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Message-ID: <20190522175035.GB81051@jaegeuk-macbookpro.roam.corp.google.com>
Date: Wed, 22 May 2019 10:50:35 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH v2] f2fs: add missing sysfs entries in documentation
This patch cleans up documentation to cover missing sysfs entries.
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
v2 from v1:
- fix some typos and adjust suggestions
Documentation/filesystems/f2fs.txt | 89 +++++++++++++++++++++++++++---
1 file changed, 80 insertions(+), 9 deletions(-)
diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index f7b5e4ff0de3..e4139af88d78 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -246,11 +246,14 @@ Files in /sys/fs/f2fs/<devname>
..............................................................................
File Content
- gc_max_sleep_time This tuning parameter controls the maximum sleep
+ gc_urgent_sleep_time This parameter controls sleep time for gc_urgent.
+ 500 ms is set by default. See above gc_urgent.
+
+ gc_min_sleep_time This tuning parameter controls the minimum sleep
time for the garbage collection thread. Time is
in milliseconds.
- gc_min_sleep_time This tuning parameter controls the minimum sleep
+ gc_max_sleep_time This tuning parameter controls the maximum sleep
time for the garbage collection thread. Time is
in milliseconds.
@@ -270,9 +273,6 @@ Files in /sys/fs/f2fs/<devname>
to 1, background thread starts to do GC by given
gc_urgent_sleep_time interval.
- gc_urgent_sleep_time This parameter controls sleep time for gc_urgent.
- 500 ms is set by default. See above gc_urgent.
-
reclaim_segments This parameter controls the number of prefree
segments to be reclaimed. If the number of prefree
segments is larger than the number of segments
@@ -287,7 +287,16 @@ Files in /sys/fs/f2fs/<devname>
checkpoint is triggered, and issued during the
checkpoint. By default, it is disabled with 0.
- trim_sections This parameter controls the number of sections
+ discard_granularity This parameter controls the granularity of discard
+ command size. It will issue discard commands iif
+ the size is larger than given granularity. Its
+ unit size is 4KB, and 4 (=16KB) is set by default.
+ The maximum value is 128 (=512KB).
+
+ reserved_blocks This parameter indicates the number of blocks that
+ f2fs reserves internally for root.
+
+ batched_trim_sections This parameter controls the number of sections
to be trimmed out in batch mode when FITRIM
conducts. 32 sections is set by default.
@@ -309,11 +318,35 @@ Files in /sys/fs/f2fs/<devname>
the number is less than this value, it triggers
in-place-updates.
+ min_seq_blocks This parameter controls the threshold to serialize
+ write IOs issued by multiple threads in parallel.
+
+ min_hot_blocks This parameter controls the threshold to allocate
+ a hot data log for pending data blocks to write.
+
+ min_ssr_sections This parameter adds the threshold when deciding
+ SSR block allocation. If this is large, SSR mode
+ will be enabled early.
+
+ ram_thresh This parameter controls the memory footprint used
+ by free nids and cached nat entries. By default,
+ 10 is set, which indicates 10 MB / 1 GB RAM.
+
+ ra_nid_pages When building free nids, F2FS reads NAT blocks
+ ahead for speed up. Default is 0.
+
+ dirty_nats_ratio Given dirty ratio of cached nat entries, F2FS
+ determines flushing them in background.
+
max_victim_search This parameter 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.
+ migration_granularity For large-sized sections, F2FS can stop GC given
+ this granularity instead of reclaiming entire
+ section.
+
dir_level This parameter controls the directory level to
support large directory. If a directory has a
number of files, it can reduce the file lookup
@@ -321,9 +354,47 @@ Files in /sys/fs/f2fs/<devname>
Otherwise, it needs to decrease this value to
reduce the space overhead. The default value is 0.
- ram_thresh This parameter controls the memory footprint used
- by free nids and cached nat entries. By default,
- 10 is set, which indicates 10 MB / 1 GB RAM.
+ cp_interval F2FS tries to do checkpoint periodically, 60 secs
+ by default.
+
+ idle_interval F2FS detects system is idle, if there's no F2FS
+ operations during given interval, 5 secs by
+ default.
+
+ discard_idle_interval F2FS detects the discard thread is idle, given
+ time interval. Default is 5 secs.
+
+ gc_idle_interval F2FS detects the GC thread is idle, given time
+ interval. Default is 5 secs.
+
+ umount_discard_timeout When unmounting the disk, F2FS waits for finishing
+ queued discard commands which can take huge time.
+ This gives time out for it, 5 secs by default.
+
+ iostat_enable This controls to enable/disable iostat in F2FS.
+
+ readdir_ra This enables/disabled readahead of inode blocks
+ in readdir, and default is enabled.
+
+ gc_pin_file_thresh 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.
+
+ extension_list This enables to change extension_list for hot/cold
+ files in runtime.
+
+ inject_rate This controls injection rate of arbitrary faults.
+
+ inject_type This controls injection type of arbitrary faults.
+
+ dirty_segments This shows # of dirty segments.
+
+ lifetime_write_kbytes This shows # of data written to the disk.
+
+ features This shows current features enabled on F2FS.
+
+ reserved_blocks This shows # of blocks currently reserved.
================================================================================
USAGE
--
2.19.0.605.g01d371f741-goog
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