Documentation/ABI/testing/sysfs-fs-f2fs

   1 What:           /sys/fs/f2fs/<disk>/gc_max_sleep_time
   2 Date:           July 2013
   3 Contact:        "Namjae Jeon" <namjae.jeon@samsung.com>
   4 Description:
   5                  Controls the maximun sleep time for gc_thread. Time
   6                  is in milliseconds.
   7
   8 What:           /sys/fs/f2fs/<disk>/gc_min_sleep_time
   9 Date:           July 2013
  10 Contact:        "Namjae Jeon" <namjae.jeon@samsung.com>
  11 Description:
  12                  Controls the minimum sleep time for gc_thread. Time
  13                  is in milliseconds.
  14
  15 What:           /sys/fs/f2fs/<disk>/gc_no_gc_sleep_time
  16 Date:           July 2013
  17 Contact:        "Namjae Jeon" <namjae.jeon@samsung.com>
  18 Description:
  19                  Controls the default sleep time for gc_thread. Time
  20                  is in milliseconds.
  21
  22 What:           /sys/fs/f2fs/<disk>/gc_idle
  23 Date:           July 2013
  24 Contact:        "Namjae Jeon" <namjae.jeon@samsung.com>
  25 Description:
  26                  Controls the victim selection policy for garbage collection.
  27
  28 What:           /sys/fs/f2fs/<disk>/reclaim_segments
  29 Date:           October 2013
  30 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  31 Description:
  32                  Controls the issue rate of segment discard commands.
  33
  34 What:           /sys/fs/f2fs/<disk>/ipu_policy
  35 Date:           November 2013
  36 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  37 Description:
  38                  Controls the in-place-update policy.
  39
  40 What:           /sys/fs/f2fs/<disk>/min_ipu_util
  41 Date:           November 2013
  42 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  43 Description:
  44                  Controls the FS utilization condition for the in-place-update
  45                  policies.
  46
  47 What:           /sys/fs/f2fs/<disk>/min_fsync_blocks
  48 Date:           September 2014
  49 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  50 Description:
  51                  Controls the dirty page count condition for the in-place-update
  52                  policies.
  53
  54 What:           /sys/fs/f2fs/<disk>/min_seq_blocks
  55 Date:           August 2018
  56 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  57 Description:
  58                  Controls the dirty page count condition for batched sequential
  59                  writes in ->writepages.
  60
  61
  62 What:           /sys/fs/f2fs/<disk>/min_hot_blocks
  63 Date:           March 2017
  64 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  65 Description:
  66                  Controls the dirty page count condition for redefining hot data.
  67
  68 What:           /sys/fs/f2fs/<disk>/min_ssr_sections
  69 Date:           October 2017
  70 Contact:        "Chao Yu" <yuchao0@huawei.com>
  71 Description:
  72                  Controls the fee section threshold to trigger SSR allocation.
  73
  74 What:           /sys/fs/f2fs/<disk>/max_small_discards
  75 Date:           November 2013
  76 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  77 Description:
  78                  Controls the issue rate of small discard commands.
  79
  80 What:          /sys/fs/f2fs/<disk>/discard_granularity
  81 Date:          July 2017
  82 Contact:       "Chao Yu" <yuchao0@huawei.com>
  83 Description:
  84                 Controls discard granularity of inner discard thread, inner thread
  85                 will not issue discards with size that is smaller than granularity.
  86                 The unit size is one block, now only support configuring in range
  87                 of [1, 512].
  88
  89 What:           /sys/fs/f2fs/<disk>/max_victim_search
  90 Date:           January 2014
  91 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  92 Description:
  93                  Controls the number of trials to find a victim segment.
  94
  95 What:           /sys/fs/f2fs/<disk>/dir_level
  96 Date:           March 2014
  97 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  98 Description:
  99                  Controls the directory level for large directory.
 100
 101 What:           /sys/fs/f2fs/<disk>/ram_thresh
 102 Date:           March 2014
 103 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
 104 Description:
 105                  Controls the memory footprint used by f2fs.
 106
 107 What:           /sys/fs/f2fs/<disk>/batched_trim_sections
 108 Date:           February 2015
 109 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 110 Description:
 111                  Controls the trimming rate in batch mode.
 112                  <deprecated>
 113
 114 What:           /sys/fs/f2fs/<disk>/cp_interval
 115 Date:           October 2015
 116 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 117 Description:
 118                  Controls the checkpoint timing.
 119
 120 What:           /sys/fs/f2fs/<disk>/idle_interval
 121 Date:           January 2016
 122 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 123 Description:
 124                  Controls the idle timing for all paths other than
 125                  discard and gc path.
 126
 127 What:           /sys/fs/f2fs/<disk>/discard_idle_interval
 128 Date:           September 2018
 129 Contact:        "Chao Yu" <yuchao0@huawei.com>
 130 Contact:        "Sahitya Tummala" <stummala@codeaurora.org>
 131 Description:
 132                  Controls the idle timing for discard path.
 133
 134 What:           /sys/fs/f2fs/<disk>/gc_idle_interval
 135 Date:           September 2018
 136 Contact:        "Chao Yu" <yuchao0@huawei.com>
 137 Contact:        "Sahitya Tummala" <stummala@codeaurora.org>
 138 Description:
 139                  Controls the idle timing for gc path.
 140
 141 What:           /sys/fs/f2fs/<disk>/iostat_enable
 142 Date:           August 2017
 143 Contact:        "Chao Yu" <yuchao0@huawei.com>
 144 Description:
 145                  Controls to enable/disable IO stat.
 146
 147 What:           /sys/fs/f2fs/<disk>/ra_nid_pages
 148 Date:           October 2015
 149 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 150 Description:
 151                  Controls the count of nid pages to be readaheaded.
 152
 153 What:           /sys/fs/f2fs/<disk>/dirty_nats_ratio
 154 Date:           January 2016
 155 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 156 Description:
 157                  Controls dirty nat entries ratio threshold, if current
 158                  ratio exceeds configured threshold, checkpoint will
 159                  be triggered for flushing dirty nat entries.
 160
 161 What:           /sys/fs/f2fs/<disk>/lifetime_write_kbytes
 162 Date:           January 2016
 163 Contact:        "Shuoran Liu" <liushuoran@huawei.com>
 164 Description:
 165                  Shows total written kbytes issued to disk.
 166
 167 What:           /sys/fs/f2fs/<disk>/features
 168 Date:           July 2017
 169 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 170 Description:
 171                  Shows all enabled features in current device.
 172
 173 What:           /sys/fs/f2fs/<disk>/inject_rate
 174 Date:           May 2016
 175 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 176 Description:
 177                  Controls the injection rate.
 178
 179 What:           /sys/fs/f2fs/<disk>/inject_type
 180 Date:           May 2016
 181 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 182 Description:
 183                  Controls the injection type.
 184
 185 What:           /sys/fs/f2fs/<disk>/reserved_blocks
 186 Date:           June 2017
 187 Contact:        "Chao Yu" <yuchao0@huawei.com>
 188 Description:
 189                  Controls target reserved blocks in system, the threshold
 190                  is soft, it could exceed current available user space.
 191
 192 What:           /sys/fs/f2fs/<disk>/current_reserved_blocks
 193 Date:           October 2017
 194 Contact:        "Yunlong Song" <yunlong.song@huawei.com>
 195 Contact:        "Chao Yu" <yuchao0@huawei.com>
 196 Description:
 197                  Shows current reserved blocks in system, it may be temporarily
 198                  smaller than target_reserved_blocks, but will gradually
 199                  increase to target_reserved_blocks when more free blocks are
 200                  freed by user later.
 201
 202 What:           /sys/fs/f2fs/<disk>/gc_urgent
 203 Date:           August 2017
 204 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 205 Description:
 206                  Do background GC agressively
 207
 208 What:           /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
 209 Date:           August 2017
 210 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 211 Description:
 212                  Controls sleep time of GC urgent mode
 213
 214 What:           /sys/fs/f2fs/<disk>/readdir_ra
 215 Date:           November 2017
 216 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 217 Description:
 218                  Controls readahead inode block in readdir.
 219
 220 What:           /sys/fs/f2fs/<disk>/extension_list
 221 Date:           Feburary 2018
 222 Contact:        "Chao Yu" <yuchao0@huawei.com>
 223 Description:
 224                  Used to control configure extension list:
 225                  - Query: cat /sys/fs/f2fs/<disk>/extension_list
 226                  - Add: echo '[h/c]extension' > /sys/fs/f2fs/<disk>/extension_list
 227                  - Del: echo '[h/c]!extension' > /sys/fs/f2fs/<disk>/extension_list
 228                  - [h] means add/del hot file extension
 229                  - [c] means add/del cold file extension