Re: [PATCH RESEND v2 2/2] blk-mq: Avoid memory reclaim when remapping queues

2016-12-14 Thread Jens Axboe
On 12/06/2016 08:31 AM, Gabriel Krisman Bertazi wrote: > 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 conditions, the large

[PATCH RESEND v2 2/2] blk-mq: Avoid memory reclaim when remapping queues

2016-12-06 Thread Gabriel Krisman Bertazi
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 conditions, the large allocations performed by blk_mq_init_rq_map may trigger a reclaim, which