Commit e85dc1d5 authored May 27, 2009 by Ryusuke Konishi

nilfs2: enable sync_page method



This adds a missing sync_page method which unplugs bio requests when
waiting for page locks. This will improve read performance of nilfs.

Here is a measurement result using dd command.

Without this patch:

 # mount -t nilfs2 /dev/sde1 /test
 # dd if=/test/aaa of=/dev/null bs=512k
 1024+0 records in
 1024+0 records out
 536870912 bytes (537 MB) copied, 6.00688 seconds, 89.4 MB/s

With this patch:

 # mount -t nilfs2 /dev/sde1 /test
 # dd if=/test/aaa of=/dev/null bs=512k
 1024+0 records in
 1024+0 records out
 536870912 bytes (537 MB) copied, 3.54998 seconds, 151 MB/s

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

parent 30bda0b8

fs/nilfs2/inode.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -240,7 +240,7 @@ nilfs_direct_IO(int rw, struct kiocb iocb, const struct iovec iov,
		struct address_space_operations nilfs_aops = {
		.writepage = nilfs_writepage,
		.readpage = nilfs_readpage,
		/* .sync_page = nilfs_sync_page, */
		.sync_page = block_sync_page,
		.writepages = nilfs_writepages,
		.set_page_dirty = nilfs_set_page_dirty,
		.readpages = nilfs_readpages,