linux-kernel - Re: [PATCH 2/2 v2] f2fs: skip checkpoint if there is no dirty segments

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Date:	Tue, 11 Aug 2015 22:09:16 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/2 v2] f2fs: skip checkpoint if there is no dirty
 segments

Change log from v1:
 - fix skipping gc incorrectly

>From 06f90d3757a6b7ff524cc112168488f31bbf830f Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@...nel.org>
Date: Tue, 11 Aug 2015 21:59:49 -0700
Subject: [PATCH] f2fs: skip checkpoint if there is no dirty and prefree
 segments

We should avoid needless checkpoints when there is no dirty and prefree segment.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/gc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index fcb263a..98bf538 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -811,7 +811,8 @@ gc_more:
 
 	if (gc_type == BG_GC && has_not_enough_free_secs(sbi, nfree)) {
 		gc_type = FG_GC;
-		write_checkpoint(sbi, &cpc);
+		if (dirty_segments(sbi) || prefree_segments(sbi))
+			write_checkpoint(sbi, &cpc);
 	}
 
 	if (!__get_victim(sbi, &segno, gc_type))
-- 
2.1.1

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