On 7/19/25 05:50, Daeho Jeong wrote:
> From: Daeho Jeong <daehoje...@google.com>
>
> Add this to control GC algorithm for boost GC.
>
> Signed-off-by: Daeho Jeong <daehoje...@google.com>
> ---
> v2: use GC_GREEDY instead of 1
> ---
> Documentation/ABI/testing/sysfs-fs-f2fs | 8 +++++++-
> fs/f2fs/gc.c | 3 ++-
> fs/f2fs/gc.h | 1 +
> fs/f2fs/sysfs.c | 16 ++++++++++++++++
> 4 files changed, 26 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs
> b/Documentation/ABI/testing/sysfs-fs-f2fs
> index 931c1f63aa2e..2158055cd9d1 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -866,6 +866,12 @@ 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.
> + 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" <daehoje...@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 de7e59bc0906..0d7703e7f9e0 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -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)
> @@ -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 efa1968810a0..1a2e7a84b59f 100644
> --- 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 b0270b1c939c..3a52f51ee3c6 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -824,6 +824,20 @@ 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;
> + }
This check should be in ("f2fs: add gc_boost_gc_multiple sysfs node"), right?
Thanks,
> +
> + 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;
> @@ -1051,6 +1065,7 @@ 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);
> @@ -1222,6 +1237,7 @@ 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),
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