Commit 378b8e1a authored Aug 31, 2012 by Namjae Jeon Committed by Jan Kara Sep 04, 2012

udf: add writepages support for udf



Use mpage_writepages() instead of multiple calls to udf_writepage()
to make performance higher.

*Write Speed with writepage() =
 RecSize     ReadSpeed    WriteSpeed  RanReadSpeed RanWriteSpeed
10485760    0.00MB/sec    8.56MB/sec    0.00MB/sec    8.20MB/sec
 1048576    0.00MB/sec    8.57MB/sec    0.00MB/sec    6.42MB/sec
  524288    0.00MB/sec    8.59MB/sec    0.00MB/sec    5.24MB/sec
  262144    0.00MB/sec    8.59MB/sec    0.00MB/sec    4.17MB/sec
  131072    0.00MB/sec    8.53MB/sec    0.00MB/sec    3.32MB/sec
   65536    0.00MB/sec    8.49MB/sec    0.00MB/sec    2.31MB/sec

*Write Speed with writepages()
RecSize     ReadSpeed    WriteSpeed  RanReadSpeed RanWriteSpeed
10485760    0.00MB/sec    9.88MB/sec    0.00MB/sec    9.60MB/sec
 1048576    0.00MB/sec    9.95MB/sec    0.00MB/sec    7.52MB/sec
  524288    0.00MB/sec    9.98MB/sec    0.00MB/sec    6.16MB/sec
  262144    0.00MB/sec    9.90MB/sec    0.00MB/sec    4.98MB/sec
  131072    0.00MB/sec    9.89MB/sec    0.00MB/sec    3.78MB/sec
   65536    0.00MB/sec    9.81MB/sec    0.00MB/sec    2.50MB/sec

There is about 1.4MB/sec speed improvement over 8.5MB/sec,
which comes out around 16% improvement.

Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Ashish Sangwan <ashish.sangwan2@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

parent e4230108

fs/udf/inode.c

+7 −0

Original line number	Original line	Diff line number	Diff line
	@@ -100,6 +100,12 @@ static int udf_writepage(struct page page, struct writeback_control wbc)
	return block_write_full_page(page, udf_get_block, wbc);		return block_write_full_page(page, udf_get_block, wbc);
	}		}

			static int udf_writepages(struct address_space *mapping,
			struct writeback_control *wbc)
			{
			return mpage_writepages(mapping, wbc, udf_get_block);
			}

	static int udf_readpage(struct file file, struct page page)		static int udf_readpage(struct file file, struct page page)
	{		{
	return mpage_readpage(page, udf_get_block);		return mpage_readpage(page, udf_get_block);
	@@ -145,6 +151,7 @@ const struct address_space_operations udf_aops = {
	.readpage = udf_readpage,		.readpage = udf_readpage,
	.readpages = udf_readpages,		.readpages = udf_readpages,
	.writepage = udf_writepage,		.writepage = udf_writepage,
			.writepages = udf_writepages,
	.write_begin = udf_write_begin,		.write_begin = udf_write_begin,
	.write_end = generic_write_end,		.write_end = generic_write_end,
	.bmap = udf_bmap,		.bmap = udf_bmap,