[v2 PATCH for-4.4 15/16] blk-mq: Avoid memory reclaim when remapping queues

From: Gabriel Krisman Bertazi [ Upstream commit 36e1f3d107867b25c616c2fd294f5a1c9d4e5d09 ] While stressing memory and IO at the same time we changed SMT settings, we were able to consistently trigger deadlocks in the mm system, which froze the entire machine. I think that under memory stress co

[PATCH for-4.4 15/16] blk-mq: Avoid memory reclaim when remapping queues

From: Gabriel Krisman Bertazi [ Upstream commit 36e1f3d107867b25c616c2fd294f5a1c9d4e5d09 ] While stressing memory and IO at the same time we changed SMT settings, we were able to consistently trigger deadlocks in the mm system, which froze the entire machine. I think that under memory stress co