From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 15 Jun 2013 13:14:30 +0000 (-0400)
Subject: n_tty: Separate buffer indices to prevent cache-line sharing
X-Git-Tag: v3.12-rc1~182^2~204
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fb7aa03db605e4f0b9a62cd4c77177c2596edd95;p=pandora-kernel.git

n_tty: Separate buffer indices to prevent cache-line sharing

If the read buffer indices are in the same cache-line, cpus will
contended over the cache-line (so called 'false sharing').

Separate the producer-published fields from the consumer-published
fields; document the locks relevant to each field.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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