From: Christoph Lameter <clameter@engr.sgi.com>
To: Simon White <s_a_white@email.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Best Kernel Timers?
Date: Wed, 28 Sep 2005 10:33:12 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.62.0509281031340.14338@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20050928093602.DFA0B8401C@ws1-5.us4.outblaze.com>
On Wed, 28 Sep 2005, Simon White wrote:
> Now as an alternative it is again desired that a version (although
> wont perfectly work) be available to a vanilla 2.6 kernel (possibly
> 2.4) with similiar limitations as before. Its a shame the posix
> calls appear to not be supported in kernel for drivers so I have
> wrapped the calls for semaphores/mutexs/threads to kernel
> equivalents.
They are supported. See drivers/char/mmtimer.c for an example
implementation.
> However I have no idea what to do for the timers. Is there
> something suitable inkernel that would provide an async callback
> to pre-empt a realtime thread and provide better resolution than
> HZ a far amount of the time? Or do I have to run a seperate lower
> priority busy waiting thread to wakeup the realtime one?
Yes. Provide an implementation for a posix clock like done in the mmtimer
driver.
next prev parent reply other threads:[~2005-09-28 17:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-28 9:36 Best Kernel Timers? Simon White
2005-09-28 9:53 ` Steven Rostedt
2005-09-28 17:33 ` Christoph Lameter [this message]
2005-09-28 10:08 Simon White
2005-09-28 11:17 ` Steven Rostedt
2005-09-28 17:34 ` Christoph Lameter
2005-09-28 11:55 Simon White
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