OnePlus5T:/ # cat /sys/kernel/debug/f2fs/status

=====[ partition info(ffffffc1f218c100). #0, RW, CP: Good]=====
[SB: 1] [CP: 2] [SIT: 6] [NAT: 114] [SSA: 113] [MAIN: 57732(OverProv:684 Resv:346)]

Utilization: 92% (26877296 valid blocks, 2492869 discard blocks)
  - Node: 570215 (Inode: 551616, Other: 18599)
  - Data: 26307081
  - Inline_xattr Inode: 283485
  - Inline_data Inode: 71678
  - Inline_dentry Inode: 33766
  - Orphan/Append/Update Inode: 33, 21, 0

Main area: 57732 segs, 57732 secs 57732 zones
  - COLD  data: 41771, 41771, 41771
  - WARM  data: 16710, 16710, 16710
  - HOT   data: 126, 126, 126
  - Dir   dnode: 232, 232, 232
  - File   dnode: 453, 453, 453
  - Indir nodes: 511, 511, 511

  - Valid: 50924
  - Dirty: 528
  - Prefree: 101
  - Free: 6179 (6179)

CP calls: 958 (BG: 66)
GC calls: 1252 (BG: 1254)
  - data segments : 1016 (1016)
  - node segments : 234 (234)
Try to move 259300 blocks (BG: 259300)
  - data blocks : 215544 (215544)
  - node blocks : 43756 (43756)
Skipped : atomic write 0 (0)

Extent Cache:
  - Hit Count: L1-1:356159 L1-2:233107 L2:14028
  - Hit Ratio: 29% (603294 / 2059190)
  - Inner Struct Count: tree: 248156(0), node: 7204

Balancing F2FS Async:
  - IO (CP:    1, Data:   -1, Flush: (   0    0    1), Discard: (   0 40900)) cmd:    0 undiscard:   0
  - inmem:    0, atomic IO:    0 (Max.    2), volatile IO:    0 (Max.    0)
  - nodes:   16 in 155322
  - dents:    0 in dirs:   0 (   2)
  - datas:   34 in files:   0
  - quota datas:    0 in quota files:   0
  - meta:    0 in 8314
  - imeta:    1
  - NATs:         0/    45200
  - SITs:         0/    57732
  - free_nids:      1361/ 12708502
  - alloc_nids:         0

Distribution of User Blocks: [ valid | invalid | free ]
  [---------------------------------------------|-|----]

IPU: 157595 blocks
SSR: 104362 blocks in 6825 segments
LFS: 887330 blocks in 1731 segments

BDF: 99, avg. vblocks: 503

Memory: 687045 KB
  - static: 15087 KB
  - cached: 17413 KB
  - paged : 654544 KB