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Linux 2.4 VM Documentation 115

Posted by michael
from the virtual-documentation dept.
popoutman writes "Mel Gorman has announced the availability of a guide to the 2.4 kernel VM including a walkthrough of the VM code. Anyone interested in obtaining a solid understanding of the Linux 2.4 VM will certainly want to take a look at this documentation. Mel says that the effort is at least several weeks from being finished, but that he's releasing it now with the hopes of getting feedback to be sure he's on the right track. He also notes that the 2.5 VM is still too much of a moving target for him to document it just yet." See also a Kerneltrap story.
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Linux 2.4 VM Documentation

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  • by oliverthered (187439) <oliverthered AT hotmail DOT com> on Wednesday January 15, 2003 @12:58PM (#5088806) Journal
    We design aned document things first, work out the bugs in the high level design and then code.

    Well maybe not all the time and with serveral itterations, but I only manage your credit raiting, not you kernel VM.
  • by Anonymous Coward on Wednesday January 15, 2003 @01:02PM (#5088829)
    Choose one :

    VM = Value Management
    VM = Variable Metric
    VM = Velocity Management
    VM = Velocity Meter
    VM = Velocity Modulation
    VM = Version Manager
    VM = VIBE Magazine
    VM = Video Monitor
    VM = Vietnam (Socialist Republic of Vietnam)
    VM = View Mail (Emacs)
    VM = Virtual Machine
    VM = Virtual Madness
    VM = Virtual Memory
    VM = Vivamos Mejor (Let Us Live Better; Guatemalan agency)
    VM = Voice Mail
    VM = Voice Message
    VM = Voice Modulation
    VM = Voltmeter

    but not that one!!!
  • by syle (638903) <syle@nospaM.waygate.org> on Wednesday January 15, 2003 @01:06PM (#5088849) Homepage
    ...that virtual memory works because of small, magical faeries and gnomes.
  • by sporadek (639621) on Wednesday January 15, 2003 @01:50PM (#5089145) Homepage
    As a tip for best results I suggeest using the Extreme Documentation method when writing your docs, it's saved time on the order of Olog(n) for me and a proven time saving technique.

    Define your function "Olog", please. Surely Mr. "Wagner LLC Consulting Co. - Getting it right the first time" couldn't have meant O(log n)... :)

  • Re:JVM (Score:5, Funny)

    by axxackall (579006) on Wednesday January 15, 2003 @02:34PM (#5089434) Homepage Journal
    yeah, right. let's also integrate to the kernel Perl, Python, Tcl, Lua, Emacs (for Elisp), Guile, Hugs, OCAML, Bash, Apache (for PHP) and Gecko (I want my Mozilla to work faster too!). I wonder, why is X server still not there? And don't forget about at least two CORBA brokers: Gnorba (everyone would love faster Gnome) and OmniOrb (just for a case). Hey, let's put everything into the kernel! Ooops... It's not kernel anymore and it doesn't want to run either. What was the mistake?
  • by FroMan (111520) on Wednesday January 15, 2003 @02:41PM (#5089475) Homepage Journal
    How would this be modded informative... I'd like to meta-meta mod that moderation to +1 Funny along with this post as +1 Funny.
  • Re:JVM (Score:5, Funny)

    by PetiePooo (606423) on Wednesday January 15, 2003 @04:28PM (#5090174)
    I suspect it would be a waste of your time. Lets look at a bit of history.

    There used to be a kernel-space HTTP server. It was integrated into the kernel for a specific reason: zero-copy access to the network interface memory. It was fast and relatively feature-poor. If it crashed (fortunately, a rare occurance), you got a kernel panic.
    Along came a user-space, zero-copy HTTP server. It was faster and had a few more features to boot. Being a user-space program, if it crashed, you got a core-dump. It could also be run in a chroot jail, a gigantic step more secure than running in ring-0.

    Two lessons can be read from this:
    1. Don't integrate something with the kernel unless there is a specific advantage you hope to gain from it. Will making a JVM part of the kernel really speed it up? Are you sure?
    2. Don't under-estimate the speed of a properly designed user-space Linux program. The kernel developers have done a magnificant job tuning the kernel and providing APIs for performance-critical apps.
  • Re:JVM (Score:4, Funny)

    by CableModemSniper (556285) <.moc.liamg. .ta. .odlapacnagol.> on Wednesday January 15, 2003 @04:52PM (#5090325) Homepage Journal
    OMG! You've reverse-engineered windows!
  • by ghassanm (130547) on Wednesday January 15, 2003 @08:54PM (#5091770)
    2.1.2 Browsing the Code

    Generally, related operations are clustered together in the same file and there is not much copulation between modules.

    I hope the discovery channel will do a special on copulating modules some day. I've seen module coupling but no copulation yet.
  • by Mel (21137) on Wednesday January 15, 2003 @10:00PM (#5091880) Homepage
    > I hope the discovery channel will do a special on copulating
    > modules some day. I've seen module coupling but no copulation yet

    Haven't you ever heard of sexy code? Is is meant to be taken literally, isn't it?

    (typo corrected in the work in progress version)

Nothing will dispel enthusiasm like a small admission fee. -- Kim Hubbard

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