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

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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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Peter Hurley 2013-07-24 08:29:56 -04:00 • committed by Greg Kroah-Hartman

parent 4b293492ae

commit e60d27c4d8

1 changed files with 94 additions and 72 deletions

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drivers/tty/n_tty.c

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