Commit 1d4c5dbb authored by Daeho Jeong's avatar Daeho Jeong Committed by Jaegeuk Kim
Browse files

f2fs: add gc_boost_gc_multiple sysfs node 



Add a sysfs knob to set a multiplier for the background GC migration
window when F2FS Garbage Collection is boosted.

Signed-off-by: default avatarDaeho Jeong <daehojeong@google.com>
Reviewed-by: default avatarChao Yu <chao@kernel.org>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 1005a3ca

Documentation/ABI/testing/sysfs-fs-f2fs

+7 −0
Original line number Diff line number Diff line
@@ -870,3 +870,10 @@ Description: This threshold is used to control triggering garbage collection whi 
		reserved section before preallocating on pinned file.

		By default, the value is ovp_sections, especially, for zoned ufs, the

		value is 1.



What:		/sys/fs/f2fs/<disk>/gc_boost_gc_multiple

Date:		June 2025

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

fs/f2fs/gc.c

+2 −1
Original line number Diff line number Diff line
@@ -197,6 +197,7 @@ 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;



	if (f2fs_sb_has_blkzoned(sbi)) {

		gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME_ZONED;
@@ -1750,7 +1751,7 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi, 
					!has_enough_free_blocks(sbi,

					sbi->gc_thread->boost_zoned_gc_percent))

				window_granularity *=

					BOOST_GC_MULTIPLE;

					sbi->gc_thread->boost_gc_multiple;



			end_segno = start_segno + window_granularity;

		}

fs/f2fs/gc.h

+1 −0
Original line number Diff line number Diff line
@@ -68,6 +68,7 @@ struct f2fs_gc_kthread { 
	unsigned int no_zoned_gc_percent;

	unsigned int boost_zoned_gc_percent;

	unsigned int valid_thresh_ratio;

	unsigned int boost_gc_multiple;

};



struct gc_inode_list {

fs/f2fs/sysfs.c

+9 −0
Original line number Diff line number Diff line
@@ -852,6 +852,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a, 
		return count;

	}



	if (!strcmp(a->attr.name, "gc_boost_gc_multiple")) {

		if (t < 1 || t > SEGS_PER_SEC(sbi))

			return -EINVAL;

		sbi->gc_thread->boost_gc_multiple = (unsigned int)t;

		return count;

	}



	*ui = (unsigned int)t;



	return count;
@@ -1078,6 +1085,7 @@ GC_THREAD_RW_ATTR(gc_no_gc_sleep_time, no_gc_sleep_time); 
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);



/* SM_INFO ATTR */

SM_INFO_RW_ATTR(reclaim_segments, rec_prefree_segments);
@@ -1249,6 +1257,7 @@ static struct attribute *f2fs_attrs[] = { 
	ATTR_LIST(gc_no_zoned_gc_percent),

	ATTR_LIST(gc_boost_zoned_gc_percent),

	ATTR_LIST(gc_valid_thresh_ratio),

	ATTR_LIST(gc_boost_gc_multiple),

	ATTR_LIST(gc_idle),

	ATTR_LIST(gc_urgent),

	ATTR_LIST(reclaim_segments),