637 lines
25 KiB
Plaintext
637 lines
25 KiB
Plaintext
What: /sys/fs/f2fs/<disk>/gc_max_sleep_time
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Date: July 2013
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Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
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Description: Controls the maximum sleep time for gc_thread. Time
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is in milliseconds.
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What: /sys/fs/f2fs/<disk>/gc_min_sleep_time
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Date: July 2013
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Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
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Description: Controls the minimum sleep time for gc_thread. Time
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is in milliseconds.
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What: /sys/fs/f2fs/<disk>/gc_no_gc_sleep_time
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Date: July 2013
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Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
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Description: Controls the default sleep time for gc_thread. Time
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is in milliseconds.
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What: /sys/fs/f2fs/<disk>/gc_idle
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Date: July 2013
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Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
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Description: Controls the victim selection policy for garbage collection.
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Setting gc_idle = 0(default) will disable this option. Setting:
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=========== ===============================================
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gc_idle = 1 will select the Cost Benefit approach & setting
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gc_idle = 2 will select the greedy approach & setting
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gc_idle = 3 will select the age-threshold based approach.
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=========== ===============================================
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What: /sys/fs/f2fs/<disk>/reclaim_segments
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Date: October 2013
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Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
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Description: This parameter controls the number of prefree segments to be
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reclaimed. If the number of prefree segments is larger than
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the number of segments in the proportion to the percentage
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over total volume size, f2fs tries to conduct checkpoint to
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reclaim the prefree segments to free segments.
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By default, 5% over total # of segments.
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What: /sys/fs/f2fs/<disk>/main_blkaddr
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Date: November 2019
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Contact: "Ramon Pantin" <pantin@google.com>
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Description: Shows first block address of MAIN area.
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What: /sys/fs/f2fs/<disk>/ipu_policy
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Date: November 2013
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Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
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Description: Controls the in-place-update policy.
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updates in f2fs. User can set:
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==== =================
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0x01 F2FS_IPU_FORCE
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0x02 F2FS_IPU_SSR
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0x04 F2FS_IPU_UTIL
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0x08 F2FS_IPU_SSR_UTIL
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0x10 F2FS_IPU_FSYNC
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0x20 F2FS_IPU_ASYNC
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0x40 F2FS_IPU_NOCACHE
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0x80 F2FS_IPU_HONOR_OPU_WRITE
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==== =================
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Refer segment.h for details.
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What: /sys/fs/f2fs/<disk>/min_ipu_util
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Date: November 2013
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Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
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Description: Controls the FS utilization condition for the in-place-update
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policies. It is used by F2FS_IPU_UTIL and F2FS_IPU_SSR_UTIL policies.
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What: /sys/fs/f2fs/<disk>/min_fsync_blocks
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Date: September 2014
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Controls the dirty page count condition for the in-place-update
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policies.
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What: /sys/fs/f2fs/<disk>/min_seq_blocks
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Date: August 2018
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Controls the dirty page count condition for batched sequential
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writes in writepages.
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What: /sys/fs/f2fs/<disk>/min_hot_blocks
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Date: March 2017
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Controls the dirty page count condition for redefining hot data.
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What: /sys/fs/f2fs/<disk>/min_ssr_sections
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Date: October 2017
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Contact: "Chao Yu" <yuchao0@huawei.com>
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Description: Controls the free section threshold to trigger SSR allocation.
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If this is large, SSR mode will be enabled early.
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What: /sys/fs/f2fs/<disk>/max_small_discards
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Date: November 2013
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Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
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Description: Controls the issue rate of discard commands that consist of small
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blocks less than 2MB. The candidates to be discarded are cached until
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checkpoint is triggered, and issued during the checkpoint.
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By default, it is disabled with 0.
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What: /sys/fs/f2fs/<disk>/max_discard_request
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Date: December 2021
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Contact: "Konstantin Vyshetsky" <vkon@google.com>
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Description: Controls the number of discards a thread will issue at a time.
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Higher number will allow the discard thread to finish its work
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faster, at the cost of higher latency for incomming I/O.
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What: /sys/fs/f2fs/<disk>/min_discard_issue_time
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Date: December 2021
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Contact: "Konstantin Vyshetsky" <vkon@google.com>
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Description: Controls the interval the discard thread will wait between
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issuing discard requests when there are discards to be issued and
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no I/O aware interruptions occur.
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What: /sys/fs/f2fs/<disk>/mid_discard_issue_time
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Date: December 2021
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Contact: "Konstantin Vyshetsky" <vkon@google.com>
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Description: Controls the interval the discard thread will wait between
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issuing discard requests when there are discards to be issued and
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an I/O aware interruption occurs.
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What: /sys/fs/f2fs/<disk>/max_discard_issue_time
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Date: December 2021
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Contact: "Konstantin Vyshetsky" <vkon@google.com>
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Description: Controls the interval the discard thread will wait when there are
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no discard operations to be issued.
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What: /sys/fs/f2fs/<disk>/discard_granularity
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Date: July 2017
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Contact: "Chao Yu" <yuchao0@huawei.com>
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Description: Controls discard granularity of inner discard thread. Inner thread
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will not issue discards with size that is smaller than granularity.
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The unit size is one block(4KB), now only support configuring
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in range of [1, 512]. Default value is 4(=16KB).
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What: /sys/fs/f2fs/<disk>/umount_discard_timeout
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Date: January 2019
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Set timeout to issue discard commands during umount.
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Default: 5 secs
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What: /sys/fs/f2fs/<disk>/pending_discard
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Date: November 2021
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Shows the number of pending discard commands in the queue.
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What: /sys/fs/f2fs/<disk>/max_victim_search
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Date: January 2014
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Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
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Description: Controls the number of trials to find a victim segment
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when conducting SSR and cleaning operations. The default value
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is 4096 which covers 8GB block address range.
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What: /sys/fs/f2fs/<disk>/migration_granularity
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Date: October 2018
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Contact: "Chao Yu" <yuchao0@huawei.com>
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Description: Controls migration granularity of garbage collection on large
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section, it can let GC move partial segment{s} of one section
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in one GC cycle, so that dispersing heavy overhead GC to
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multiple lightweight one.
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What: /sys/fs/f2fs/<disk>/dir_level
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Date: March 2014
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Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
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Description: Controls the directory level for large directory. If a
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directory has a number of files, it can reduce the file lookup
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latency by increasing this dir_level value. Otherwise, it
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needs to decrease this value to reduce the space overhead.
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The default value is 0.
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What: /sys/fs/f2fs/<disk>/ram_thresh
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Date: March 2014
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Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
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Description: Controls the memory footprint used by free nids and cached
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nat entries. By default, 1 is set, which indicates
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10 MB / 1 GB RAM.
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What: /sys/fs/f2fs/<disk>/batched_trim_sections
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Date: February 2015
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Controls the trimming rate in batch mode.
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<deprecated>
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What: /sys/fs/f2fs/<disk>/cp_interval
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Date: October 2015
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Controls the checkpoint timing, set to 60 seconds by default.
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What: /sys/fs/f2fs/<disk>/idle_interval
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Date: January 2016
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Controls the idle timing of system, if there is no FS operation
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during given interval.
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Set to 5 seconds by default.
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What: /sys/fs/f2fs/<disk>/discard_idle_interval
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Date: September 2018
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Contact: "Chao Yu" <yuchao0@huawei.com>
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Contact: "Sahitya Tummala" <stummala@codeaurora.org>
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Description: Controls the idle timing of discard thread given
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this time interval.
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Default is 5 secs.
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What: /sys/fs/f2fs/<disk>/gc_idle_interval
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Date: September 2018
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Contact: "Chao Yu" <yuchao0@huawei.com>
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Contact: "Sahitya Tummala" <stummala@codeaurora.org>
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Description: Controls the idle timing for gc path. Set to 5 seconds by default.
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What: /sys/fs/f2fs/<disk>/iostat_enable
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Date: August 2017
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Contact: "Chao Yu" <yuchao0@huawei.com>
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Description: Controls to enable/disable IO stat.
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What: /sys/fs/f2fs/<disk>/ra_nid_pages
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Date: October 2015
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Contact: "Chao Yu" <chao2.yu@samsung.com>
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Description: Controls the count of nid pages to be readaheaded.
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When building free nids, F2FS reads NAT blocks ahead for
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speed up. Default is 0.
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What: /sys/fs/f2fs/<disk>/dirty_nats_ratio
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Date: January 2016
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Contact: "Chao Yu" <chao2.yu@samsung.com>
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Description: Controls dirty nat entries ratio threshold, if current
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ratio exceeds configured threshold, checkpoint will
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be triggered for flushing dirty nat entries.
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What: /sys/fs/f2fs/<disk>/lifetime_write_kbytes
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Date: January 2016
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Contact: "Shuoran Liu" <liushuoran@huawei.com>
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Description: Shows total written kbytes issued to disk.
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What: /sys/fs/f2fs/<disk>/features
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Date: July 2017
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: <deprecated: should use /sys/fs/f2fs/<disk>/feature_list/
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Shows all enabled features in current device.
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Supported features:
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encryption, blkzoned, extra_attr, projquota, inode_checksum,
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flexible_inline_xattr, quota_ino, inode_crtime, lost_found,
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verity, sb_checksum, casefold, readonly, compression, pin_file.
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What: /sys/fs/f2fs/<disk>/feature_list/
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Date: June 2021
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Expand /sys/fs/f2fs/<disk>/features to meet sysfs rule.
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Supported on-disk features:
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encryption, block_zoned (aka blkzoned), extra_attr,
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project_quota (aka projquota), inode_checksum,
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flexible_inline_xattr, quota_ino, inode_crtime, lost_found,
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verity, sb_checksum, casefold, readonly, compression.
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Note that, pin_file is moved into /sys/fs/f2fs/features/.
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What: /sys/fs/f2fs/features/
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Date: July 2017
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Shows all enabled kernel features.
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Supported features:
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encryption, block_zoned, extra_attr, project_quota,
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inode_checksum, flexible_inline_xattr, quota_ino,
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inode_crtime, lost_found, verity, sb_checksum,
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casefold, readonly, compression, test_dummy_encryption_v2,
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atomic_write, pin_file, encrypted_casefold.
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What: /sys/fs/f2fs/<disk>/inject_rate
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Date: May 2016
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Contact: "Sheng Yong" <shengyong1@huawei.com>
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Description: Controls the injection rate of arbitrary faults.
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What: /sys/fs/f2fs/<disk>/inject_type
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Date: May 2016
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Contact: "Sheng Yong" <shengyong1@huawei.com>
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Description: Controls the injection type of arbitrary faults.
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What: /sys/fs/f2fs/<disk>/dirty_segments
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Date: October 2017
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Shows the number of dirty segments.
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What: /sys/fs/f2fs/<disk>/reserved_blocks
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Date: June 2017
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Contact: "Chao Yu" <yuchao0@huawei.com>
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Description: Controls target reserved blocks in system, the threshold
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is soft, it could exceed current available user space.
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What: /sys/fs/f2fs/<disk>/current_reserved_blocks
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Date: October 2017
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Contact: "Yunlong Song" <yunlong.song@huawei.com>
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Contact: "Chao Yu" <yuchao0@huawei.com>
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Description: Shows current reserved blocks in system, it may be temporarily
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smaller than target_reserved_blocks, but will gradually
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increase to target_reserved_blocks when more free blocks are
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freed by user later.
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What: /sys/fs/f2fs/<disk>/gc_urgent
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Date: August 2017
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Do background GC aggressively when set. Set to 0 by default.
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gc urgent high(1): does GC forcibly in a period of given
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gc_urgent_sleep_time and ignores I/O idling check. uses greedy
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GC approach and turns SSR mode on.
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gc urgent low(2): lowers the bar of checking I/O idling in
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order to process outstanding discard commands and GC a
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little bit aggressively. uses cost benefit GC approach.
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gc urgent mid(3): does GC forcibly in a period of given
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gc_urgent_sleep_time and executes a mid level of I/O idling check.
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uses cost benefit GC approach.
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What: /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
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Date: August 2017
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Controls sleep time of GC urgent mode. Set to 500ms by default.
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What: /sys/fs/f2fs/<disk>/readdir_ra
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Date: November 2017
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Contact: "Sheng Yong" <shengyong1@huawei.com>
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Description: Controls readahead inode block in readdir. Enabled by default.
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What: /sys/fs/f2fs/<disk>/gc_pin_file_thresh
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Date: January 2018
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Contact: Jaegeuk Kim <jaegeuk@kernel.org>
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Description: This indicates how many GC can be failed for the pinned
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file. If it exceeds this, F2FS doesn't guarantee its pinning
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state. 2048 trials is set by default.
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What: /sys/fs/f2fs/<disk>/extension_list
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Date: Feburary 2018
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Contact: "Chao Yu" <yuchao0@huawei.com>
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Description: Used to control configure extension list:
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- Query: cat /sys/fs/f2fs/<disk>/extension_list
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- Add: echo '[h/c]extension' > /sys/fs/f2fs/<disk>/extension_list
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- Del: echo '[h/c]!extension' > /sys/fs/f2fs/<disk>/extension_list
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- [h] means add/del hot file extension
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- [c] means add/del cold file extension
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What: /sys/fs/f2fs/<disk>/unusable
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Date April 2019
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Contact: "Daniel Rosenberg" <drosen@google.com>
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Description: If checkpoint=disable, it displays the number of blocks that
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are unusable.
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If checkpoint=enable it displays the number of blocks that
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would be unusable if checkpoint=disable were to be set.
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What: /sys/fs/f2fs/<disk>/encoding
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Date July 2019
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Contact: "Daniel Rosenberg" <drosen@google.com>
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Description: Displays name and version of the encoding set for the filesystem.
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If no encoding is set, displays (none)
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What: /sys/fs/f2fs/<disk>/free_segments
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Date: September 2019
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Contact: "Hridya Valsaraju" <hridya@google.com>
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Description: Number of free segments in disk.
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What: /sys/fs/f2fs/<disk>/cp_foreground_calls
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Date: September 2019
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Contact: "Hridya Valsaraju" <hridya@google.com>
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Description: Number of checkpoint operations performed on demand. Available when
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CONFIG_F2FS_STAT_FS=y.
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What: /sys/fs/f2fs/<disk>/cp_background_calls
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Date: September 2019
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Contact: "Hridya Valsaraju" <hridya@google.com>
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Description: Number of checkpoint operations performed in the background to
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free segments. Available when CONFIG_F2FS_STAT_FS=y.
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What: /sys/fs/f2fs/<disk>/gc_foreground_calls
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Date: September 2019
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Contact: "Hridya Valsaraju" <hridya@google.com>
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Description: Number of garbage collection operations performed on demand.
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Available when CONFIG_F2FS_STAT_FS=y.
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What: /sys/fs/f2fs/<disk>/gc_background_calls
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Date: September 2019
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Contact: "Hridya Valsaraju" <hridya@google.com>
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Description: Number of garbage collection operations triggered in background.
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Available when CONFIG_F2FS_STAT_FS=y.
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What: /sys/fs/f2fs/<disk>/moved_blocks_foreground
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Date: September 2019
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Contact: "Hridya Valsaraju" <hridya@google.com>
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Description: Number of blocks moved by garbage collection in foreground.
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Available when CONFIG_F2FS_STAT_FS=y.
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What: /sys/fs/f2fs/<disk>/moved_blocks_background
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Date: September 2019
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Contact: "Hridya Valsaraju" <hridya@google.com>
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Description: Number of blocks moved by garbage collection in background.
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Available when CONFIG_F2FS_STAT_FS=y.
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What: /sys/fs/f2fs/<disk>/avg_vblocks
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Date: September 2019
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Contact: "Hridya Valsaraju" <hridya@google.com>
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Description: Average number of valid blocks.
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Available when CONFIG_F2FS_STAT_FS=y.
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What: /sys/fs/f2fs/<disk>/mounted_time_sec
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Date: February 2020
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Show the mounted time in secs of this partition.
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What: /sys/fs/f2fs/<disk>/data_io_flag
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Date: April 2020
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Give a way to attach REQ_META|FUA to data writes
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given temperature-based bits. Now the bits indicate:
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+-------------------+-------------------+
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| REQ_META | REQ_FUA |
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+------+------+-----+------+------+-----+
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| 5 | 4 | 3 | 2 | 1 | 0 |
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+------+------+-----+------+------+-----+
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| Cold | Warm | Hot | Cold | Warm | Hot |
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+------+------+-----+------+------+-----+
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What: /sys/fs/f2fs/<disk>/node_io_flag
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Date: June 2020
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description: Give a way to attach REQ_META|FUA to node writes
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given temperature-based bits. Now the bits indicate:
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+-------------------+-------------------+
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| REQ_META | REQ_FUA |
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+------+------+-----+------+------+-----+
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| 5 | 4 | 3 | 2 | 1 | 0 |
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+------+------+-----+------+------+-----+
|
|
| Cold | Warm | Hot | Cold | Warm | Hot |
|
|
+------+------+-----+------+------+-----+
|
|
|
|
What: /sys/fs/f2fs/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/ovp_segments
|
|
Date: March 2021
|
|
Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
|
|
Description: Shows the number of overprovision segments.
|
|
|
|
What: /sys/fs/f2fs/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/gc_urgent_high_remaining
|
|
Date: December 2021
|
|
Contact: "Daeho Jeong" <daehojeong@google.com>
|
|
Description: You can set the trial count limit for GC urgent high 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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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/<disk>/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".
|