f2fs: add gc_boost_gc_greedy sysfs node

[ Upstream commit c8705cefce44fbe85ca3b180dee0e0b5f3d51dc5 ]

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>
Stable-dep-of: e462fc48ceb8 ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index e5ec2a7982eef3e6e4fcb25236d7106decdcfccc..912d6e8628081232501e6b0e14f532f77bdda339 100644 (file)
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -874,3 +874,9 @@ 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 2cc7e16f766593f96b25e466301c673e2f679122..12737dfba5efb21cf5409e77753509aadda413ec 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)
@@ -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 efa1968810a06fa469e9fb12c246fbf53aa85528..1a2e7a84b59f10687a98ff8c14eaa4d28cd8a23d 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 dce3ef405832ee5aa146fc54d73ade5889c51189..0c1e9683316e697e751adb590d4acd9d755821e6 100644 (file)
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -861,6 +861,13 @@ 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;
@@ -1088,6 +1095,7 @@ 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);
@@ -1257,6 +1265,7 @@ 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),