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f2fs: add gc_boost_gc_greedy sysfs node

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Add this to control GC algorithm for boost GC.

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
2025-07-28 10:04:30 -07:00
committed by Jaegeuk Kim
parent 1d4c5dbba1
commit c8705cefce
4 changed files with 18 additions and 1 deletions
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6
Documentation/ABI/testing/sysfs-fs-f2fs
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@@ -877,3 +877,9 @@ Contact: "Daeho Jeong" <daehojeong@google.com>
Description: Set a multiplier for the background GC migration window when F2FS GC is
boosted. The range should be from 1 to the segment count in a section.
Default: 5
What: /sys/fs/f2fs/<disk>/gc_boost_gc_greedy
Date: June 2025
Contact: "Daeho Jeong" <daehojeong@google.com>
Description: Control GC algorithm for boost GC. 0: cost benefit, 1: greedy
Default: 1

3
fs/f2fs/gc.c
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@@ -141,7 +141,7 @@ static int gc_thread_func(void *data)
FOREGROUND : BACKGROUND);
sync_mode = (F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC) ||
gc_control.one_time;
(gc_control.one_time && gc_th->boost_gc_greedy);
/* foreground GC was been triggered via f2fs_balance_fs() */
if (foreground && !f2fs_sb_has_blkzoned(sbi))
@@ -198,6 +198,7 @@ int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
gc_th->urgent_sleep_time = DEF_GC_THREAD_URGENT_SLEEP_TIME;
gc_th->valid_thresh_ratio = DEF_GC_THREAD_VALID_THRESH_RATIO;
gc_th->boost_gc_multiple = BOOST_GC_MULTIPLE;
gc_th->boost_gc_greedy = GC_GREEDY;
if (f2fs_sb_has_blkzoned(sbi)) {
gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME_ZONED;

1
fs/f2fs/gc.h
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@@ -69,6 +69,7 @@ struct f2fs_gc_kthread {
unsigned int boost_zoned_gc_percent;
unsigned int valid_thresh_ratio;
unsigned int boost_gc_multiple;
unsigned int boost_gc_greedy;
};
struct gc_inode_list {

9
fs/f2fs/sysfs.c
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@@ -859,6 +859,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
return count;
}
if (!strcmp(a->attr.name, "gc_boost_gc_greedy")) {
if (t > GC_GREEDY)
return -EINVAL;
sbi->gc_thread->boost_gc_greedy = (unsigned int)t;
return count;
}
*ui = (unsigned int)t;
return count;
@@ -1086,6 +1093,7 @@ GC_THREAD_RW_ATTR(gc_no_zoned_gc_percent, no_zoned_gc_percent);
GC_THREAD_RW_ATTR(gc_boost_zoned_gc_percent, boost_zoned_gc_percent);
GC_THREAD_RW_ATTR(gc_valid_thresh_ratio, valid_thresh_ratio);
GC_THREAD_RW_ATTR(gc_boost_gc_multiple, boost_gc_multiple);
GC_THREAD_RW_ATTR(gc_boost_gc_greedy, boost_gc_greedy);
/* SM_INFO ATTR */
SM_INFO_RW_ATTR(reclaim_segments, rec_prefree_segments);
@@ -1258,6 +1266,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(gc_boost_zoned_gc_percent),
ATTR_LIST(gc_valid_thresh_ratio),
ATTR_LIST(gc_boost_gc_multiple),
ATTR_LIST(gc_boost_gc_greedy),
ATTR_LIST(gc_idle),
ATTR_LIST(gc_urgent),
ATTR_LIST(reclaim_segments),