linux-kernel - [f2fs-dev] [PATCH] f2fs: remove redundant set_page_dirty from write_compacted

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Date:	Thu, 24 Oct 2013 15:08:28 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	jaegeuk.kim@...sung.com
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	'谭姝' <shu.tan@...sung.com>
Subject: [f2fs-dev] [PATCH] f2fs: remove redundant set_page_dirty from
 write_compacted_summaries

Previously, set_page_dirty is called every time after writting one summary info into compacted summary page,
To avoid redundant set_page_dirty, we only call set_page_dirty before release page.

Signed-off-by: Yu Chao <chao2.yu@...sung.com>
---
 fs/f2fs/segment.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 3b20359..bdd53d0 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1128,8 +1128,6 @@ static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr)
 						SUM_JOURNAL_SIZE);
 	written_size += SUM_JOURNAL_SIZE;
 
-	set_page_dirty(page);
-
 	/* Step 3: write summary entries */
 	for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
 		unsigned short blkoff;
@@ -1148,18 +1146,20 @@ static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr)
 			summary = (struct f2fs_summary *)(kaddr + written_size);
 			*summary = seg_i->sum_blk->entries[j];
 			written_size += SUMMARY_SIZE;
-			set_page_dirty(page);
 
 			if (written_size + SUMMARY_SIZE <= PAGE_CACHE_SIZE -
 							SUM_FOOTER_SIZE)
 				continue;
 
+			set_page_dirty(page);
 			f2fs_put_page(page, 1);
 			page = NULL;
 		}
 	}
-	if (page)
+	if (page) {
+		set_page_dirty(page);
 		f2fs_put_page(page, 1);
+	}
 }
 
 static void write_normal_summaries(struct f2fs_sb_info *sbi,
-- 
1.7.9.5

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