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>/max_small_discards
  55 Date:           November 2013
  56 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  57 Description:
  58                  Controls the issue rate of small discard commands.
  59
  60 What:          /sys/fs/f2fs/<disk>/discard_granularity
  61 Date:          July 2017
  62 Contact:       "Chao Yu" <yuchao0@huawei.com>
  63 Description:
  64                 Controls discard granularity of inner discard thread, inner thread
  65                 will not issue discards with size that is smaller than granularity.
  66                 The unit size is one block, now only support configuring in range
  67                 of [1, 512].
  68
  69 What:           /sys/fs/f2fs/<disk>/max_victim_search
  70 Date:           January 2014
  71 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  72 Description:
  73                  Controls the number of trials to find a victim segment.
  74
  75 What:           /sys/fs/f2fs/<disk>/dir_level
  76 Date:           March 2014
  77 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  78 Description:
  79                  Controls the directory level for large directory.
  80
  81 What:           /sys/fs/f2fs/<disk>/ram_thresh
  82 Date:           March 2014
  83 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  84 Description:
  85                  Controls the memory footprint used by f2fs.
  86
  87 What:           /sys/fs/f2fs/<disk>/batched_trim_sections
  88 Date:           February 2015
  89 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  90 Description:
  91                  Controls the trimming rate in batch mode.
  92
  93 What:           /sys/fs/f2fs/<disk>/cp_interval
  94 Date:           October 2015
  95 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  96 Description:
  97                  Controls the checkpoint timing.
  98
  99 What:           /sys/fs/f2fs/<disk>/idle_interval
 100 Date:           January 2016
 101 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 102 Description:
 103                  Controls the idle timing.
 104
 105 What:           /sys/fs/f2fs/<disk>/ra_nid_pages
 106 Date:           October 2015
 107 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 108 Description:
 109                  Controls the count of nid pages to be readaheaded.
 110
 111 What:           /sys/fs/f2fs/<disk>/dirty_nats_ratio
 112 Date:           January 2016
 113 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 114 Description:
 115                  Controls dirty nat entries ratio threshold, if current
 116                  ratio exceeds configured threshold, checkpoint will
 117                  be triggered for flushing dirty nat entries.
 118
 119 What:           /sys/fs/f2fs/<disk>/lifetime_write_kbytes
 120 Date:           January 2016
 121 Contact:        "Shuoran Liu" <liushuoran@huawei.com>
 122 Description:
 123                  Shows total written kbytes issued to disk.
 124
 125 What:           /sys/fs/f2fs/<disk>/inject_rate
 126 Date:           May 2016
 127 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 128 Description:
 129                  Controls the injection rate.
 130
 131 What:           /sys/fs/f2fs/<disk>/inject_type
 132 Date:           May 2016
 133 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 134 Description:
 135                  Controls the injection type.
 136
 137 What:           /sys/fs/f2fs/<disk>/reserved_blocks
 138 Date:           June 2017
 139 Contact:        "Chao Yu" <yuchao0@huawei.com>
 140 Description:
 141                  Controls current reserved blocks in system.
 142
 143 What:           /sys/fs/f2fs/<disk>/gc_urgent
 144 Date:           August 2017
 145 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 146 Description:
 147                  Do background GC agressively
 148
 149 What:           /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
 150 Date:           August 2017
 151 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 152 Description:
 153                  Controls sleep time of GC urgent mode