writeback: let balance_dirty_pages() work on the matching cgroup bdi_writeback
authorTejun Heo <tj@kernel.org>
Fri, 22 May 2015 21:13:40 +0000 (17:13 -0400)
committerJens Axboe <axboe@fb.com>
Tue, 2 Jun 2015 14:33:35 +0000 (08:33 -0600)
commitdfb8ae567835425d27db8acc6c9fc5db88d38e2b
tree6da062fda862d1d751d5b40297f643a0a4221eed
parent910181343774cd5fed95900d9fd2cb4ff7758162
writeback: let balance_dirty_pages() work on the matching cgroup bdi_writeback

Currently, balance_dirty_pages() always work on bdi->wb.  This patch
updates it to work on the wb (bdi_writeback) matching memcg and blkcg
of the current task as that's what the inode is being dirtied against.

balance_dirty_pages_ratelimited() now pins the current wb and passes
it to balance_dirty_pages().

As no filesystem has FS_CGROUP_WRITEBACK yet, this doesn't lead to
visible behavior differences.

v2: Updated for per-inode wb association.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
mm/page-writeback.c