f2fs: add missing sysfs entries in documentation
This patch cleans up documentation to cover missing sysfs entries. Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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Jaegeuk Kim
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040d2bb318
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4d11d13e27
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@ -246,11 +246,14 @@ Files in /sys/fs/f2fs/<devname>
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..............................................................................
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File Content
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gc_max_sleep_time This tuning parameter controls the maximum sleep
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gc_urgent_sleep_time This parameter controls sleep time for gc_urgent.
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500 ms is set by default. See above gc_urgent.
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gc_min_sleep_time This tuning parameter controls the minimum sleep
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time for the garbage collection thread. Time is
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in milliseconds.
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gc_min_sleep_time This tuning parameter controls the minimum sleep
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gc_max_sleep_time This tuning parameter controls the maximum sleep
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time for the garbage collection thread. Time is
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in milliseconds.
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@ -270,9 +273,6 @@ Files in /sys/fs/f2fs/<devname>
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to 1, background thread starts to do GC by given
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gc_urgent_sleep_time interval.
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gc_urgent_sleep_time This parameter controls sleep time for gc_urgent.
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500 ms is set by default. See above gc_urgent.
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reclaim_segments This parameter controls the number of prefree
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segments to be reclaimed. If the number of prefree
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segments is larger than the number of segments
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@ -287,7 +287,16 @@ Files in /sys/fs/f2fs/<devname>
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checkpoint is triggered, and issued during the
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checkpoint. By default, it is disabled with 0.
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trim_sections This parameter controls the number of sections
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discard_granularity This parameter controls the granularity of discard
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command size. It will issue discard commands iif
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the size is larger than given granularity. Its
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unit size is 4KB, and 4 (=16KB) is set by default.
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The maximum value is 128 (=512KB).
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reserved_blocks This parameter indicates the number of blocks that
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f2fs reserves internally for root.
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batched_trim_sections This parameter controls the number of sections
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to be trimmed out in batch mode when FITRIM
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conducts. 32 sections is set by default.
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@ -309,11 +318,35 @@ Files in /sys/fs/f2fs/<devname>
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the number is less than this value, it triggers
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in-place-updates.
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min_seq_blocks This parameter controls the threshold to serialize
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write IOs issued by multiple threads in parallel.
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min_hot_blocks This parameter controls the threshold to allocate
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a hot data log for pending data blocks to write.
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min_ssr_sections This parameter adds the threshold when deciding
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SSR block allocation. If this is large, SSR mode
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will be enabled early.
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ram_thresh This parameter controls the memory footprint used
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by free nids and cached nat entries. By default,
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10 is set, which indicates 10 MB / 1 GB RAM.
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ra_nid_pages When building free nids, F2FS reads NAT blocks
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ahead for speed up. Default is 0.
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dirty_nats_ratio Given dirty ratio of cached nat entries, F2FS
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determines flushing them in background.
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max_victim_search This parameter controls the number of trials to
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find a victim segment when conducting SSR and
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cleaning operations. The default value is 4096
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which covers 8GB block address range.
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migration_granularity For large-sized sections, F2FS can stop GC given
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this granularity instead of reclaiming entire
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section.
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dir_level This parameter controls the directory level to
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support large directory. If a directory has a
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number of files, it can reduce the file lookup
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@ -321,9 +354,47 @@ Files in /sys/fs/f2fs/<devname>
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Otherwise, it needs to decrease this value to
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reduce the space overhead. The default value is 0.
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ram_thresh This parameter controls the memory footprint used
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by free nids and cached nat entries. By default,
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10 is set, which indicates 10 MB / 1 GB RAM.
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cp_interval F2FS tries to do checkpoint periodically, 60 secs
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by default.
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idle_interval F2FS detects system is idle, if there's no F2FS
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operations during given interval, 5 secs by
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default.
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discard_idle_interval F2FS detects the discard thread is idle, given
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time interval. Default is 5 secs.
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gc_idle_interval F2FS detects the GC thread is idle, given time
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interval. Default is 5 secs.
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umount_discard_timeout When unmounting the disk, F2FS waits for finishing
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queued discard commands which can take huge time.
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This gives time out for it, 5 secs by default.
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iostat_enable This controls to enable/disable iostat in F2FS.
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readdir_ra This enables/disabled readahead of inode blocks
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in readdir, and default is enabled.
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gc_pin_file_thresh This indicates how many GC can be failed for the
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pinned file. If it exceeds this, F2FS doesn't
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guarantee its pinning state. 2048 trials is set
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by default.
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extension_list This enables to change extension_list for hot/cold
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files in runtime.
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inject_rate This controls injection rate of arbitrary faults.
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inject_type This controls injection type of arbitrary faults.
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dirty_segments This shows # of dirty segments.
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lifetime_write_kbytes This shows # of data written to the disk.
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features This shows current features enabled on F2FS.
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current_reserved_blocks This shows # of blocks currently reserved.
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================================================================================
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USAGE
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