Tejun Heo <tj@xxxxxxxxxx> writes: > From b848495d2c987e960d1f7794966d82c05fcefc6d Mon Sep 17 00:00:00 2001 > From: Tejun Heo <tj@xxxxxxxxxx> > Date: Tue, 9 Jun 2015 13:19:40 +0900 > > 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: Tejun Heo <tj@xxxxxxxxxx> > Suggested-by: Jeff Moyer <jmoyer@xxxxxxxxxx> > Suggested-by: Vivek Goyal <vgoyal@xxxxxxxxxx> Thanks, Tejun! Reviewed-by: Jeff Moyer <jmoyer@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
