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_hot_blocks
  55 Date:           March 2017
  56 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  57 Description:
  58                  Controls the dirty page count condition for redefining hot data.
  59
  60 What:           /sys/fs/f2fs/<disk>/min_ssr_sections
  61 Date:           October 2017
  62 Contact:        "Chao Yu" <yuchao0@huawei.com>
  63 Description:
  64                  Controls the fee section threshold to trigger SSR allocation.
  65
  66 What:           /sys/fs/f2fs/<disk>/max_small_discards
  67 Date:           November 2013
  68 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  69 Description:
  70                  Controls the issue rate of small discard commands.
  71
  72 What:          /sys/fs/f2fs/<disk>/discard_granularity
  73 Date:          July 2017
  74 Contact:       "Chao Yu" <yuchao0@huawei.com>
  75 Description:
  76                 Controls discard granularity of inner discard thread, inner thread
  77                 will not issue discards with size that is smaller than granularity.
  78                 The unit size is one block, now only support configuring in range
  79                 of [1, 512].
  80
  81 What:           /sys/fs/f2fs/<disk>/max_victim_search
  82 Date:           January 2014
  83 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  84 Description:
  85                  Controls the number of trials to find a victim segment.
  86
  87 What:           /sys/fs/f2fs/<disk>/dir_level
  88 Date:           March 2014
  89 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  90 Description:
  91                  Controls the directory level for large directory.
  92
  93 What:           /sys/fs/f2fs/<disk>/ram_thresh
  94 Date:           March 2014
  95 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  96 Description:
  97                  Controls the memory footprint used by f2fs.
  98
  99 What:           /sys/fs/f2fs/<disk>/batched_trim_sections
 100 Date:           February 2015
 101 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 102 Description:
 103                  Controls the trimming rate in batch mode.
 104                  <deprecated>
 105
 106 What:           /sys/fs/f2fs/<disk>/cp_interval
 107 Date:           October 2015
 108 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 109 Description:
 110                  Controls the checkpoint timing.
 111
 112 What:           /sys/fs/f2fs/<disk>/idle_interval
 113 Date:           January 2016
 114 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 115 Description:
 116                  Controls the idle timing.
 117
 118 What:           /sys/fs/f2fs/<disk>/iostat_enable
 119 Date:           August 2017
 120 Contact:        "Chao Yu" <yuchao0@huawei.com>
 121 Description:
 122                  Controls to enable/disable IO stat.
 123
 124 What:           /sys/fs/f2fs/<disk>/ra_nid_pages
 125 Date:           October 2015
 126 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 127 Description:
 128                  Controls the count of nid pages to be readaheaded.
 129
 130 What:           /sys/fs/f2fs/<disk>/dirty_nats_ratio
 131 Date:           January 2016
 132 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 133 Description:
 134                  Controls dirty nat entries ratio threshold, if current
 135                  ratio exceeds configured threshold, checkpoint will
 136                  be triggered for flushing dirty nat entries.
 137
 138 What:           /sys/fs/f2fs/<disk>/lifetime_write_kbytes
 139 Date:           January 2016
 140 Contact:        "Shuoran Liu" <liushuoran@huawei.com>
 141 Description:
 142                  Shows total written kbytes issued to disk.
 143
 144 What:           /sys/fs/f2fs/<disk>/features
 145 Date:           July 2017
 146 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 147 Description:
 148                  Shows all enabled features in current device.
 149
 150 What:           /sys/fs/f2fs/<disk>/inject_rate
 151 Date:           May 2016
 152 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 153 Description:
 154                  Controls the injection rate.
 155
 156 What:           /sys/fs/f2fs/<disk>/inject_type
 157 Date:           May 2016
 158 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 159 Description:
 160                  Controls the injection type.
 161
 162 What:           /sys/fs/f2fs/<disk>/reserved_blocks
 163 Date:           June 2017
 164 Contact:        "Chao Yu" <yuchao0@huawei.com>
 165 Description:
 166                  Controls target reserved blocks in system, the threshold
 167                  is soft, it could exceed current available user space.
 168
 169 What:           /sys/fs/f2fs/<disk>/current_reserved_blocks
 170 Date:           October 2017
 171 Contact:        "Yunlong Song" <yunlong.song@huawei.com>
 172 Contact:        "Chao Yu" <yuchao0@huawei.com>
 173 Description:
 174                  Shows current reserved blocks in system, it may be temporarily
 175                  smaller than target_reserved_blocks, but will gradually
 176                  increase to target_reserved_blocks when more free blocks are
 177                  freed by user later.
 178
 179 What:           /sys/fs/f2fs/<disk>/gc_urgent
 180 Date:           August 2017
 181 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 182 Description:
 183                  Do background GC agressively
 184
 185 What:           /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
 186 Date:           August 2017
 187 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 188 Description:
 189                  Controls sleep time of GC urgent mode
 190
 191 What:           /sys/fs/f2fs/<disk>/readdir_ra
 192 Date:           November 2017
 193 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 194 Description:
 195                  Controls readahead inode block in readdir.
 196
 197 What:           /sys/fs/f2fs/<disk>/extension_list
 198 Date:           Feburary 2018
 199 Contact:        "Chao Yu" <yuchao0@huawei.com>
 200 Description:
 201                  Used to control configure extension list:
 202                  - Query: cat /sys/fs/f2fs/<disk>/extension_list
 203                  - Add: echo '[h/c]extension' > /sys/fs/f2fs/<disk>/extension_list
 204                  - Del: echo '[h/c]!extension' > /sys/fs/f2fs/<disk>/extension_list
 205                  - [h] means add/del hot file extension
 206                  - [c] means add/del cold file extension