linux-kernel - [PATCH 5/5] f2fs: introduce a batched trim

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Date:	Tue, 27 Jan 2015 15:31:43 -0800
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 5/5] f2fs: introduce a batched trim

This patch introduces a batched trimming feature, which submits split discard
commands.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/f2fs.h    |  1 +
 fs/f2fs/segment.c | 15 ++++++++++-----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c0b83d6..ec4d16b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -104,6 +104,7 @@ enum {
 	CP_DISCARD,
 };
 
+#define BATCHED_TRIM_SEGMENTS	10
 struct cp_control {
 	int reason;
 	__u64 trim_start;
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 31c4e57..6c9c784 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1066,14 +1066,19 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
 	end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
 						GET_SEGNO(sbi, end);
 	cpc.reason = CP_DISCARD;
-	cpc.trim_start = start_segno;
-	cpc.trim_end = end_segno;
 	cpc.trim_minlen = range->minlen >> sbi->log_blocksize;
 
 	/* do checkpoint to issue discard commands safely */
-	mutex_lock(&sbi->gc_mutex);
-	write_checkpoint(sbi, &cpc);
-	mutex_unlock(&sbi->gc_mutex);
+	for (; start_segno <= end_segno;
+				start_segno += BATCHED_TRIM_SEGMENTS + 1) {
+		cpc.trim_start = start_segno;
+		cpc.trim_end = min_t(unsigned int,
+				start_segno + BATCHED_TRIM_SEGMENTS, end_segno);
+
+		mutex_lock(&sbi->gc_mutex);
+		write_checkpoint(sbi, &cpc);
+		mutex_unlock(&sbi->gc_mutex);
+	}
 out:
 	range->len = cpc.trimmed << sbi->log_blocksize;
 	return 0;
-- 
2.1.1

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