Re: [RFC] shmgetfd idea

[John Stultz <john.stultz@linaro.org>]

On 01/30/2014 08:02 AM, Kay Sievers wrote:
> On Thu, Jan 30, 2014 at 9:46 AM, Christoph Hellwig <hch@infradead.org> wrote:
>> On Mon, Jan 27, 2014 at 05:37:04PM -0800, John Stultz wrote:
>>> In working with ashmem and looking briefly at kdbus' memfd ideas,
>>> there's a commonality that both basically act as a method to provide
>>> applications with unlinked tmpfs/shmem fds.
>> Just use O_TMPFILE on a tmpfs file and you're done.
> Ashmem and kdbus can name the deleted files, which is useful for
> debugging and tools to show the associated name for the file
> descriptor. They also show up in /proc/$PID/maps/ and possibly in
> /proc/$PID/fd/.
>
> O_TMPFILE always creates files with just the name "/". Unless that is
> changed we wouldn't want switch over to O_TMPFILE, because we would
> lose that nice feature.

Not sure, but would Colin's vma-naming patch (or something like it) help
address this?
https://lkml.org/lkml/2013/10/30/518

thanks
-john

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