linux-kernel - Re: [PATCH 14/15] mm, dax, pmem: introduce {get|put}_dev

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Message-ID: <560F0854.9040300@deltatee.com>
Date:	Fri, 02 Oct 2015 16:42:28 -0600
From:	Logan Gunthorpe <logang@...tatee.com>
To:	Dan Williams <dan.j.williams@...el.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave@...1.net>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Stephen Bates <Stephen.Bates@...s.com>
Subject: Re: [PATCH 14/15] mm, dax, pmem: introduce {get|put}_dev_pagemap()
 for dax-gup



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.

Thanks,

Logan
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