linux-kernel - Re: [RFC 2/2] serial/8250.c: Use self-adjusting list for port poll order.

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Message-ID: <20081114214711.3c1d1473@lxorguk.ukuu.org.uk>
Date:	Fri, 14 Nov 2008 21:47:11 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"George Spelvin" <linux@...izon.com>
Cc:	linux-kernel@...r.kernel.org, linux@...izon.com
Subject: Re: [RFC 2/2] serial/8250.c: Use self-adjusting list for port poll
 order.

> This code does that by using the previous poll cycles as a hint.
> If a port is idle, it will migrate to the end of the list and
> only have to be checked once.
> 
> Part 1 changed the list to singly-linked to make the list shuffling easier.
> 
> Comments?  Please?

Is it really worth the complexity

- PCI ports are shared IRQ always
- Legacy ports are almost never shared IRQ on the LPC bus (and are
increasingly going away)

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