1|OnePlus3T:/sys/fs/f2fs/sda15 # 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: 63% (18505058 valid blocks, 12595155 discard blocks)
  - Node: 375901 (Inode: 224942, Other: 150959)
  - Data: 18129157
  - Inline_xattr Inode: 3053
  - Inline_data Inode: 530
  - Inline_dentry Inode: 328
  - Orphan Inode: 10

Main area: 57732 segs, 57732 secs 57732 zones
  - COLD  data: 12051, 12051, 12051
  - WARM  data: 12225, 12225, 12225
  - HOT   data: 55862, 55862, 55862
  - Dir   dnode: 41688, 41688, 41688
  - File   dnode: 55806, 55806, 55806
  - Indir nodes: 41631, 41631, 41631

  - Valid: 26777
  - Dirty: 30580
  - Prefree: 0
  - Free: 375 (375)

CP calls: 8467 (BG: 28)
GC calls: 172 (BG: 67)
  - data segments : 110 (14)
  - node segments : 62 (53)
Try to move 2601 blocks (BG: 2496)
  - data blocks : 584 (488)
  - node blocks : 2017 (2008)

Extent Cache:
  - Hit Count: L1-1:201698 L1-2:100183 L2:186243
  - Hit Ratio: 24% (488124 / 1989828)
  - Inner Struct Count: tree: 6066(0), node: 2010

Balancing F2FS Async:
  - inmem:    0, wb_cp_data:    0, wb_data:    0
  - nodes:   66 in 15913
  - dents:   38 in dirs:  35 (   2)
  - datas:    0 in files:   0
  - meta:    0 in 2497
  - imeta:    0
  - NATs:        24/    15965
  - SITs:        16/    57732
  - free_nids:      2909, alloc_nids:         0

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

IPU: 414973 blocks
SSR: 497716 blocks in 986 segments
LFS: 426465 blocks in 834 segments

BDF: 87, avg. vblocks: 102

Memory: 87914 KB
  - static: 13201 KB
  - cached: 1073 KB
  - paged : 73640 KB