On 02/10/15 03:53 PM, Dan Williams wrote:
Yes, this location for dev_pagemap will not work. I've since moved it to a union with the lru list_head since ZONE_DEVICE pages memory should always have an elevated page count and never land on a slab allocator lru.
Oh, also, I was actually hoping to make use of the lru list_head in the future with ZONE_DEVICE memory. One thought I had was once we have a PCIe device with a BAR space, we'd then need to have a way of allocating these buffers when user space needs them. The simple way I was thinking was to just use the lru list head to store lists of used and unused pages -- though there are probably other solutions to this that don't require using struct pages.
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