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

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Message-Id: <20161115160449.2b34c771aad710a8c8e06be0@linux-foundation.org>
Date:   Tue, 15 Nov 2016 16:04:49 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Dave Hansen <dave.hansen@...el.com>, linux-nvdimm@...1.01.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 Thu, 10 Nov 2016 14:11:57 -0800 Dan Williams <dan.j.williams@...el.com> 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.
> 
> ...
>
>  fs/proc/task_mmu.c |   10 +++++++++-

Please update Documentation/filesystems/proc.txt.

(While there, please check to see if anything else is missed?)