Dynamic Kernels: Modularized Device Drivers
The Kernel Korner columns of the following months will introduce further points of module-writing. Code samples can be found inside the kernel and on ftp sites near you.
In particular, what I describe is based on my personal experience with device drivers: both the ceddrv-0.xx and cxdrv-0.xx resemble the code I describe. Georg Zezschwitz and I wrote the ceddrv, which drives a lab interface (A/D, D/A, bells and whistles). The cxdrv driver is simpler, and drives a memory-mapped frame grabber. The latest versions of both drivers are available on ftp://iride.unipv.it/pub/linux for public ftp. ceddrv is also on tsx-11.mit.edu, while cxdev is on sunsite.unc.edu in apps/video.
There are quite a few books about device drivers out there, but they're often too system-specific and describe an awkward interface—Linux is easier. Generic books about Unix internals and the kernel source are the best teachers. I'd suggest to get one of the following:
Maurice J. Bach, The Design of the UNIX Operating System, Prentice Hall, 1986
Andrew S. Tanenbaum, Operating Systems: Design and Implementation, Prentice Hall, 1987
Andrew S. Tanenbaum, Modern Operating Systems, Prentice Hall, 1992
Alessandro Rubini (firstname.lastname@example.org) is taking his PhD course in computer science and is breeding two small Linux boxes at home. Wild by his very nature, he loves trekking, canoeing, and riding his bike.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide