ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel
  • »
  • Technology»
  • Computers & Software»
  • Operating Systems

What's New in Linux 3.14

Updated on March 31, 2014

Linux 3.14

Linux 3.14 was released on March 31st 2014, after the normal two months or so of development, the previous version having been released on January 20th. This version number is both an approximation of pi to two digits and a match for the month/year 3/14.

So much for trivia, what's new?

Source

Deadline scheduler

The deadline scheduler was finally merged for 3.14 after having been in development for several years. It offers real time systems another way to schedule tasks: instead of setting priorities, processes provide three parameters: runtime, period, and deadline.

Tasks are guaranteed an execution slice of length runtime every period length within deadline of the period start. So, for example, with runtime=1µs, period=100µs, deadline=10µs, the task would be guaranteed to get at least 1µs of execution time within the first 10µs of the period. Processes with a shorter/closer deadline will get executed first by the scheduler.

This should allow Linux to work better in hard realtime applications.

KASLR

KASLR is one of the more indecipherable acronyms out there. It stands for Kernel Address Space Layout Randomization. It's an implementation of ASLR for kernel memory, meaning that the physical and virtual addresses of kernel memory start at a random location.

The idea is to make certain exploits more difficult to run and more likely to cause random breakage that the administrator can detect. 64-bit installs benefit more from randomization due to the larger available address space.

zram

The zram memory compression system has been in staging for quite a while and is now considered stable. Google is using this in their Chrome OS, so anyone with a Chromebook or a Chromebox will probably already have it running:

Since Chrome OS was mentioned: the main reason why we don't use swap to a disk (rotating or SSD) is because it doesn't degrade gracefully and leads to a bad interactive experience. Generally we prefer to manage RAM at a higher level, by transparently killing and restarting processes. But we noticed that zram is fast enough to be competitive with the latter, and it lets us make more efficient use of the available RAM.

Contributors to 3.14

Company/Group
Changesets
Lines Changed
Intel
8.9%
10.0%
Red Hat
7.3%
6.7%
Linaro
4.4%
1.9%
Largest contributors by changesets according to Jonathan Corbet: http://lwn.net/Articles/590354/

Maintenance length

How long a particular kernel version gets stable updates depends on what it gets used for and who wants to support it. All releases get updates until the next release, which will be in some two months or a bit more. Greg KH maintains two longterm releases in addition, but the next one is only scheduled to be selected around October. Red Hat doesn't plan to use 3.14, so that avenue is also out.

Ubuntu is still a bit of an unknown. The next Ubuntu release will be out in a April, so they will probably stick with 3.13, but if they do upgrade to 3.14 before release, they will support 3.14 for five years.

Comments

    0 of 8192 characters used
    Post Comment

    No comments yet.

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: "https://hubpages.com/privacy-policy#gdpr"

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)