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>/max_victim_search
  61 Date:           January 2014
  62 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  63 Description:
  64                  Controls the number of trials to find a victim segment.
  65
  66 What:           /sys/fs/f2fs/<disk>/dir_level
  67 Date:           March 2014
  68 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  69 Description:
  70                  Controls the directory level for large directory.
  71
  72 What:           /sys/fs/f2fs/<disk>/ram_thresh
  73 Date:           March 2014
  74 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  75 Description:
  76                  Controls the memory footprint used by f2fs.
  77
  78 What:           /sys/fs/f2fs/<disk>/batched_trim_sections
  79 Date:           February 2015
  80 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  81 Description:
  82                  Controls the trimming rate in batch mode.
  83
  84 What:           /sys/fs/f2fs/<disk>/cp_interval
  85 Date:           October 2015
  86 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  87 Description:
  88                  Controls the checkpoint timing.
  89
  90 What:           /sys/fs/f2fs/<disk>/idle_interval
  91 Date:           January 2016
  92 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  93 Description:
  94                  Controls the idle timing.
  95
  96 What:           /sys/fs/f2fs/<disk>/ra_nid_pages
  97 Date:           October 2015
  98 Contact:        "Chao Yu" <chao2.yu@samsung.com>
  99 Description:
 100                  Controls the count of nid pages to be readaheaded.
 101
 102 What:           /sys/fs/f2fs/<disk>/dirty_nats_ratio
 103 Date:           January 2016
 104 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 105 Description:
 106                  Controls dirty nat entries ratio threshold, if current
 107                  ratio exceeds configured threshold, checkpoint will
 108                  be triggered for flushing dirty nat entries.
 109
 110 What:           /sys/fs/f2fs/<disk>/lifetime_write_kbytes
 111 Date:           January 2016
 112 Contact:        "Shuoran Liu" <liushuoran@huawei.com>
 113 Description:
 114                  Shows total written kbytes issued to disk.
 115
 116 What:           /sys/fs/f2fs/<disk>/inject_rate
 117 Date:           May 2016
 118 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 119 Description:
 120                  Controls the injection rate.
 121
 122 What:           /sys/fs/f2fs/<disk>/inject_type
 123 Date:           May 2016
 124 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 125 Description:
 126                  Controls the injection type.
 127
 128 What:           /sys/fs/f2fs/<disk>/reserved_blocks
 129 Date:           June 2017
 130 Contact:        "Chao Yu" <yuchao0@huawei.com>
 131 Description:
 132                  Controls current reserved blocks in system.