-
由 Tejun Heo 提交于
blkcg performs several allocations to track IOs per cgroup and enforce resource control. Most of these allocations are performed lazily on demand in the IO path and thus can't involve reclaim path. Currently, these allocations use GFP_ATOMIC; however, blkcg can gracefully deal with occassional failures of these allocations by punting IOs to the root cgroup and there's no reason to reach into the emergency reserve. This patch replaces GFP_ATOMIC with GFP_NOWAIT for the following allocations. * bdi_writeback_congested and blkcg_gq allocations in blkg_create(). * radix tree node allocations for blkcg->blkg_tree. * cfq_queue allocation on ioprio changes. Signed-off-by: NTejun Heo <tj@kernel.org> Suggested-and-Reviewed-by: NJeff Moyer <jmoyer@redhat.com> Suggested-by: NVivek Goyal <vgoyal@redhat.com> Signed-off-by: NJens Axboe <axboe@fb.com>
d93a11f1