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f2fs: introduce migration_window_granularity

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We can control the scanning window granularity for GC migration. For
more frequent scanning and GC on zoned devices, we need a fine grained
control knob for it.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daeho Jeong 2024-09-09 15:19:41 -07:00 committed by Jaegeuk Kim
parent 5062b5bed4
commit 8c890c4c60
6 changed files with 41 additions and 10 deletions
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8
Documentation/ABI/testing/sysfs-fs-f2fs
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@ -783,3 +783,11 @@ Description: The zone UFS we are currently using consists of two parts:
blkzone_alloc_policy = 1 Only allow writing to sequential zones
blkzone_alloc_policy = 2 Prioritize writing to conventional zones
======================== =========================================
What: /sys/fs/f2fs/<disk>/migration_window_granularity
Date: September 2024
Contact: "Daeho Jeong" <daehojeong@google.com>
Description: Controls migration window granularity of garbage collection on large
section. it can control the scanning window granularity for GC migration
in a unit of segment, while migration_granularity controls the number
of segments which can be migrated at the same turn.

2
fs/f2fs/f2fs.h
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@ -1696,6 +1696,8 @@ struct f2fs_sb_info {
unsigned int max_victim_search;
/* migration granularity of garbage collection, unit: segment */
unsigned int migration_granularity;
/* migration window granularity of garbage collection, unit: segment */
unsigned int migration_window_granularity;
/*
* for stat information.

31
fs/f2fs/gc.c
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@ -1708,24 +1708,34 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
struct blk_plug plug;
unsigned int segno = start_segno;
unsigned int end_segno = start_segno + SEGS_PER_SEC(sbi);
unsigned int sec_end_segno;
int seg_freed = 0, migrated = 0;
unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
SUM_TYPE_DATA : SUM_TYPE_NODE;
unsigned char data_type = (type == SUM_TYPE_DATA) ? DATA : NODE;
int submitted = 0;
if (__is_large_section(sbi))
end_segno = rounddown(end_segno, SEGS_PER_SEC(sbi));
if (__is_large_section(sbi)) {
sec_end_segno = rounddown(end_segno, SEGS_PER_SEC(sbi));
/*
* zone-capacity can be less than zone-size in zoned devices,
* resulting in less than expected usable segments in the zone,
* calculate the end segno in the zone which can be garbage collected
*/
if (f2fs_sb_has_blkzoned(sbi))
end_segno -= SEGS_PER_SEC(sbi) -
/*
* zone-capacity can be less than zone-size in zoned devices,
* resulting in less than expected usable segments in the zone,
* calculate the end segno in the zone which can be garbage
* collected
*/
if (f2fs_sb_has_blkzoned(sbi))
sec_end_segno -= SEGS_PER_SEC(sbi) -
f2fs_usable_segs_in_sec(sbi, segno);
if (gc_type == BG_GC)
end_segno = start_segno +
sbi->migration_window_granularity;
if (end_segno > sec_end_segno)
end_segno = sec_end_segno;
}
sanity_check_seg_type(sbi, get_seg_entry(sbi, segno)->type);
/* readahead multi ssa blocks those have contiguous address */
@ -1803,7 +1813,8 @@ freed:
if (__is_large_section(sbi))
sbi->next_victim_seg[gc_type] =
(segno + 1 < end_segno) ? segno + 1 : NULL_SEGNO;
(segno + 1 < sec_end_segno) ?
segno + 1 : NULL_SEGNO;
skip:
f2fs_put_page(sum_page, 0);
}

1
fs/f2fs/gc.h
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@ -32,6 +32,7 @@
#define LIMIT_NO_ZONED_GC 60 /* percentage over total user space of no gc for zoned devices */
#define LIMIT_BOOST_ZONED_GC 25 /* percentage over total user space of boosted gc for zoned devices */
#define DEF_MIGRATION_WINDOW_GRANULARITY_ZONED 3
#define DEF_GC_FAILED_PINNED_FILES 2048
#define MAX_GC_FAILED_PINNED_FILES USHRT_MAX

2
fs/f2fs/super.c
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@ -3807,6 +3807,8 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
sbi->migration_granularity = SEGS_PER_SEC(sbi);
sbi->migration_window_granularity = f2fs_sb_has_blkzoned(sbi) ?
DEF_MIGRATION_WINDOW_GRANULARITY_ZONED : SEGS_PER_SEC(sbi);
sbi->seq_file_ra_mul = MIN_RA_MUL;
sbi->max_fragment_chunk = DEF_FRAGMENT_SIZE;
sbi->max_fragment_hole = DEF_FRAGMENT_SIZE;

7
fs/f2fs/sysfs.c
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@ -564,6 +564,11 @@ out:
return -EINVAL;
}
if (!strcmp(a->attr.name, "migration_window_granularity")) {
if (t == 0 || t > SEGS_PER_SEC(sbi))
return -EINVAL;
}
if (!strcmp(a->attr.name, "gc_urgent")) {
if (t == 0) {
sbi->gc_mode = GC_NORMAL;
@ -1013,6 +1018,7 @@ F2FS_SBI_RW_ATTR(gc_pin_file_thresh, gc_pin_file_threshold);
F2FS_SBI_RW_ATTR(gc_reclaimed_segments, gc_reclaimed_segs);
F2FS_SBI_GENERAL_RW_ATTR(max_victim_search);
F2FS_SBI_GENERAL_RW_ATTR(migration_granularity);
F2FS_SBI_GENERAL_RW_ATTR(migration_window_granularity);
F2FS_SBI_GENERAL_RW_ATTR(dir_level);
#ifdef CONFIG_F2FS_IOSTAT
F2FS_SBI_GENERAL_RW_ATTR(iostat_enable);
@ -1154,6 +1160,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(min_ssr_sections),
ATTR_LIST(max_victim_search),
ATTR_LIST(migration_granularity),
ATTR_LIST(migration_window_granularity),
ATTR_LIST(dir_level),
ATTR_LIST(ram_thresh),
ATTR_LIST(ra_nid_pages),