f2fs: add gc_boost_gc_greedy sysfs node

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>

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index b0026d42dbe89327453360d86503580e47be7def..bc0e7fefc39d562bae413f0e28f0cfc32be4f4aa 100644 (file)
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -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

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index a9d606b11a3be67a1b06a6197207ebda042ea583..098e9f71421e2c33a3a71f4a0626d0cf6f279bdc 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -141,7 +141,7 @@ do_gc:
                                        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;

diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h
index d7573108bb68ac094a56fc9c947eec55ba201096..24e8b1c27acc4a4785a02605f97c91c1466bfd57 100644 (file)
--- a/fs/f2fs/gc.h
+++ b/fs/f2fs/gc.h
@@ -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 {

diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index d11e8af7306d129433a473d1a3a4b859309a22b1..f736052dea50acecea8ac0effce17e7510024614 100644 (file)
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -859,6 +859,13 @@ out:
                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),