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

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Message-ID: <20080804091930.164f31c3@lxorguk.ukuu.org.uk>
Date:	Mon, 4 Aug 2008 09:19:30 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Keith Packard <keithp@...thp.com>
Cc:	Ingo Oeser <ioe-lkml@...eria.de>, keithp@...thp.com,
	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)

> 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.
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