Re: Problems with VM_MIXEDMAP removal from /proc/<pid>/smaps

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Subject: Re: Problems with VM_MIXEDMAP removal from /proc/<pid>/smaps
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 2 Oct 2018 07:37:13 -0700
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, linux-nvdimm@xxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, linux-api@xxxxxxxxxxxxxxx
In-reply-to: <20181002142959.GD9127@quack2.suse.cz>
References: <20181002100531.GC4135@quack2.suse.cz> <20181002121039.GA3274@linux-x5ow.site> <20181002142959.GD9127@quack2.suse.cz>
User-agent: Mutt/1.9.2 (2017-12-15)

On Tue, Oct 02, 2018 at 04:29:59PM +0200, Jan Kara wrote:
> > OK naive question from me, how do we want an application to be able to
> > check if it is running on a DAX mapping?
> 
> The question from me is: Should application really care?

No, it should not.  DAX is an implementation detail thay may change
or go away at any time.

Follow-Ups:
- Re: Problems with VM_MIXEDMAP removal from /proc/<pid>/smaps
  - From: Jan Kara
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  - From: Johannes Thumshirn

References:
- Re: Problems with VM_MIXEDMAP removal from /proc/<pid>/smaps
  - From: Jan Kara

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