[PATCH] f2fs: maintain one time GC mode is enabled during whole zoned GC cycle

[PATCH] f2fs: maintain one time GC mode is enabled during whole zoned GC cycle

[Daeho Jeong]

From: Daeho Jeong <daehojeong@google.com>

The current version missed setting one time GC for normal zoned GC
cycle. So, valid threshold control is not working. Need to fix it to
prevent excessive GC for zoned devices.

Fixes: e791d00bd06c ("f2fs: add valid block ratio not to do excessive GC for one time GC")
Signed-off-by: Daeho Jeong <daehojeong@google.com>
---
 fs/f2fs/gc.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 098e9f71421e..88bbcf291034 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -38,13 +38,14 @@ static int gc_thread_func(void *data)
 	struct f2fs_gc_control gc_control = {
 		.victim_segno = NULL_SEGNO,
 		.should_migrate_blocks = false,
-		.err_gc_skipped = false };
+		.err_gc_skipped = false,
+		.one_time = false };
 
 	wait_ms = gc_th->min_sleep_time;
 
 	set_freezable();
 	do {
-		bool sync_mode, foreground = false;
+		bool sync_mode, foreground = false, gc_boost = false;
 
 		wait_event_freezable_timeout(*wq,
 				kthread_should_stop() ||
@@ -52,8 +53,12 @@ static int gc_thread_func(void *data)
 				gc_th->gc_wake,
 				msecs_to_jiffies(wait_ms));
 
-		if (test_opt(sbi, GC_MERGE) && waitqueue_active(fggc_wq))
+		if (test_opt(sbi, GC_MERGE) && waitqueue_active(fggc_wq)) {
 			foreground = true;
+			gc_control.one_time = false;
+		} else if (f2fs_sb_has_blkzoned(sbi)) {
+			gc_control.one_time = true;
+		}
 
 		/* give it a try one time */
 		if (gc_th->gc_wake)
@@ -81,8 +86,6 @@ static int gc_thread_func(void *data)
 			continue;
 		}
 
-		gc_control.one_time = false;
-
 		/*
 		 * [GC triggering condition]
 		 * 0. GC is not conducted currently.
@@ -132,7 +135,7 @@ static int gc_thread_func(void *data)
 		if (need_to_boost_gc(sbi)) {
 			decrease_sleep_time(gc_th, &wait_ms);
 			if (f2fs_sb_has_blkzoned(sbi))
-				gc_control.one_time = true;
+				gc_boost = true;
 		} else {
 			increase_sleep_time(gc_th, &wait_ms);
 		}
@@ -141,7 +144,7 @@ static int gc_thread_func(void *data)
 					FOREGROUND : BACKGROUND);
 
 		sync_mode = (F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC) ||
-			(gc_control.one_time && gc_th->boost_gc_greedy);
+			(gc_boost && gc_th->boost_gc_greedy);
 
 		/* foreground GC was been triggered via f2fs_balance_fs() */
 		if (foreground && !f2fs_sb_has_blkzoned(sbi))
-- 
2.51.0.618.g983fd99d29-goog

Re: [f2fs-dev] [PATCH] f2fs: maintain one time GC mode is enabled during whole zoned GC cycle

[Chao Yu]

On 10/4/2025 6:43 AM, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@google.com>
> 
> The current version missed setting one time GC for normal zoned GC
> cycle. So, valid threshold control is not working. Need to fix it to
> prevent excessive GC for zoned devices.
> 
> Fixes: e791d00bd06c ("f2fs: add valid block ratio not to do excessive GC for one time GC")
> Signed-off-by: Daeho Jeong <daehojeong@google.com>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,

Re: [f2fs-dev] [PATCH] f2fs: maintain one time GC mode is enabled during whole zoned GC cycle

[patchwork-bot+f2fs]

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Fri,  3 Oct 2025 15:43:08 -0700 you wrote:
> From: Daeho Jeong <daehojeong@google.com>
> 
> The current version missed setting one time GC for normal zoned GC
> cycle. So, valid threshold control is not working. Need to fix it to
> prevent excessive GC for zoned devices.
> 
> Fixes: e791d00bd06c ("f2fs: add valid block ratio not to do excessive GC for one time GC")
> Signed-off-by: Daeho Jeong <daehojeong@google.com>
> 
> [...]

Here is the summary with links:
  - [f2fs-dev] f2fs: maintain one time GC mode is enabled during whole zoned GC cycle
    https://git.kernel.org/jaegeuk/f2fs/c/5d431cc8759b

You are awesome, thank you!
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