linux-kernel - Canonical ring-buffer code : SMP, single-reader/writer

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Date:	Sun, 17 Oct 2010 22:50:19 +0100
From:	Tom Brown <sa212+emis@...onix.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Canonical ring-buffer code : SMP, single-reader/writer

Does anyone happen to know of any good example code that I could use in 
a driver for a simple single-reader, single-writer, ring buffer, on an 
SMP system?

My own code doesn't use any locks, but I'm concerned that it may be 
flaky. It's running on an 8-core processor, and I'm worried that I may 
be seeing SMP locking issues which I don't understand because the driver 
is on one core, while the user is on another core.

In my case, the producer is the driver, and the consumer is the user. I 
could just lock all the driver writes to the buffer and the driver's 
update of the shared 'last written' pointer, but that seems a really 
poor design.

Thanks -

Tom
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