diff options
| author | Daeho Jeong <daehojeong@google.com> | 2021-08-02 21:22:45 -0700 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2021-08-03 11:16:22 -0700 |
| commit | 0f6b56ec958d49e2b3dc955cdac6b62702c04b72 (patch) | |
| tree | 7d6b246158ca89612e6004bf773fa1224a87d5ac /fs/f2fs/sysfs.c | |
| parent | 4f993264fe2965c344f223d854ccbb549b16ed71 (diff) | |
f2fs: add sysfs node to control ra_pages for fadvise seq file
fadvise() allows the user to expand the readahead window to double with
POSIX_FADV_SEQUENTIAL, now. But, in some use cases, it is not that
sufficient and we need to meet the need in a restricted way. We can
control the multiplier value of bdi device readahead between 2 (default)
and 256 for POSIX_FADV_SEQUENTIAL advise option.
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/sysfs.c')
| -rw-r--r-- | fs/f2fs/sysfs.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index f98afd9f9380..0954761341d7 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -540,6 +540,14 @@ out: return count; } + if (!strcmp(a->attr.name, "seq_file_ra_mul")) { + if (t >= MIN_RA_MUL && t <= MAX_RA_MUL) + sbi->seq_file_ra_mul = t; + else + return -EINVAL; + return count; + } + *ui = (unsigned int)t; return count; @@ -765,6 +773,7 @@ F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_candidate_count, max_candidate_cou F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_weight, age_weight); F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_threshold, age_threshold); +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, seq_file_ra_mul, seq_file_ra_mul); F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_segment_mode, gc_segment_mode); F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_reclaimed_segments, gc_reclaimed_segs); @@ -840,6 +849,7 @@ static struct attribute *f2fs_attrs[] = { ATTR_LIST(atgc_candidate_count), ATTR_LIST(atgc_age_weight), ATTR_LIST(atgc_age_threshold), + ATTR_LIST(seq_file_ra_mul), ATTR_LIST(gc_segment_mode), ATTR_LIST(gc_reclaimed_segments), NULL, |