arter97@arter97-X99:~$ adb shell
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% (15760427 valid blocks, 14022463 discard blocks)
  - Node: 481688 (Inode: 470478, Other: 11210)
  - Data: 15278739
  - Inline_xattr Inode: 24193
  - Inline_data Inode: 3468
  - Inline_dentry Inode: 9312
  - Orphan/Append/Update Inode: 1, 0, 0

Main area: 57732 segs, 57732 secs 57732 zones
  - COLD  data: 25410, 25410, 25410
  - WARM  data: 26111, 26111, 26111
  - HOT   data: 2294, 2294, 2294
  - Dir   dnode: 2291, 2291, 2291
  - File   dnode: 1149, 1149, 1149
  - Indir nodes: 3800, 3800, 3800

  - Valid: 26659
  - Dirty: 10554
  - Prefree: 0
  - Free: 20519 (20519)

CP calls: 101 (BG: 0)
GC calls: 0 (BG: 0)
  - data segments : 0 (0)
  - node segments : 0 (0)
Try to move 0 blocks (BG: 0)
  - data blocks : 0 (0)
  - node blocks : 0 (0)

Extent Cache:
  - Hit Count: L1-1:12490 L1-2:4 L2:2
  - Hit Ratio: 37% (12496 / 33170)
  - Inner Struct Count: tree: 14631(0), node: 2679

Balancing F2FS Async:
  - IO (CP:    0, Data:    0, Flush: (   0 1248), Discard: (   0    0)) cmd: 1019 undiscard:24851
  - inmem:    0, atomic IO:    0 (Max.    0), volatile IO:    0 (Max.    0)
  - nodes:    6 in 24598
  - dents:    1 in dirs:   1 (  73)
  - datas:   55 in files:   0
  - meta:    0 in 1852
  - imeta:    3
  - NATs:         5/    19500
  - SITs:         4/    57732
  - free_nids:       265/ 12797025
  - alloc_nids:         0

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

IPU: 2297 blocks
SSR: 0 blocks in 0 segments
LFS: 6200 blocks in 10 segments

BDF: 92, avg. vblocks: 176

Memory: 122500 KB
  - static: 14887 KB
  - cached: 1809 KB
  - paged : 105804 KB