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authorTejun Heo <tj@kernel.org>2013-05-14 13:52:38 -0700
committerTejun Heo <tj@kernel.org>2013-05-14 13:52:38 -0700
commit6bc9c2b464fb89eab705da87aa4284171d942369 (patch)
tree9b302b4d3f036f28ee2c0198148a3bf7d8bceadf /usr
parent9e660acffcd1b5adc4ec1ffba0cbb584f86b8907 (diff)
downloadlinux-linaro-stable-6bc9c2b464fb89eab705da87aa4284171d942369.tar.gz
blk-throttle: make tg_dispatch_one_bio() ready for hierarchy
tg_dispatch_one_bio() currently assumes that the parent_sq is the top level one and the bio being dispatched is ready to be issued; however, this assumption will be wrong with proper hierarchy support. This patch makes the following changes to make tg_dispatch_on_bio() ready for hiearchy. * throtl_data->nr_queued[] is incremented in blk_throtl_bio() instead of throtl_add_bio_tg() so that throtl_add_bio_tg() can be used to transfer a bio from a child tg to its parent. * tg_dispatch_one_bio() is updated to distinguish whether its parent is another throtl_grp or the throtl_data. If former, the bio is transferred to the parent throtl_grp using throtl_add_bio_tg(). If latter, the bio is ready to be issued and put on the top-level service_queue's bio_lists[] and throtl_data->nr_queued is decremented. As all throtl_grps currently have the top level service_queue as their ->parent_sq, this patch in itself doesn't make any behavior difference. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Vivek Goyal <vgoyal@redhat.com>
Diffstat (limited to 'usr')
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