writeback: update wb_over_bg_thresh() to use wb_domain aware operations
authorTejun Heo <tj@kernel.org>
Fri, 22 May 2015 22:23:32 +0000 (18:23 -0400)
committerJens Axboe <axboe@fb.com>
Tue, 2 Jun 2015 14:38:13 +0000 (08:38 -0600)
commit947e9762a8ddefda38aa21e249e6a4fec215cd12
tree6ac8e8f9636ec937e720449753c88874bbd41620
parentaa661bbe1e61ce80ca4ae98804f673ede94b0827
writeback: update wb_over_bg_thresh() to use wb_domain aware operations

wb_over_bg_thresh() currently uses global_dirty_limits() and
wb_dirty_limit() both of which are wrappers around operations which
take dirty_throttle_control.  For cgroup writeback support, the
function will be updated to also consider memcg wb_domains which
requires the context information carried in dirty_throttle_control.

This patch updates wb_over_bg_thresh() so that it uses the underlying
wb_domain aware operations directly and builds the global
dirty_throttle_control in the process.

This patch doesn't introduce any behavioral changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Greg Thelen <gthelen@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
mm/page-writeback.c