OnePlus3T:/ # cat /sys/kernel/debug/f2fs/status

=====[ partition info(sda15). #0, RW]=====
[SB: 1] [CP: 2] [SIT: 6] [NAT: 114] [SSA: 113] [MAIN: 57732(OverProv:684 Resv:346)]

Utilization: 53% (15763737 valid blocks, 9846081 discard blocks)
  - Node: 481738 (Inode: 470513, Other: 11225)
  - Data: 15281999
  - Inline_xattr Inode: 125693
  - Inline_data Inode: 23320
  - Inline_dentry Inode: 21367
  - Orphan/Append/Update Inode: 3, 0, 0

Main area: 57732 segs, 57732 secs 57732 zones
  - COLD  data: 29015, 29015, 29015
  - WARM  data: 29004, 29004, 29004
  - HOT   data: 233, 233, 233
  - Dir   dnode: 137, 137, 137
  - File   dnode: 242, 242, 242
  - Indir nodes: 1272, 1272, 1272

  - Valid: 28054
  - Dirty: 3989
  - Prefree: 0
  - Free: 25689 (25689)

CP calls: 5159 (BG: 162)
GC calls: 7490 (BG: 7490)
  - data segments : 6262 (6262)
  - node segments : 1228 (1228)
Try to move 936015 blocks (BG: 936015)
  - data blocks : 825447 (825447)
  - node blocks : 110568 (110568)

Extent Cache:
  - Hit Count: L1-1:1352673 L1-2:17186 L2:439
  - Hit Ratio: 46% (1370298 / 2933257)
  - Inner Struct Count: tree: 103724(0), node: 47

Balancing F2FS Async:
  - IO (CP:    0, Data:    0, Flush: (   0 77585), Discard: (   0 88404)) cmd:    0 undiscard:   0
  - inmem:    0, atomic IO:    0 (Max.    0), volatile IO:    0 (Max.    0)
  - nodes:    4 in 89649
  - dents:    0 in dirs:   0 (   0)
  - datas:    0 in files:   0
  - meta:    0 in 2878
  - imeta:    0
  - NATs:         9/    36208
  - SITs:         1/    57732
  - free_nids:       746/ 12796973
  - alloc_nids:         0

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

IPU: 191279 blocks
SSR: 0 blocks in 0 segments
LFS: 1759993 blocks in 3437 segments

BDF: 97, avg. vblocks: 288

Memory: 392638 KB
  - static: 14887 KB
  - cached: 7643 KB
  - paged : 370108 KB