linux-kernel - Re: [PATCH] mm: add ZONE_DEVICE statistics to smaps

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Date:   Fri, 11 Nov 2016 09:42:18 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>, akpm@...ux-foundation.org
Cc:     Dave Hansen <dave.hansen@...el.com>, linux-nvdimm@...ts.01.org,
        Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH] mm: add ZONE_DEVICE statistics to smaps

On 11/11/2016 03:41 AM, Dan Williams wrote:
> ZONE_DEVICE pages are mapped into a process via the filesystem-dax and
> device-dax mechanisms.  There are also proposals to use ZONE_DEVICE
> pages for other usages outside of dax.  Add statistics to smaps so
> applications can debug that they are obtaining the mappings they expect,
> or otherwise accounting them.

This might also help when we will have ZONE_DEVICE based solution for
HMM based device memory.