tree 8f13c049839deb9f6cde4deb440b2a3758f10f64
parent 30bda0b8ae470997dc681d6fd82108bac5caebf8
author Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> 1243376832 +0900
committer Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> 1244644871 +0900

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>