f2fs: export migration_granularity sysfs entry
Add one sysfs entry to control migration granularity of GC in large section f2fs, it can be tuned to mitigate heavy overhead of migrating huge number of blocks in large section. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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@ -92,6 +92,15 @@ Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
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Description:
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Controls the number of trials to find a victim segment.
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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:
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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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@ -246,6 +246,11 @@ out:
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return count;
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}
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if (!strcmp(a->attr.name, "migration_granularity")) {
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if (t == 0 || t > sbi->segs_per_sec)
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return -EINVAL;
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}
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if (!strcmp(a->attr.name, "trim_sections"))
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return -EINVAL;
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@ -406,6 +411,7 @@ F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
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F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
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F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, migration_granularity, migration_granularity);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
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@ -460,6 +466,7 @@ static struct attribute *f2fs_attrs[] = {
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ATTR_LIST(min_hot_blocks),
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ATTR_LIST(min_ssr_sections),
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ATTR_LIST(max_victim_search),
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ATTR_LIST(migration_granularity),
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ATTR_LIST(dir_level),
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ATTR_LIST(ram_thresh),
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ATTR_LIST(ra_nid_pages),
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