1 What: /sys/fs/f2fs/<disk>/gc_max_sleep_time
3 Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
5 Controls the maximun sleep time for gc_thread. Time
8 What: /sys/fs/f2fs/<disk>/gc_min_sleep_time
10 Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
12 Controls the minimum sleep time for gc_thread. Time
15 What: /sys/fs/f2fs/<disk>/gc_no_gc_sleep_time
17 Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
19 Controls the default sleep time for gc_thread. Time
22 What: /sys/fs/f2fs/<disk>/gc_idle
24 Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
26 Controls the victim selection policy for garbage collection.
28 What: /sys/fs/f2fs/<disk>/reclaim_segments
30 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
32 Controls the issue rate of segment discard commands.
34 What: /sys/fs/f2fs/<disk>/ipu_policy
36 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
38 Controls the in-place-update policy.
40 What: /sys/fs/f2fs/<disk>/min_ipu_util
42 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
44 Controls the FS utilization condition for the in-place-update
47 What: /sys/fs/f2fs/<disk>/min_fsync_blocks
49 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
51 Controls the dirty page count condition for the in-place-update
54 What: /sys/fs/f2fs/<disk>/min_seq_blocks
56 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
58 Controls the dirty page count condition for batched sequential
59 writes in ->writepages.
62 What: /sys/fs/f2fs/<disk>/min_hot_blocks
64 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
66 Controls the dirty page count condition for redefining hot data.
68 What: /sys/fs/f2fs/<disk>/min_ssr_sections
70 Contact: "Chao Yu" <yuchao0@huawei.com>
72 Controls the fee section threshold to trigger SSR allocation.
74 What: /sys/fs/f2fs/<disk>/max_small_discards
76 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
78 Controls the issue rate of small discard commands.
80 What: /sys/fs/f2fs/<disk>/discard_granularity
82 Contact: "Chao Yu" <yuchao0@huawei.com>
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
89 What: /sys/fs/f2fs/<disk>/max_victim_search
91 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
93 Controls the number of trials to find a victim segment.
95 What: /sys/fs/f2fs/<disk>/dir_level
97 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
99 Controls the directory level for large directory.
101 What: /sys/fs/f2fs/<disk>/ram_thresh
103 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
105 Controls the memory footprint used by f2fs.
107 What: /sys/fs/f2fs/<disk>/batched_trim_sections
109 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
111 Controls the trimming rate in batch mode.
114 What: /sys/fs/f2fs/<disk>/cp_interval
116 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
118 Controls the checkpoint timing.
120 What: /sys/fs/f2fs/<disk>/idle_interval
122 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
124 Controls the idle timing.
126 What: /sys/fs/f2fs/<disk>/iostat_enable
128 Contact: "Chao Yu" <yuchao0@huawei.com>
130 Controls to enable/disable IO stat.
132 What: /sys/fs/f2fs/<disk>/ra_nid_pages
134 Contact: "Chao Yu" <chao2.yu@samsung.com>
136 Controls the count of nid pages to be readaheaded.
138 What: /sys/fs/f2fs/<disk>/dirty_nats_ratio
140 Contact: "Chao Yu" <chao2.yu@samsung.com>
142 Controls dirty nat entries ratio threshold, if current
143 ratio exceeds configured threshold, checkpoint will
144 be triggered for flushing dirty nat entries.
146 What: /sys/fs/f2fs/<disk>/lifetime_write_kbytes
148 Contact: "Shuoran Liu" <liushuoran@huawei.com>
150 Shows total written kbytes issued to disk.
152 What: /sys/fs/f2fs/<disk>/features
154 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
156 Shows all enabled features in current device.
158 What: /sys/fs/f2fs/<disk>/inject_rate
160 Contact: "Sheng Yong" <shengyong1@huawei.com>
162 Controls the injection rate.
164 What: /sys/fs/f2fs/<disk>/inject_type
166 Contact: "Sheng Yong" <shengyong1@huawei.com>
168 Controls the injection type.
170 What: /sys/fs/f2fs/<disk>/reserved_blocks
172 Contact: "Chao Yu" <yuchao0@huawei.com>
174 Controls target reserved blocks in system, the threshold
175 is soft, it could exceed current available user space.
177 What: /sys/fs/f2fs/<disk>/current_reserved_blocks
179 Contact: "Yunlong Song" <yunlong.song@huawei.com>
180 Contact: "Chao Yu" <yuchao0@huawei.com>
182 Shows current reserved blocks in system, it may be temporarily
183 smaller than target_reserved_blocks, but will gradually
184 increase to target_reserved_blocks when more free blocks are
187 What: /sys/fs/f2fs/<disk>/gc_urgent
189 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
191 Do background GC agressively
193 What: /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
195 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
197 Controls sleep time of GC urgent mode
199 What: /sys/fs/f2fs/<disk>/readdir_ra
201 Contact: "Sheng Yong" <shengyong1@huawei.com>
203 Controls readahead inode block in readdir.
205 What: /sys/fs/f2fs/<disk>/extension_list
207 Contact: "Chao Yu" <yuchao0@huawei.com>
209 Used to control configure extension list:
210 - Query: cat /sys/fs/f2fs/<disk>/extension_list
211 - Add: echo '[h/c]extension' > /sys/fs/f2fs/<disk>/extension_list
212 - Del: echo '[h/c]!extension' > /sys/fs/f2fs/<disk>/extension_list
213 - [h] means add/del hot file extension
214 - [c] means add/del cold file extension