From: Linus Walleij <linus.ml.walleij@gmail.com>
To: Tim Bird <tim.bird@am.sony.com>
Cc: CE Linux Developers List <celinux-dev@tree.celinuxforum.org>,
linux-embedded <linux-embedded@vger.kernel.org>
Subject: Re: Project Proposal: add sleeping spinlocks to mainline kernel
Date: Thu, 17 Dec 2009 10:54:23 +0100 [thread overview]
Message-ID: <63386a3d0912170154k6521433fl90b2ae96efb70a34@mail.gmail.com> (raw)
In-Reply-To: <4B296390.3090004@am.sony.com>
2009/12/16 Tim Bird <tim.bird@am.sony.com>:
> Summary: add sleeping spinlocks to the mainline kernel
If realtime performance overall is a big deal for CELF I would suggest
adding "Kill-the-BKL" to the suggested projects. There are still some
RTOS people using the BKL as an argument to flak the Linux kernel,
c.f.
http://www.freescale.com/files/32bit/doc/ref_manual/EMBMCRM.pdf
(section 5.2)
Another item could be to go through some common embedded
arch drivers and switch them from request_irq() to request_threaded_irq()
just based on the observation that almost nobody actually use that
in the mainline kernel, though I'm sure they should,
if realtime is a desired feature.
(The wm8350-core driver is an excellent example of a situation where
it is used properly.)
NB: I'm not a member of the CE Linux Forum and nor is my company
so I'm just talking freely here. (linux-embedded is public, hehe.)
Yours,
Linus Walleij
next prev parent reply other threads:[~2009-12-17 9:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-16 22:47 Project Proposal: add sleeping spinlocks to mainline kernel Tim Bird
2009-12-17 9:54 ` Linus Walleij [this message]
2009-12-17 18:45 ` Tim Bird
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