Skip to content
Commit 5c03449d authored by Shaohua Li's avatar Shaohua Li Committed by Jens Axboe
Browse files

writeback: move inodes from one super_block together



__mark_inode_dirty adds inode to wb dirty list in random order. If a disk has
several partitions, writeback might keep spindle moving between partitions.
To reduce the move, better write big chunk of one partition and then move to
another. Inodes from one fs usually are in one partion, so idealy move indoes
from one fs together should reduce spindle move. This patch tries to address
this. Before per-bdi writeback is added, the behavior is write indoes
from one fs first and then another, so the patch restores previous behavior.
The loop in the patch is a bit ugly, should we add a dirty list for each
superblock in bdi_writeback?

Test in a two partition disk with attached fio script shows about 3% ~ 6%
improvement.

Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
Reviewed-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 5b0830cb
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment