linux-kernel - Re: files/process scaling problem? (was: [PATCH] Export shmem_file_setup and shmem

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Date:	Mon, 4 Aug 2008 06:51:01 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Keith Packard <keithp@...thp.com>,
	Ingo Oeser <ioe-lkml@...eria.de>,
	John Stoffel <john@...ffel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Eric Anholt <eric@...olt.net>, linux-kernel@...r.kernel.org
Subject: Re: files/process scaling problem? (was: [PATCH] Export
 shmem_file_setup and shmem_getpage for DRM-GEM)

On Mon, 4 Aug 2008 09:19:30 +0100
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > The other issue is that several important applications (including
> > the X server) use select instead of poll, and they have a small
> > maximum number of fds that they support. It seems like this could
> > be worked around by dup2'ing the shmem fds up a ways.
> 
> That would work yes. Switching to poll() would probably be even
> smarter, or if you have a large number of fds being scanned take a
> look at epoll which is likely to be far more efficient but wouldn't
> be available on so many systems - poll is at least standard.
> --

the hard part is that DRI is a library that gets linked into existing
applications... which already are using select ;-(

Fixing X is one thing and not impossible.. fixing all existing games in
the field is quite another


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