linux-kernel - [PATCH] f2fs: don't bother wait

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Message-Id: <20220718032840.9653-1-qixiaoyu1@xiaomi.com>
Date:   Mon, 18 Jul 2022 11:28:40 +0800
From:   qixiaoyu1 <qxy65535@...il.com>
To:     chao@...nel.org, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, qixiaoyu1 <qixiaoyu1@...omi.com>
Subject: [PATCH] f2fs: don't bother wait_ms by foreground gc

f2fs_gc returns -EINVAL via f2fs_balance_fs when there is enough free
secs after write checkpoint, but with gc_merge enabled, it will cause
the sleep time of gc thread to be set to no_gc_sleep_time even if there
are many dirty segments can be selected.

Signed-off-by: qixiaoyu1 <qixiaoyu1@...omi.com>
---
 fs/f2fs/gc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index d5fb426e0747..cb8ca992d986 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -150,8 +150,12 @@ static int gc_thread_func(void *data)
 		gc_control.nr_free_secs = foreground ? 1 : 0;
 
 		/* if return value is not zero, no victim was selected */
-		if (f2fs_gc(sbi, &gc_control))
-			wait_ms = gc_th->no_gc_sleep_time;
+		if (f2fs_gc(sbi, &gc_control)) {
+			/* don't bother wait_ms by foreground gc */
+			if (!foreground) {
+				wait_ms = gc_th->no_gc_sleep_time;
+			}
+		}
 
 		if (foreground)
 			wake_up_all(&gc_th->fggc_wq);
-- 
2.36.1