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[PATCH 2/2] f2fs: skip checkpoint if there is no dirty segments

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  [PATCH 2/2] f2fs: skip checkpoint if there is no dirty segments Jaegeuk Kim <jaegeuk@kernel.org> - 2015-08-11 03:30 +0200
    Re: [PATCH 2/2 v2] f2fs: skip checkpoint if there is no dirty  segments Jaegeuk Kim <jaegeuk@kernel.org> - 2015-08-12 07:10 +0200
      RE: [f2fs-dev] [PATCH 2/2 v2] f2fs: skip checkpoint if there is no  dirty segments Chao Yu <chao2.yu@samsung.com> - 2015-08-12 11:50 +0200
        Re: [f2fs-dev] [PATCH 2/2 v3] f2fs: skip checkpoint if there is no  dirty segments Jaegeuk Kim <jaegeuk@kernel.org> - 2015-08-13 03:30 +0200

#1204670 — [PATCH 2/2] f2fs: skip checkpoint if there is no dirty segments

We should avoid wrong checkpoints when there is no dirty segments.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/gc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index fcb263a..c4ed116 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -809,13 +809,14 @@ gc_more:
 	if (unlikely(f2fs_cp_error(sbi)))
 		goto stop;
 
+	if (!__get_victim(sbi, &segno, gc_type))
+		goto stop;
+
 	if (gc_type == BG_GC && has_not_enough_free_secs(sbi, nfree)) {
 		gc_type = FG_GC;
 		write_checkpoint(sbi, &cpc);
 	}
 
-	if (!__get_victim(sbi, &segno, gc_type))
-		goto stop;
 	ret = 0;
 
 	/* readahead multi ssa blocks those have contiguous address */
-- 
2.1.1

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#1205588 — 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@kernel.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@kernel.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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#1205858 — RE: [f2fs-dev] [PATCH 2/2 v2] f2fs: skip checkpoint if there is no dirty segments

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@kernel.org]
> Sent: Wednesday, August 12, 2015 1:09 PM
> To: linux-kernel@vger.kernel.org; linux-fsdevel@vger.kernel.org;
> linux-f2fs-devel@lists.sourceforge.net
> Subject: Re: [f2fs-dev] [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@kernel.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@kernel.org>

Reviewed-by: Chao Yu <chao2.yu@samsung.com>

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#1206460 — Re: [f2fs-dev] [PATCH 2/2 v3] f2fs: skip checkpoint if there is no dirty segments

Change log from v2:
 - consider omitting current dirty segments

From 181cb245f6a406e89c00976f65a5727956a72942 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@kernel.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.

eviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/gc.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index fcb263a..81de28d8 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -792,7 +792,8 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
 
 int f2fs_gc(struct f2fs_sb_info *sbi)
 {
-	unsigned int segno, i;
+	unsigned int segno = NULL_SEGNO;
+	unsigned int i;
 	int gc_type = BG_GC;
 	int nfree = 0;
 	int ret = -1;
@@ -811,10 +812,11 @@ gc_more:
 
 	if (gc_type == BG_GC && has_not_enough_free_secs(sbi, nfree)) {
 		gc_type = FG_GC;
-		write_checkpoint(sbi, &cpc);
+		if (__get_victim(sbi, &segno, gc_type) || prefree_segments(sbi))
+			write_checkpoint(sbi, &cpc);
 	}
 
-	if (!__get_victim(sbi, &segno, gc_type))
+	if (segno == NULL_SEGNO && !__get_victim(sbi, &segno, gc_type))
 		goto stop;
 	ret = 0;
 
-- 
2.1.1

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