From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Sat, 8 Apr 2017 00:25:54 +0000 (-0700)
Subject: f2fs: avoid frequent checkpoint during f2fs_gc
X-Git-Tag: v4.12-rc1~71^2~44
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8fd5a37efa0b036353df253e20dabe8773c039cd;p=thirdparty%2Fkernel%2Flinux.git

f2fs: avoid frequent checkpoint during f2fs_gc

Now we're doing SSR aggressively more than ever before, so once we reach to
the reserved_segment, f2fs_balance_fs will call f2fs_gc, which triggers
checkpoint everytime. We actually must avoid that.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index e2f9b2b12b743..9172112d62464 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -966,9 +966,11 @@ gc_more:
 		 * threshold, we can make them free by checkpoint. Then, we
 		 * secure free segments which doesn't need fggc any more.
 		 */
-		ret = write_checkpoint(sbi, &cpc);
-		if (ret)
-			goto stop;
+		if (prefree_segments(sbi)) {
+			ret = write_checkpoint(sbi, &cpc);
+			if (ret)
+				goto stop;
+		}
 		if (has_not_enough_free_secs(sbi, 0, 0))
 			gc_type = FG_GC;
 	}