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f2fs: change reclaim rate in percentage 

It is more reasonable to determine the reclaiming rate of prefree segments
according to the volume size, which is set to 5% by default.
For example, if the volume is 128GB, the prefree segments are reclaimed
when the number reaches to 6.4GB.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2014-03-19 14:17:21 +09:00
parent 9179682591
commit 58c410351e
3 changed files with 8 additions and 5 deletions
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8
Documentation/filesystems/f2fs.txt
View File

@ -169,9 +169,11 @@ Files in /sys/fs/f2fs/<devname>
reclaim_segments This parameter controls the number of prefree
segments to be reclaimed. If the number of prefree
segments is larger than this number, f2fs tries to
conduct checkpoint to reclaim the prefree segments
to free segments. By default, 100 segments, 200MB.
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.
max_small_discards This parameter controls the number of discard
commands that consist small blocks less than 2MB.

3
fs/f2fs/segment.c
View File

@ -1758,7 +1758,8 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
sm_info->ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
sm_info->rec_prefree_segments = DEF_RECLAIM_PREFREE_SEGMENTS;
sm_info->rec_prefree_segments = sm_info->main_segments *
DEF_RECLAIM_PREFREE_SEGMENTS / 100;
sm_info->ipu_policy = F2FS_IPU_DISABLE;
sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;

2
fs/f2fs/segment.h
View File

@ -14,7 +14,7 @@
#define NULL_SEGNO ((unsigned int)(~0))
#define NULL_SECNO ((unsigned int)(~0))
#define DEF_RECLAIM_PREFREE_SEGMENTS 100 /* 200MB of prefree segments */
#define DEF_RECLAIM_PREFREE_SEGMENTS 5 /* 5% over total segments */
/* L: Logical segment # in volume, R: Relative segment # in main area */
#define GET_L2R_SEGNO(free_i, segno) (segno - free_i->start_segno)