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Message-ID: <52E81BB3.6060306@linaro.org>
Date: Tue, 28 Jan 2014 13:05:55 -0800
From: John Stultz <john.stultz@linaro.org>
MIME-Version: 1.0
Subject: Re: [RFC] shmgetfd idea
References: <52E709C0.1050006@linaro.org> <52E7298D.5020001@zytor.com> <52E80B85.8020302@linaro.org> <52E814FF.6060403@zytor.com> <52E819F0.6040806@linaro.org> <CAPXgP11Fv6TU+o2Eui5rVW0A37U7KjwC0DZYbQOJJ8rEAYOiJg@mail.gmail.com>
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To: Kay Sievers <kay@vrfy.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Greg KH <gregkh@linuxfoundation.org>, Android Kernel Team <kernel-team@android.com>, Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mgorman@suse.de>, Hugh Dickins <hughd@google.com>, Dave Hansen <dave.hansen@intel.com>, Rik van Riel <riel@redhat.com>, Michel Lespinasse <walken@google.com>, Johannes Weiner <hannes@cmpxchg.org>, Neil Brown <neilb@suse.de>, Andrea Arcangeli <aarcange@redhat.com>, Takahiro Akashi <takahiro.akashi@linaro.org>, Minchan Kim <minchan@kernel.org>, Lennart Poettering <mzxreary@0pointer.de>

On 01/28/2014 01:01 PM, Kay Sievers wrote:
> On Tue, Jan 28, 2014 at 9:58 PM, John Stultz <john.stultz@linaro.org> wrote:
>> On 01/28/2014 12:37 PM, H. Peter Anvin wrote:
>>> On 01/28/2014 11:56 AM, John Stultz wrote:
>>>> Thanks for reminding me about O_TMPFILE.. I have it on my list to look
>>>> into how it could be used.
>>>>
>>>> As for the O_TMPFILE only tmpfs option, it seems maybe a little clunky
>>>> to me, but possible. If others think this would be preferred over a new
>>>> syscall, I'll dig in deeper.
>>>>
>>> What is clunky about it?  It reuses an existing interface and still
>>> points to the specific tmpfs instance that should be populated.
>> It would require new mount point convention that userland would have to
>> standardize.  To me (and admittedly its a taste thing), a new
>> O_TMPFILE-only tmpfs mount point seems to be to be a bigger interface
>> change from an application writers perspective then a new syscall.
>>
>> But maybe I'm misunderstanding your suggestion?
> General purpose Linux has /dev/shm/ for that already, which will not
> go away anytime soon..

Right, though making /dev/shm/ O_TMPFILE only would likely break things, no?

thanks
-john

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