linux-kernel - Re: [RFC PATCH 1/2] mm, mincore2(): retrieve dax and tlb-size attributes of an address range

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Message-ID: <CAPcyv4hSs2M3LYscsepYat+FN9e3aUxSY3kGMFD6M9-9BCR5HQ@mail.gmail.com>
Date:   Mon, 12 Sep 2016 20:49:43 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Linux MM <linux-mm@...ck.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Xiao Guangrong <guangrong.xiao@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        linux-api@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-arch@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] mm, mincore2(): retrieve dax and tlb-size
 attributes of an address range

On Mon, Sep 12, 2016 at 7:16 PM, Nicholas Piggin <npiggin@...il.com> wrote:
> On Mon, 12 Sep 2016 10:29:17 -0700
[..]
>> Certainly one of the new request flags can indicate that the vector is
>> made up of larger entries.
>
> Hmm. Changing prototype depending on flags. I thought I was having
> a nightmare about ioctls for a minute there :)

Heh :)

> In general, is this what we want for a new API? Should we be thinking
> about an extent API?

This probably fits better with the use cases I know that want to
consume this information, something like fiemap (mextmap, maybe?) for
memory.