Please check
https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/log/?h=dev-test
On 07/28, Daeho Jeong wrote:
> From: Daeho Jeong <daehoje...@google.com>
>
> Add a sysfs knob to set a multiplier for the background GC migration
> window when F2FS Garbage Collection is boosted.
>
> Signed-off-by: Daeho Jeong <daehoje...@google.com>
> ---
> v3: fix the range check condition
> v2: limit the available value range
> ---
> Documentation/ABI/testing/sysfs-fs-f2fs | 8 ++++++++
> fs/f2fs/gc.c | 3 ++-
> fs/f2fs/gc.h | 1 +
> fs/f2fs/sysfs.c | 9 +++++++++
> 4 files changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs
> b/Documentation/ABI/testing/sysfs-fs-f2fs
> index bf03263b9f46..931c1f63aa2e 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -861,3 +861,11 @@ Description: This is a read-only entry to show the
> value of sb.s_encoding_flags,
> SB_ENC_STRICT_MODE_FL 0x00000001
> SB_ENC_NO_COMPAT_FALLBACK_FL 0x00000002
> ============================ ==========
> +
> +What: /sys/fs/f2fs/<disk>/gc_boost_gc_multiple
> +Date: June 2025
> +Contact: "Daeho Jeong" <daehoje...@google.com>
> +Description: Set a multiplier for the background GC migration window when
> F2FS GC is
> + boosted.
> + Default: 5
> +
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 3cb5242f4ddf..de7e59bc0906 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -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;
> @@ -1749,7 +1750,7 @@ 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;
> }
> diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h
> index 5c1eaf55e127..efa1968810a0 100644
> --- a/fs/f2fs/gc.h
> +++ b/fs/f2fs/gc.h
> @@ -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 {
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 75134d69a0bd..b417b655d4e8 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -824,6 +824,13 @@ 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;
> @@ -1050,6 +1057,7 @@ 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);
> @@ -1220,6 +1228,7 @@ 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),
> --
> 2.50.1.470.g6ba607880d-goog
>
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