] 16777216 16777216 57763954688 969118344814
...
hybrid_noswitch           36629 samples [reqs]
hybrid_writesize_switch   3507 samples [reqs]
hybrid_readsize_switch    33 samples [reqs]