On 11/25/2015 04:36 PM, Vladimir Davydov wrote: > Block device drivers often hand off io request processing to kernel > threads (example: device mapper). If such a thread calls kmalloc, it can > dive into direct reclaim path and end up waiting for too_many_isolated > to return false, blocking writeback. This can lead to a dead lock if the Shouldn't such allocation lack __GFP_IO to prevent this and other kinds of deadlocks? And/or have mempools? PF_KTHREAD looks like a big hammer to me that will solve only one potential problem... -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>