A summary of Linux real-time approaches (Part D)

Click here to learn
about this Sponsor:

Home | News | Articles | Polls | Forum

Keywords: Match:

(conclusion)

D. SUMMARY

At this point, it does not appear that any one approach can be all things to all realtime applications. It is therefore too early to pick a winner. Advocates of a given approach are therefore advised to concentrate their energy on implementations of their favorite approach, rather than engaging in flamewars with advocates of other approaches. ;-)

After all, in the end, the approaches that best meet the needs of the user community will win out. In fact, given that the Linux community has come up with no fewer than seven classes of solutions to a problem that is commonly thought to be unsolvable, it seems quite reasonable to expect that yet more classes of solutions will yet appear.

So, which of these approaches can be combined? The first three can be thought of as elaborations on the general preemption theme, and can be combined with each of the remaining four. The nested-OS and dual-OS/dual-core ideas can be combined by having one of the OSes on one of the cores have another OS nested within it. The dual-core/dual-OS approach can be combined with either of the migration approaches, simply by having one of the cores implement the migration approach. It should be possible to combine the two migration approaches, though it is not clear that this is useful.

Regardless of whether Linux's direction ends up being a single one of these approaches, a yet-as-unknown approach, or some combination, realtime Linux looks to remain an exciting area.

About the author -- Paul E. McKenney is a distinguished engineer at IBM and has worked on SMP, NUMA, and RCU algorithms for longer than he cares to admit. Prior to that, he worked on packet-radio and Internet protocols (but long before the Internet became popular), system administration, realtime systems, and even business applications. His hobbies include running and the usual house-wife-and-kids habit.

Talk Back!

Questions or comments? Talkback here

Story Navigation

Related Stories

(Click here for further information)

7 Advantages of D2D Backup
For decades, tape has been the backup medium of choice. But, now, disk-to-disk (D2D) backup is gaining in favor. Learn why you should make the move in this whitepaper.

4 Legal Reasons to Control Internet Access
The Internet is obviously a valuable resource for many organizations. However, many are exposed to legal liability concerns because they fail to control Internet access. Learn if you're safe in this white paper.

Rapidly Resolve J2EE Application Problems
Whether you are in the process of building J2EE applications or have J2EE applications already running in production, you must ensure that they deliver the expected ROI. Learn how in this white paper.

Load Testing 2.0 for Web 2.0
There are many unknowns in stress testing Web 2.0 applications. Find out how to test the performance of Web 2.0 in this white paper.

Build Better Games Online
For the game infrastructure providers, life is complex. Making money from games has become more complicated. Why? Find out in this white paper.

Building a Virtual Infrastructure from Servers to Storage
This white paper discusses the virtual storage solutions that reduce cost, increase storage utilization, and address the challenges of backing up and restoring Server environments.

Gaining Faster Wireless Connections with WiMAX
Welcome to what is quickly becoming the hyperconnected world where anything that would benefit from being connected to the network will be connected. Learn more in this white paper.

Is Your Desktop a Security Threat?
The new wave of sophisticated crimeware not only targets specific companies, but also targets desktops and laptops as backdoor entryways into those business’ operations and resources. Learn how to stay safe in this white paper.

Increasing SAN Reliability by 100 Percent
Storage area networks (SAN) are a strong part of storage plans. Learn how to increase your reliability and uptime by 100 percent in this case study.

Got a HOT tip? please tell us!

Click here for a profile of each sponsor:

PLATINUM SPONSORS
<a href="http://ad.doubleclick.net/jump/entzd.linuxdevices/desktop;kw=timesys;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?"" style="border-width:0px;height:150px;width:30px;"><img src="http://ad.doubleclick.net/ad/entzd.linuxdevices/desktop;kw=timesys;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?" style="border:0; height: 150; width:30;" /></a>		<a href="http://ad.doubleclick.net/jump/entzd.linuxdevices/desktop;kw=windriver;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?"" style="border-width:0px;height:150px;width:30px;"><img src="http://ad.doubleclick.net/ad/entzd.linuxdevices/desktop;kw=windriver;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?" style="border:0; height: 150; width:30;" /></a>

<a href="http://ad.doubleclick.net/jump/entzd.linuxdevices/desktop;kw=versalogic;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?"" style="border-width:0px;height:150px;width:30px;"><img src="http://ad.doubleclick.net/ad/entzd.linuxdevices/desktop;kw=versalogic;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?" style="border:0; height: 150; width:30;" /></a>		<a href="http://ad.doubleclick.net/jump/entzd.linuxdevices/desktop;kw=winsystems;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?"" style="border-width:0px;height:150px;width:30px;"><img src="http://ad.doubleclick.net/ad/entzd.linuxdevices/desktop;kw=winsystems;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?" style="border:0; height: 150; width:30;" /></a>

<a href="http://ad.doubleclick.net/jump/entzd.linuxdevices/desktop;kw=virtuallogix;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?"" style="border-width:0px;height:150px;width:30px;"><img src="http://ad.doubleclick.net/ad/entzd.linuxdevices/desktop;kw=virtuallogix;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?" style="border:0; height: 150; width:30;" /></a>		<a href="http://ad.doubleclick.net/jump/entzd.linuxdevices/desktop;kw=trolltech;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?"" style="border-width:0px;height:150px;width:30px;"><img src="http://ad.doubleclick.net/ad/entzd.linuxdevices/desktop;kw=trolltech;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?" style="border:0; height: 150; width:30;" /></a>

<a href="http://ad.doubleclick.net/jump/entzd.linuxdevices/desktop;kw=montavista;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?"" style="border-width:0px;height:150px;width:30px;"><img src="http://ad.doubleclick.net/ad/entzd.linuxdevices/desktop;kw=montavista;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?" style="border:0; height: 150; width:30;" /></a>		<a href="http://ad.doubleclick.net/jump/entzd.linuxdevices/desktop;kw=technicalsolutions;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?"" style="border-width:0px;height:150px;width:30px;"><img src="http://ad.doubleclick.net/ad/entzd.linuxdevices/desktop;kw=technicalsolutions;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?" style="border:0; height: 150; width:30;" /></a>

GOLD SPONSORS
<a href="http://ad.doubleclick.net/jump/entzd.linuxdevices/desktop;kw=ultimate;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?"" style="border-width:0px;height:150px;width:30px;"><img src="http://ad.doubleclick.net/ad/entzd.linuxdevices/desktop;kw=ultimate;pos=top;dcopt=ist;zdid=a221772;tile=1;sz=150x30;ord=<script=JavaScript>document.write(Math.round(Math.random()10000000000));</script>?" style="border:0; height: 150; width:30;" /></a>		(Become a sponsor)

ADVERTISEMENT
(Advertise here)

Check out the latest Linux powered...

mobile phones!

other cool
gadgets

BREAKING NEWS

• Linux-friendly SoCs target low-end multimedia
• CompactFlash as a COTS "standard"
• 65nm ARM9 SoCs target PNDs, smartphones
• Motorola Ming A1600 ships
• N810 gains Android installer
• PC/104-Plus board runs Linux on x86 SoC
• Webinars explore embedded Linux development
• Linux video camera geo-tags, writes to SATA drives
• Garmin Nav devices run Gnome Linux
• Ten LiMo phones this month?
• It's a Yankee Doodle Linux phone
• Wind River to host "Developer Day"
• Dev boards gain Linux support
• 802.11n zooms ahead
• Low-power mini-ITX board runs Linux

Linux-Watch headlines:
• Microsoft tactics push India toward Linux
• Bell, SuperMicro sued over GPL
• "Business intelligence" software goes GPL
• Will Atom bomb?
• LF Summit videos posted
• Linux gains "embedded" maintainers
• Virtualization on tap in SLES and RHEL upgrades
• Linux gets security black eye
• Verizon chooses Linux "platform of choice"
• Hats off to Fedora 9

Also visit our sister site:

Sign up for LinuxDevices.com's...

news feed

Home \| News \| Articles \| Polls \| Forum \| About \| Contact

	Ziff Davis Enterprise Home \| Contact Us \| Advertise \| Link to Us \| Reprints \| Magazine Subscriptions \| Newsletters Tech RSS Feeds \| White Papers \| ROI Calculators \| Tech Podcasts \| Tech Video \| VARs \| Channel News
	Baseline \| Careers \| Channel Insider \| CIO Insight \| DesktopLinux \| DeviceForge \| DevSource \| eSeminars \| eWEEK \| Enterprise Network Security \| LinuxDevices \| Linux Watch \| Microsoft Watch \| Mid-market \| Networking \| PDF Zone \| Publish \| Security IT Hub \| Strategic Partner \| Web Buyer's Guide \| Windows for Devices
	Developer Shed \| Dev Shed \| ASP Free \| Dev Articles \| Dev Hardware \| SEO Chat \| Tutorialized \| Scripts \| Code Walkers \| Web Hosters \| Dev Mechanic \| Dev Archives \| igrep
Use of this site is governed by our Terms of Service and Privacy Policy. Except where otherwise specified, the contents of this site are copyright © 1999-2008 Ziff Davis Enterprise Holdings Inc. All Rights Reserved. Reproduction in whole or in part in any form or medium without express written permission of Ziff Davis Enterprise is prohibited. Linux is a registered trademark of Linus Torvalds. All other marks are the property of their respective owners.

Home \| News \| Articles \| Polls \| Forum \| About \| Contact

	Ziff Davis Enterprise Home \| Contact Us \| Advertise \| Link to Us \| Reprints \| Magazine Subscriptions \| Newsletters Tech RSS Feeds \| White Papers \| ROI Calculators \| Tech Podcasts \| Tech Video \| VARs \| Channel News
	Baseline \| Careers \| Channel Insider \| CIO Insight \| DesktopLinux \| DeviceForge \| DevSource \| eSeminars \| eWEEK \| Enterprise Network Security \| LinuxDevices \| Linux Watch \| Microsoft Watch \| Mid-market \| Networking \| PDF Zone \| Publish \| Security IT Hub \| Strategic Partner \| Web Buyer's Guide \| Windows for Devices
	Developer Shed \| Dev Shed \| ASP Free \| Dev Articles \| Dev Hardware \| SEO Chat \| Tutorialized \| Scripts \| Code Walkers \| Web Hosters \| Dev Mechanic \| Dev Archives \| igrep
Use of this site is governed by our Terms of Service and Privacy Policy. Except where otherwise specified, the contents of this site are copyright © 1999-2008 Ziff Davis Enterprise Holdings Inc. All Rights Reserved. Reproduction in whole or in part in any form or medium without express written permission of Ziff Davis Enterprise is prohibited. Linux is a registered trademark of Linus Torvalds. All other marks are the property of their respective owners.