350 lines
13 KiB
Plaintext
350 lines
13 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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gc_idle = 1 will select the Cost Benefit approach & setting
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gc_idle = 2 will select the greedy approach.
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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:
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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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0x01: F2FS_IPU_FORCE, 0x02: F2FS_IPU_SSR,
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0x04: F2FS_IPU_UTIL, 0x08: F2FS_IPU_SSR_UTIL,
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0x10: F2FS_IPU_FSYNC, 0x20: F2FS_IPU_ASYNC,
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0x40: F2FS_IPU_NOCACHE.
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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>/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>/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: Shows all enabled features in current device.
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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 agressively when set. When gc_urgent = 1,
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background thread starts to do GC by given gc_urgent_sleep_time
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interval. It is set to 0 by default.
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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 enumber 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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* REQ_META | REQ_FUA |
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* 5 | 4 | 3 | 2 | 1 | 0 |
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* Cold | Warm | Hot | Cold | Warm | Hot |
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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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* REQ_META | REQ_FUA |
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* 5 | 4 | 3 | 2 | 1 | 0 |
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* Cold | Warm | Hot | Cold | Warm | Hot |
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What: /sys/fs/f2fs/<disk>/iostat_period_ms
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Date: April 2020
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Contact: "Daeho Jeong" <daehojeong@google.com>
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Description: Give a way to change iostat_period time. 3secs by default.
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The new iostat trace gives stats gap given the period.
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