From: Peter Hurley <peter@hurleysoftware.com>
Date: Wed, 24 Jul 2013 12:29:56 +0000 (-0400)
Subject: n_tty: Factor LNEXT processing from per-char i/o path
X-Git-Tag: v3.12-rc1~182^2~153
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e60d27c4d8b33ba20896b76b6558f061bc6460ff;p=pandora-kernel.git

n_tty: Factor LNEXT processing from per-char i/o path

LNEXT processing accounts for ~15% of total cpu time in end-to-end
tty i/o; factor the lnext test/clear from the per-char i/o path.

Instead, attempt to immediately handle the literal next char if not
at the end of this received buffer; otherwise, handle the first char
of the next received buffer as the literal next char, then continue
with normal i/o.

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

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