From: Daeho Jeong <daehoje...@google.com>
Add this to control GC algorithm for boost GC.
Signed-off-by: Daeho Jeong <daehoje...@google.com>
---
v3: fix the range check condition
v2: use GC_GREEDY instead of 1
---
Documentation/ABI/testing/sysfs-fs-f2fs | 6 ++++++
fs/f2fs/gc.c | 3 ++-
fs/f2fs/gc.h | 1 +
fs/f2fs/sysfs.c | 9 +++++++++
4 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs
b/Documentation/ABI/testing/sysfs-fs-f2fs
index 6083119851a6..d6881572c53e 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -869,3 +869,9 @@ Description: Set a multiplier for the background GC
migration window when F2FS G
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 b417b655d4e8..3a52f51ee3c6 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -831,6 +831,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
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;
@@ -1058,6 +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);
@@ -1229,6 +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),
--
2.50.1.487.gc89ff58d15-goog
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