726865e69a
The description of max_small_discards is out-of-update in below two aspects, fix it. - it is disabled by default - small discards will be issued during checkpoint Signed-off-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
30 KiB
What: /sys/fs/f2fs//gc_max_sleep_time Date: July 2013 Contact: "Namjae Jeon" namjae.jeon@samsung.com Description: Controls the maximum sleep time for gc_thread. Time is in milliseconds.
What: /sys/fs/f2fs//gc_min_sleep_time Date: July 2013 Contact: "Namjae Jeon" namjae.jeon@samsung.com Description: Controls the minimum sleep time for gc_thread. Time is in milliseconds.
What: /sys/fs/f2fs//gc_no_gc_sleep_time Date: July 2013 Contact: "Namjae Jeon" namjae.jeon@samsung.com Description: Controls the default sleep time for gc_thread. Time is in milliseconds.
What: /sys/fs/f2fs//gc_idle Date: July 2013 Contact: "Namjae Jeon" namjae.jeon@samsung.com Description: Controls the victim selection policy for garbage collection. Setting gc_idle = 0(default) will disable this option. Setting:
=========== ===============================================
gc_idle = 1 will select the Cost Benefit approach & setting
gc_idle = 2 will select the greedy approach & setting
gc_idle = 3 will select the age-threshold based approach.
=========== ===============================================
What: /sys/fs/f2fs//reclaim_segments Date: October 2013 Contact: "Jaegeuk Kim" jaegeuk.kim@samsung.com Description: This parameter controls the number of prefree segments to be reclaimed. If the number of prefree segments is larger than the number of segments in the proportion to the percentage over total volume size, f2fs tries to conduct checkpoint to reclaim the prefree segments to free segments. By default, 5% over total # of segments.
What: /sys/fs/f2fs//main_blkaddr Date: November 2019 Contact: "Ramon Pantin" pantin@google.com Description: Shows first block address of MAIN area.
What: /sys/fs/f2fs//ipu_policy Date: November 2013 Contact: "Jaegeuk Kim" jaegeuk.kim@samsung.com Description: Controls the in-place-update policy. updates in f2fs. User can set:
===== =============== ===================================================
value policy description
0x00 DISABLE disable IPU(=default option in LFS mode)
0x01 FORCE all the time
0x02 SSR if SSR mode is activated
0x04 UTIL if FS utilization is over threshold
0x08 SSR_UTIL if SSR mode is activated and FS utilization is over
threshold
0x10 FSYNC activated in fsync path only for high performance
flash storages. IPU will be triggered only if the
# of dirty pages over min_fsync_blocks.
(=default option)
0x20 ASYNC do IPU given by asynchronous write requests
0x40 NOCACHE disable IPU bio cache
0x80 HONOR_OPU_WRITE use OPU write prior to IPU write if inode has
FI_OPU_WRITE flag
===== =============== ===================================================
Refer segment.h for details.
What: /sys/fs/f2fs//min_ipu_util Date: November 2013 Contact: "Jaegeuk Kim" jaegeuk.kim@samsung.com Description: Controls the FS utilization condition for the in-place-update policies. It is used by F2FS_IPU_UTIL and F2FS_IPU_SSR_UTIL policies.
What: /sys/fs/f2fs//min_fsync_blocks Date: September 2014 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Controls the dirty page count condition for the in-place-update policies.
What: /sys/fs/f2fs//min_seq_blocks Date: August 2018 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Controls the dirty page count condition for batched sequential writes in writepages.
What: /sys/fs/f2fs//min_hot_blocks Date: March 2017 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Controls the dirty page count condition for redefining hot data.
What: /sys/fs/f2fs//min_ssr_sections Date: October 2017 Contact: "Chao Yu" yuchao0@huawei.com Description: Controls the free section threshold to trigger SSR allocation. If this is large, SSR mode will be enabled early.
What: /sys/fs/f2fs//max_small_discards Date: November 2013 Contact: "Jaegeuk Kim" jaegeuk.kim@samsung.com Description: Controls the issue rate of discard commands that consist of small blocks less than 2MB. The candidates to be discarded are cached during checkpoint, and issued by issue_discard thread after checkpoint. It is enabled by default.
What: /sys/fs/f2fs//max_ordered_discard Date: October 2022 Contact: "Yangtao Li" frank.li@vivo.com Description: Controls the maximum ordered discard, the unit size is one block(4KB). Set it to 16 by default.
What: /sys/fs/f2fs//max_discard_request Date: December 2021 Contact: "Konstantin Vyshetsky" vkon@google.com Description: Controls the number of discards a thread will issue at a time. Higher number will allow the discard thread to finish its work faster, at the cost of higher latency for incoming I/O.
What: /sys/fs/f2fs//min_discard_issue_time Date: December 2021 Contact: "Konstantin Vyshetsky" vkon@google.com Description: Controls the interval the discard thread will wait between issuing discard requests when there are discards to be issued and no I/O aware interruptions occur.
What: /sys/fs/f2fs//mid_discard_issue_time Date: December 2021 Contact: "Konstantin Vyshetsky" vkon@google.com Description: Controls the interval the discard thread will wait between issuing discard requests when there are discards to be issued and an I/O aware interruption occurs.
What: /sys/fs/f2fs//max_discard_issue_time Date: December 2021 Contact: "Konstantin Vyshetsky" vkon@google.com Description: Controls the interval the discard thread will wait when there are no discard operations to be issued.
What: /sys/fs/f2fs//discard_granularity Date: July 2017 Contact: "Chao Yu" yuchao0@huawei.com Description: Controls discard granularity of inner discard thread. Inner thread will not issue discards with size that is smaller than granularity. The unit size is one block(4KB), now only support configuring in range of [1, 512]. Default value is 16. For small devices, default value is 1.
What: /sys/fs/f2fs//umount_discard_timeout Date: January 2019 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Set timeout to issue discard commands during umount. Default: 5 secs
What: /sys/fs/f2fs//pending_discard Date: November 2021 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Shows the number of pending discard commands in the queue.
What: /sys/fs/f2fs//max_victim_search Date: January 2014 Contact: "Jaegeuk Kim" jaegeuk.kim@samsung.com Description: Controls the number of trials to find a victim segment when conducting SSR and cleaning operations. The default value is 4096 which covers 8GB block address range.
What: /sys/fs/f2fs//migration_granularity Date: October 2018 Contact: "Chao Yu" yuchao0@huawei.com Description: Controls migration granularity of garbage collection on large section, it can let GC move partial segment{s} of one section in one GC cycle, so that dispersing heavy overhead GC to multiple lightweight one.
What: /sys/fs/f2fs//dir_level Date: March 2014 Contact: "Jaegeuk Kim" jaegeuk.kim@samsung.com Description: Controls the directory level for large directory. If a directory has a number of files, it can reduce the file lookup latency by increasing this dir_level value. Otherwise, it needs to decrease this value to reduce the space overhead. The default value is 0.
What: /sys/fs/f2fs//ram_thresh Date: March 2014 Contact: "Jaegeuk Kim" jaegeuk.kim@samsung.com Description: Controls the memory footprint used by free nids and cached nat entries. By default, 1 is set, which indicates 10 MB / 1 GB RAM.
What: /sys/fs/f2fs//cp_interval Date: October 2015 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Controls the checkpoint timing, set to 60 seconds by default.
What: /sys/fs/f2fs//idle_interval Date: January 2016 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Controls the idle timing of system, if there is no FS operation during given interval. Set to 5 seconds by default.
What: /sys/fs/f2fs//discard_idle_interval Date: September 2018 Contact: "Chao Yu" yuchao0@huawei.com Contact: "Sahitya Tummala" stummala@codeaurora.org Description: Controls the idle timing of discard thread given this time interval. Default is 5 secs.
What: /sys/fs/f2fs//gc_idle_interval Date: September 2018 Contact: "Chao Yu" yuchao0@huawei.com Contact: "Sahitya Tummala" stummala@codeaurora.org Description: Controls the idle timing for gc path. Set to 5 seconds by default.
What: /sys/fs/f2fs//iostat_enable Date: August 2017 Contact: "Chao Yu" yuchao0@huawei.com Description: Controls to enable/disable IO stat.
What: /sys/fs/f2fs//ra_nid_pages Date: October 2015 Contact: "Chao Yu" chao2.yu@samsung.com Description: Controls the count of nid pages to be readaheaded. When building free nids, F2FS reads NAT blocks ahead for speed up. Default is 0.
What: /sys/fs/f2fs//dirty_nats_ratio Date: January 2016 Contact: "Chao Yu" chao2.yu@samsung.com Description: Controls dirty nat entries ratio threshold, if current ratio exceeds configured threshold, checkpoint will be triggered for flushing dirty nat entries.
What: /sys/fs/f2fs//lifetime_write_kbytes Date: January 2016 Contact: "Shuoran Liu" liushuoran@huawei.com Description: Shows total written kbytes issued to disk.
What: /sys/fs/f2fs//features Date: July 2017 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: <deprecated: should use /sys/fs/f2fs//feature_list/> Shows all enabled features in current device. Supported features: encryption, blkzoned, extra_attr, projquota, inode_checksum, flexible_inline_xattr, quota_ino, inode_crtime, lost_found, verity, sb_checksum, casefold, readonly, compression, pin_file.
What: /sys/fs/f2fs//feature_list/ Date: June 2021 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Expand /sys/fs/f2fs//features to meet sysfs rule. Supported on-disk features: encryption, block_zoned (aka blkzoned), extra_attr, project_quota (aka projquota), inode_checksum, flexible_inline_xattr, quota_ino, inode_crtime, lost_found, verity, sb_checksum, casefold, readonly, compression. Note that, pin_file is moved into /sys/fs/f2fs/features/.
What: /sys/fs/f2fs/features/ Date: July 2017 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Shows all enabled kernel features. Supported features: encryption, block_zoned, extra_attr, project_quota, inode_checksum, flexible_inline_xattr, quota_ino, inode_crtime, lost_found, verity, sb_checksum, casefold, readonly, compression, test_dummy_encryption_v2, atomic_write, pin_file, encrypted_casefold.
What: /sys/fs/f2fs//inject_rate Date: May 2016 Contact: "Sheng Yong" shengyong1@huawei.com Description: Controls the injection rate of arbitrary faults.
What: /sys/fs/f2fs//inject_type Date: May 2016 Contact: "Sheng Yong" shengyong1@huawei.com Description: Controls the injection type of arbitrary faults.
What: /sys/fs/f2fs//dirty_segments Date: October 2017 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Shows the number of dirty segments.
What: /sys/fs/f2fs//reserved_blocks Date: June 2017 Contact: "Chao Yu" yuchao0@huawei.com Description: Controls target reserved blocks in system, the threshold is soft, it could exceed current available user space.
What: /sys/fs/f2fs//current_reserved_blocks Date: October 2017 Contact: "Yunlong Song" yunlong.song@huawei.com Contact: "Chao Yu" yuchao0@huawei.com Description: Shows current reserved blocks in system, it may be temporarily smaller than target_reserved_blocks, but will gradually increase to target_reserved_blocks when more free blocks are freed by user later.
What: /sys/fs/f2fs//gc_urgent Date: August 2017 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Do background GC aggressively when set. Set to 0 by default. gc urgent high(1): does GC forcibly in a period of given gc_urgent_sleep_time and ignores I/O idling check. uses greedy GC approach and turns SSR mode on. gc urgent low(2): lowers the bar of checking I/O idling in order to process outstanding discard commands and GC a little bit aggressively. uses cost benefit GC approach. gc urgent mid(3): does GC forcibly in a period of given gc_urgent_sleep_time and executes a mid level of I/O idling check. uses cost benefit GC approach.
What: /sys/fs/f2fs//gc_urgent_sleep_time Date: August 2017 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Controls sleep time of GC urgent mode. Set to 500ms by default.
What: /sys/fs/f2fs//readdir_ra Date: November 2017 Contact: "Sheng Yong" shengyong1@huawei.com Description: Controls readahead inode block in readdir. Enabled by default.
What: /sys/fs/f2fs//gc_pin_file_thresh Date: January 2018 Contact: Jaegeuk Kim jaegeuk@kernel.org Description: This indicates how many GC can be failed for the pinned file. If it exceeds this, F2FS doesn't guarantee its pinning state. 2048 trials is set by default.
What: /sys/fs/f2fs//extension_list Date: February 2018 Contact: "Chao Yu" yuchao0@huawei.com Description: Used to control configure extension list: - Query: cat /sys/fs/f2fs//extension_list - Add: echo '[h/c]extension' > /sys/fs/f2fs//extension_list - Del: echo '[h/c]!extension' > /sys/fs/f2fs//extension_list - [h] means add/del hot file extension - [c] means add/del cold file extension
What: /sys/fs/f2fs//unusable Date April 2019 Contact: "Daniel Rosenberg" drosen@google.com Description: If checkpoint=disable, it displays the number of blocks that are unusable. If checkpoint=enable it displays the number of blocks that would be unusable if checkpoint=disable were to be set.
What: /sys/fs/f2fs//encoding Date July 2019 Contact: "Daniel Rosenberg" drosen@google.com Description: Displays name and version of the encoding set for the filesystem. If no encoding is set, displays (none)
What: /sys/fs/f2fs//free_segments Date: September 2019 Contact: "Hridya Valsaraju" hridya@google.com Description: Number of free segments in disk.
What: /sys/fs/f2fs//cp_foreground_calls Date: September 2019 Contact: "Hridya Valsaraju" hridya@google.com Description: Number of checkpoint operations performed on demand. Available when CONFIG_F2FS_STAT_FS=y.
What: /sys/fs/f2fs//cp_background_calls Date: September 2019 Contact: "Hridya Valsaraju" hridya@google.com Description: Number of checkpoint operations performed in the background to free segments. Available when CONFIG_F2FS_STAT_FS=y.
What: /sys/fs/f2fs//gc_foreground_calls Date: September 2019 Contact: "Hridya Valsaraju" hridya@google.com Description: Number of garbage collection operations performed on demand. Available when CONFIG_F2FS_STAT_FS=y.
What: /sys/fs/f2fs//gc_background_calls Date: September 2019 Contact: "Hridya Valsaraju" hridya@google.com Description: Number of garbage collection operations triggered in background. Available when CONFIG_F2FS_STAT_FS=y.
What: /sys/fs/f2fs//moved_blocks_foreground Date: September 2019 Contact: "Hridya Valsaraju" hridya@google.com Description: Number of blocks moved by garbage collection in foreground. Available when CONFIG_F2FS_STAT_FS=y.
What: /sys/fs/f2fs//moved_blocks_background Date: September 2019 Contact: "Hridya Valsaraju" hridya@google.com Description: Number of blocks moved by garbage collection in background. Available when CONFIG_F2FS_STAT_FS=y.
What: /sys/fs/f2fs//avg_vblocks Date: September 2019 Contact: "Hridya Valsaraju" hridya@google.com Description: Average number of valid blocks. Available when CONFIG_F2FS_STAT_FS=y.
What: /sys/fs/f2fs//mounted_time_sec Date: February 2020 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Show the mounted time in secs of this partition.
What: /sys/fs/f2fs//data_io_flag Date: April 2020 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Give a way to attach REQ_META|FUA to data writes given temperature-based bits. Now the bits indicate:
+-------------------+-------------------+
| REQ_META | REQ_FUA |
+------+------+-----+------+------+-----+
| 5 | 4 | 3 | 2 | 1 | 0 |
+------+------+-----+------+------+-----+
| Cold | Warm | Hot | Cold | Warm | Hot |
+------+------+-----+------+------+-----+
What: /sys/fs/f2fs//node_io_flag Date: June 2020 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Give a way to attach REQ_META|FUA to node writes given temperature-based bits. Now the bits indicate:
+-------------------+-------------------+
| REQ_META | REQ_FUA |
+------+------+-----+------+------+-----+
| 5 | 4 | 3 | 2 | 1 | 0 |
+------+------+-----+------+------+-----+
| Cold | Warm | Hot | Cold | Warm | Hot |
+------+------+-----+------+------+-----+
What: /sys/fs/f2fs//iostat_period_ms Date: April 2020 Contact: "Daeho Jeong" daehojeong@google.com Description: Give a way to change iostat_period time. 3secs by default. The new iostat trace gives stats gap given the period. What: /sys/fs/f2fs//max_io_bytes Date: December 2020 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: This gives a control to limit the bio size in f2fs. Default is zero, which will follow underlying block layer limit, whereas, if it has a certain bytes value, f2fs won't submit a bio larger than that size.
What: /sys/fs/f2fs//stat/sb_status Date: December 2020 Contact: "Chao Yu" yuchao0@huawei.com Description: Show status of f2fs superblock in real time.
====== ===================== =================================
value sb status macro description
0x1 SBI_IS_DIRTY dirty flag for checkpoint
0x2 SBI_IS_CLOSE specify unmounting
0x4 SBI_NEED_FSCK need fsck.f2fs to fix
0x8 SBI_POR_DOING recovery is doing or not
0x10 SBI_NEED_SB_WRITE need to recover superblock
0x20 SBI_NEED_CP need to checkpoint
0x40 SBI_IS_SHUTDOWN shutdown by ioctl
0x80 SBI_IS_RECOVERED recovered orphan/data
0x100 SBI_CP_DISABLED CP was disabled last mount
0x200 SBI_CP_DISABLED_QUICK CP was disabled quickly
0x400 SBI_QUOTA_NEED_FLUSH need to flush quota info in CP
0x800 SBI_QUOTA_SKIP_FLUSH skip flushing quota in current CP
0x1000 SBI_QUOTA_NEED_REPAIR quota file may be corrupted
0x2000 SBI_IS_RESIZEFS resizefs is in process
0x4000 SBI_IS_FREEZING freefs is in process
====== ===================== =================================
What: /sys/fs/f2fs//stat/cp_status Date: September 2022 Contact: "Chao Yu" chao.yu@oppo.com Description: Show status of f2fs checkpoint in real time.
=============================== ==============================
cp flag value
CP_UMOUNT_FLAG 0x00000001
CP_ORPHAN_PRESENT_FLAG 0x00000002
CP_COMPACT_SUM_FLAG 0x00000004
CP_ERROR_FLAG 0x00000008
CP_FSCK_FLAG 0x00000010
CP_FASTBOOT_FLAG 0x00000020
CP_CRC_RECOVERY_FLAG 0x00000040
CP_NAT_BITS_FLAG 0x00000080
CP_TRIMMED_FLAG 0x00000100
CP_NOCRC_RECOVERY_FLAG 0x00000200
CP_LARGE_NAT_BITMAP_FLAG 0x00000400
CP_QUOTA_NEED_FSCK_FLAG 0x00000800
CP_DISABLED_FLAG 0x00001000
CP_DISABLED_QUICK_FLAG 0x00002000
CP_RESIZEFS_FLAG 0x00004000
=============================== ==============================
What: /sys/fs/f2fs//ckpt_thread_ioprio Date: January 2021 Contact: "Daeho Jeong" daehojeong@google.com Description: Give a way to change checkpoint merge daemon's io priority. Its default value is "be,3", which means "BE" I/O class and I/O priority "3". We can select the class between "rt" and "be", and set the I/O priority within valid range of it. "," delimiter is necessary in between I/O class and priority number.
What: /sys/fs/f2fs//ovp_segments Date: March 2021 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Shows the number of overprovision segments.
What: /sys/fs/f2fs//compr_written_block Date: March 2021 Contact: "Daeho Jeong" daehojeong@google.com Description: Show the block count written after compression since mount. Note that when the compressed blocks are deleted, this count doesn't decrease. If you write "0" here, you can initialize compr_written_block and compr_saved_block to "0".
What: /sys/fs/f2fs//compr_saved_block Date: March 2021 Contact: "Daeho Jeong" daehojeong@google.com Description: Show the saved block count with compression since mount. Note that when the compressed blocks are deleted, this count doesn't decrease. If you write "0" here, you can initialize compr_written_block and compr_saved_block to "0".
What: /sys/fs/f2fs//compr_new_inode Date: March 2021 Contact: "Daeho Jeong" daehojeong@google.com Description: Show the count of inode newly enabled for compression since mount. Note that when the compression is disabled for the files, this count doesn't decrease. If you write "0" here, you can initialize compr_new_inode to "0".
What: /sys/fs/f2fs//atgc_candidate_ratio Date: May 2021 Contact: "Chao Yu" yuchao0@huawei.com Description: When ATGC is on, it controls candidate ratio in order to limit total number of potential victim in all candidates, the value should be in range of [0, 100], by default it was initialized as 20(%).
What: /sys/fs/f2fs//atgc_candidate_count Date: May 2021 Contact: "Chao Yu" yuchao0@huawei.com Description: When ATGC is on, it controls candidate count in order to limit total number of potential victim in all candidates, by default it was initialized as 10 (sections).
What: /sys/fs/f2fs//atgc_age_weight Date: May 2021 Contact: "Chao Yu" yuchao0@huawei.com Description: When ATGC is on, it controls age weight to balance weight proportion in between aging and valid blocks, the value should be in range of [0, 100], by default it was initialized as 60(%).
What: /sys/fs/f2fs//atgc_age_threshold Date: May 2021 Contact: "Chao Yu" yuchao0@huawei.com Description: When ATGC is on, it controls age threshold to bypass GCing young candidates whose age is not beyond the threshold, by default it was initialized as 604800 seconds (equals to 7 days).
What: /sys/fs/f2fs//gc_reclaimed_segments Date: July 2021 Contact: "Daeho Jeong" daehojeong@google.com Description: Show how many segments have been reclaimed by GC during a specific GC mode (0: GC normal, 1: GC idle CB, 2: GC idle greedy, 3: GC idle AT, 4: GC urgent high, 5: GC urgent low 6: GC urgent mid) You can re-initialize this value to "0".
What: /sys/fs/f2fs//gc_segment_mode Date: July 2021 Contact: "Daeho Jeong" daehojeong@google.com Description: You can control for which gc mode the "gc_reclaimed_segments" node shows. Refer to the description of the modes in "gc_reclaimed_segments".
What: /sys/fs/f2fs//seq_file_ra_mul Date: July 2021 Contact: "Daeho Jeong" daehojeong@google.com Description: You can control the multiplier value of bdi device readahead window size between 2 (default) and 256 for POSIX_FADV_SEQUENTIAL advise option.
What: /sys/fs/f2fs//max_fragment_chunk Date: August 2021 Contact: "Daeho Jeong" daehojeong@google.com Description: With "mode=fragment:block" mount options, we can scatter block allocation. f2fs will allocate 1..<max_fragment_chunk> blocks in a chunk and make a hole in the length of 1..<max_fragment_hole> by turns. This value can be set between 1..512 and the default value is 4.
What: /sys/fs/f2fs//max_fragment_hole Date: August 2021 Contact: "Daeho Jeong" daehojeong@google.com Description: With "mode=fragment:block" mount options, we can scatter block allocation. f2fs will allocate 1..<max_fragment_chunk> blocks in a chunk and make a hole in the length of 1..<max_fragment_hole> by turns. This value can be set between 1..512 and the default value is 4.
What: /sys/fs/f2fs//gc_remaining_trials Date: October 2022 Contact: "Yangtao Li" frank.li@vivo.com Description: You can set the trial count limit for GC urgent and idle mode with this value. If GC thread gets to the limit, the mode will turn back to GC normal mode. By default, the value is zero, which means there is no limit like before.
What: /sys/fs/f2fs//max_roll_forward_node_blocks Date: January 2022 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Controls max # of node block writes to be used for roll forward recovery. This can limit the roll forward recovery time.
What: /sys/fs/f2fs//unusable_blocks_per_sec Date: June 2022 Contact: "Jaegeuk Kim" jaegeuk@kernel.org Description: Shows the number of unusable blocks in a section which was defined by the zone capacity reported by underlying zoned device.
What: /sys/fs/f2fs//current_atomic_write Date: July 2022 Contact: "Daeho Jeong" daehojeong@google.com Description: Show the total current atomic write block count, which is not committed yet. This is a read-only entry.
What: /sys/fs/f2fs//peak_atomic_write Date: July 2022 Contact: "Daeho Jeong" daehojeong@google.com Description: Show the peak value of total current atomic write block count after boot. If you write "0" here, you can initialize to "0".
What: /sys/fs/f2fs//committed_atomic_block Date: July 2022 Contact: "Daeho Jeong" daehojeong@google.com Description: Show the accumulated total committed atomic write block count after boot. If you write "0" here, you can initialize to "0".
What: /sys/fs/f2fs//revoked_atomic_block Date: July 2022 Contact: "Daeho Jeong" daehojeong@google.com Description: Show the accumulated total revoked atomic write block count after boot. If you write "0" here, you can initialize to "0".
What: /sys/fs/f2fs//gc_mode Date: October 2022 Contact: "Yangtao Li" frank.li@vivo.com Description: Show the current gc_mode as a string. This is a read-only entry.
What: /sys/fs/f2fs//discard_urgent_util Date: November 2022 Contact: "Yangtao Li" frank.li@vivo.com Description: When space utilization exceeds this, do background DISCARD aggressively. Does DISCARD forcibly in a period of given min_discard_issue_time when the number of discards is not 0 and set discard granularity to 1. Default: 80
What: /sys/fs/f2fs//hot_data_age_threshold Date: November 2022 Contact: "Ping Xiong" xiongping1@xiaomi.com Description: When DATA SEPARATION is on, it controls the age threshold to indicate the data blocks as hot. By default it was initialized as 262144 blocks (equals to 1GB).
What: /sys/fs/f2fs//warm_data_age_threshold
Date: November 2022
Contact: "Ping Xiong" xiongping1@xiaomi.com
Description: When DATA SEPARATION is on, it controls the age threshold to indicate
the data blocks as warm. By default it was initialized as 2621440 blocks
(equals to 10GB).
What: /sys/fs/f2fs//fault_rate Date: May 2016 Contact: "Sheng Yong" shengyong@oppo.com Contact: "Chao Yu" chao@kernel.org Description: Enable fault injection in all supported types with specified injection rate.
What: /sys/fs/f2fs//fault_type Date: May 2016 Contact: "Sheng Yong" shengyong@oppo.com Contact: "Chao Yu" chao@kernel.org Description: Support configuring fault injection type, should be enabled with fault_injection option, fault type value is shown below, it supports single or combined type.
=================== ===========
Type_Name Type_Value
=================== ===========
FAULT_KMALLOC 0x000000001
FAULT_KVMALLOC 0x000000002
FAULT_PAGE_ALLOC 0x000000004
FAULT_PAGE_GET 0x000000008
FAULT_ALLOC_BIO 0x000000010 (obsolete)
FAULT_ALLOC_NID 0x000000020
FAULT_ORPHAN 0x000000040
FAULT_BLOCK 0x000000080
FAULT_DIR_DEPTH 0x000000100
FAULT_EVICT_INODE 0x000000200
FAULT_TRUNCATE 0x000000400
FAULT_READ_IO 0x000000800
FAULT_CHECKPOINT 0x000001000
FAULT_DISCARD 0x000002000
FAULT_WRITE_IO 0x000004000
FAULT_SLAB_ALLOC 0x000008000
FAULT_DQUOT_INIT 0x000010000
FAULT_LOCK_OP 0x000020000
FAULT_BLKADDR 0x000040000
=================== ===========
What: /sys/fs/f2fs//discard_io_aware_gran Date: January 2023 Contact: "Yangtao Li" frank.li@vivo.com Description: Controls background discard granularity of inner discard thread when is not in idle. Inner thread will not issue discards with size that is smaller than granularity. The unit size is one block(4KB), now only support configuring in range of [0, 512]. Default: 512
What: /sys/fs/f2fs//last_age_weight Date: January 2023 Contact: "Ping Xiong" xiongping1@xiaomi.com Description: When DATA SEPARATION is on, it controls the weight of last data block age.
What: /sys/fs/f2fs//compress_watermark Date: February 2023 Contact: "Yangtao Li" frank.li@vivo.com Description: When compress cache is on, it controls free memory watermark in order to limit caching compress page. If free memory is lower than watermark, then deny caching compress page. The value should be in range of (0, 100], by default it was initialized as 20(%).
What: /sys/fs/f2fs//compress_percent Date: February 2023 Contact: "Yangtao Li" frank.li@vivo.com Description: When compress cache is on, it controls cached page percent(compress pages / free_ram) in order to limit caching compress page. If cached page percent exceed threshold, then deny caching compress page. The value should be in range of (0, 100], by default it was initialized as 20(%).