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
 105 What:           /sys/fs/f2fs/<disk>/cp_interval
 106 Date:           October 2015
 107 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 108 Description:
 109                  Controls the checkpoint timing.
 110
 111 What:           /sys/fs/f2fs/<disk>/idle_interval
 112 Date:           January 2016
 113 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 114 Description:
 115                  Controls the idle timing.
 116
 117 What:           /sys/fs/f2fs/<disk>/iostat_enable
 118 Date:           August 2017
 119 Contact:        "Chao Yu" <yuchao0@huawei.com>
 120 Description:
 121                  Controls to enable/disable IO stat.
 122
 123 What:           /sys/fs/f2fs/<disk>/ra_nid_pages
 124 Date:           October 2015
 125 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 126 Description:
 127                  Controls the count of nid pages to be readaheaded.
 128
 129 What:           /sys/fs/f2fs/<disk>/dirty_nats_ratio
 130 Date:           January 2016
 131 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 132 Description:
 133                  Controls dirty nat entries ratio threshold, if current
 134                  ratio exceeds configured threshold, checkpoint will
 135                  be triggered for flushing dirty nat entries.
 136
 137 What:           /sys/fs/f2fs/<disk>/lifetime_write_kbytes
 138 Date:           January 2016
 139 Contact:        "Shuoran Liu" <liushuoran@huawei.com>
 140 Description:
 141                  Shows total written kbytes issued to disk.
 142
 143 What:           /sys/fs/f2fs/<disk>/feature
 144 Date:           July 2017
 145 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 146 Description:
 147                  Shows all enabled features in current device.
 148
 149 What:           /sys/fs/f2fs/<disk>/inject_rate
 150 Date:           May 2016
 151 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 152 Description:
 153                  Controls the injection rate.
 154
 155 What:           /sys/fs/f2fs/<disk>/inject_type
 156 Date:           May 2016
 157 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 158 Description:
 159                  Controls the injection type.
 160
 161 What:           /sys/fs/f2fs/<disk>/reserved_blocks
 162 Date:           June 2017
 163 Contact:        "Chao Yu" <yuchao0@huawei.com>
 164 Description:
 165                  Controls target reserved blocks in system, the threshold
 166                  is soft, it could exceed current available user space.
 167
 168 What:           /sys/fs/f2fs/<disk>/current_reserved_blocks
 169 Date:           October 2017
 170 Contact:        "Yunlong Song" <yunlong.song@huawei.com>
 171 Contact:        "Chao Yu" <yuchao0@huawei.com>
 172 Description:
 173                  Shows current reserved blocks in system, it may be temporarily
 174                  smaller than target_reserved_blocks, but will gradually
 175                  increase to target_reserved_blocks when more free blocks are
 176                  freed by user later.
 177
 178 What:           /sys/fs/f2fs/<disk>/gc_urgent
 179 Date:           August 2017
 180 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 181 Description:
 182                  Do background GC agressively
 183
 184 What:           /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
 185 Date:           August 2017
 186 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 187 Description:
 188                  Controls sleep time of GC urgent mode
 189
 190 What:           /sys/fs/f2fs/<disk>/readdir_ra
 191 Date:           November 2017
 192 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 193 Description:
 194                  Controls readahead inode block in readdir.