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

=====[ partition info(ffffffc0755f96c0). #0, RW, CP: Good]=====
[SB: 1] [CP: 2] [SIT: 6] [NAT: 114] [SSA: 113] [MAIN: 57732(OverProv:684 Resv:346)]

Utilization: 93% (27276672 valid blocks, 23124 discard blocks)
  - Node: 572498 (Inode: 553568, Other: 18930)
  - Data: 26704174
  - Inline_xattr Inode: 214368
  - Inline_data Inode: 47504
  - Inline_dentry Inode: 31026
  - Orphan/Append/Update Inode: 226, 0, 0

Main area: 57732 segs, 57732 secs 57732 zones
  - COLD  data: 50143, 50143, 50143
  - WARM  data: 16123, 16123, 16123
  - HOT   data: 707, 707, 707
  - Dir   dnode: 31, 31, 31
  - File   dnode: 409, 409, 409
  - Indir nodes: 1685, 1685, 1685

  - Valid: 51810
  - Dirty: 448
  - Prefree: 83
  - Free: 5391 (5391)

CP calls: 3143 (BG: 633)
GC calls: 4994 (BG: 5026)
  - data segments : 3944 (3944)
  - node segments : 1050 (1050)
Try to move 1289855 blocks (BG: 1289855)
  - data blocks : 989739 (989739)
  - node blocks : 300116 (300116)
Skipped : atomic write 0 (0)

Extent Cache:
  - Hit Count: L1-1:1283707 L1-2:496758 L2:27692
  - Hit Ratio: 18% (1808157 / 9629161)
  - Inner Struct Count: tree: 181796(0), node: 7931

Balancing F2FS Async:
  - IO (CP:    1, Data:   -1, Flush: (   0    0    1), Discard: (   0 129304)) cmd:    0 undiscard:   0
  - inmem:    0, atomic IO:    0 (Max.    2), volatile IO:    0 (Max.    0)
  - nodes:   12 in 66410
  - dents:    0 in dirs:   0 (   3)
  - datas:  512 in files:   0
  - quota datas:    0 in quota files:   0
  - meta:    0 in 6547
  - imeta:    2
  - NATs:         0/    26816
  - SITs:         0/    57732
  - free_nids:      1804/ 12706219
  - alloc_nids:         0

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

IPU: 477522 blocks
SSR: 278286 blocks in 24735 segments
LFS: 5160476 blocks in 10078 segments

BDF: 99, avg. vblocks: 493

Memory: 319666 KB
  - static: 15087 KB
  - cached: 12751 KB
  - paged : 291828 KB