linux-kernel - Re: [PATCH] Export shmem_file_setup and shmem

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Date:	Sun, 10 Aug 2008 21:23:47 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Keith Packard <keithp@...thp.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Eric Anholt <eric@...olt.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Export shmem_file_setup and shmem_getpage for DRM-GEM

On Fri, Aug 01, 2008 at 04:01:58PM -0700, Keith Packard wrote:
> On Fri, 2008-08-01 at 16:50 -0400, Christoph Hellwig wrote:
> 
> > Nope.  Let the userspace protion create a file in shmfs instead of
> > adding fugly kernel interfaces hdiing this fact.
> 
> I can't create that many files; I need thousands of them.

shmfs is perfectly happy to have thousands of files, there are workloads
that have a lot more than that.  Note that in other subthreads there is
the assumption that all of them are open and in the fd table at the same
time.  I haven't really seen a good explanation for that - objects on
shmfs are persistant until deleted, and when you keep your parent
directory fd open an openat to get at the actual object is cheap.

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