linux-ext4 - Re: Problems with VM_MIXEDMAP removal from /proc/<pid>/smaps

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Message-ID: <20181002143713.GA19845@infradead.org>
Date:   Tue, 2 Oct 2018 07:37:13 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jan Kara <jack@...e.cz>
Cc:     Johannes Thumshirn <jthumshirn@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, linux-nvdimm@...ts.01.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: Problems with VM_MIXEDMAP removal from /proc/<pid>/smaps

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.