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Message-ID: <loom.20130218T124824-843@post.gmane.org> Date: Mon, 18 Feb 2013 11:55:38 +0000 (UTC) From: el es <el.es.cr@...il.com> To: linux-kernel@...r.kernel.org Subject: Re: Stupid user with user-space questions, matrix LED driving with user space code only. Jonathan Andrews <jon <at> jonshouse.co.uk> writes: > > What about a yield alignment mechanism for user space. IE the process > calls the kernel with a request "schedule me first after a yeild" - then > the process at least has whatever the timer granularity is to do > something timing critical... add a flag to ignore or defer interrupts > and you have a semi 'hard-realtime' behaviour for user space, allowing > user space to grab small chunks of real time. Yes a nasty looking > facility for SMP intel servers but really useful for embedded. > Seems you have some (bad?) habits from embedded programming, you think Linux is FreeRTOS ;) Linux as such, as far as I read, is not a real-time OS, it will NOT do what you want in userspace, (maybe unless you build it with the RT patchset?) Better take the advice and go build a kernel driver for this display. Or use a small microcontroller that won't have the limitations. > Thanks, > Jon > > Lukasz -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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