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

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Message-ID: <20181002145206.GA10903@infradead.org>
Date:   Tue, 2 Oct 2018 07:52:06 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>,
        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 04:44:13PM +0200, Johannes Thumshirn wrote:
> On Tue, Oct 02, 2018 at 07:37:13AM -0700, Christoph Hellwig wrote:
> > No, it should not.  DAX is an implementation detail thay may change
> > or go away at any time.
> 
> Well we had an issue with an application checking for dax, this is how
> we landed here in the first place.

So what exacty is that "DAX" they are querying about (and no, I'm not
joking, nor being philosophical).