linux-kernel - Re: [PATCH 5/9] mfd: Add UART support for the ST-Ericsson CG2900.

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Message-ID: <20101029172443.61f7b067@pyx>
Date:	Fri, 29 Oct 2010 17:24:43 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Par-Gunnar Hjalmdahl <pghatwork@...il.com>
Cc:	linus.walleij@...ricsson.com, linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/9] mfd: Add UART support for the ST-Ericsson CG2900.

> The reason is that the work is generated so often that a work is not
> finished before next work of same type comes. This is especially true
> for transmit and receive. Then I get 0 back when queuing the work and
> there is no real way to solve it from what I can see than to allocate
> new work structures every time.

So if that is the case what bounds your memory usage - can a busy box end
up with thousands of work queue slos used ? It sounds like your model is
perhaps wrong - if there is a continual stream of work maybe you should
simply have a kernel thread to handle it if it cannot be deferred
- remember ldisc code is able to sleep in most paths.

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