rcu

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Using Read-Copy-Update Techniques for System V IPC in the Linux 2.5 Kernel

Read-Copy Update RCU allows lock-free read-only access to data structures that are concurrently modified on SMP systems. Despite the concurrent modifications, read-only access requires neither locks nor atomic instructions, and can often be written as if the data were unchanging, in a "CS 101" style. RCU is typically applied to...

Tags: Implementation, Kernel, IBM Corp., RCU, Linux, UNIX, Operating Systems, Open Source, Software

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Additional Resources

SCO vs. IBM: clarity as push approaches shove

SCO vs. IBM: clarity as push approaches shoveEstoppelMurph, you misunderstand the key point of the "statute of limitations" issue. If AT&T had, indeed, intended that the contract prohibited IBM from publicly disclosing its own inventions (e.g. RCU), then they had the opportunity fifteen years ago to tell IBM not...

Tags: OPEN SOURCE, Operating systems, UNIX, SCO Group Inc., IBM Corp., Caldera Systems Inc., statute, Murph, Linux

Discussion threads 2007-03-12

SCO vs. IBM: clarity as push approaches shove

Just recently groklaw published both IBMs motion for summary judgement on SCOs contractual claims and SCOs rebuttal argument. The judge could rule on those today or later or this week, but the outcome is less interesting than the documents themselves because here, for the first time, both SCO...

Tags: General, Linux

Blog posts 2007-03-12

Is IBM open source's little friend?

Is IBM open source's little friend?Well, let's see...IBM contributions to Open Source?Postfix, RDC reusable dialog components for voice recognition, Websphere Application Server Community Edition WAS CE, IBM contributions to Linux: JFS, Kernel scheduler, RCU (read/copy/update), NUMA, plus grid and virtual machine concepts... Projects that IBM helps: Zend, Firefox, Dojo/AJAX...That's a...

Tags: UNIX, Operating systems, Well Let, IBM Corp., Linux, open source

Discussion threads 2006-08-22

Comparing code bases

Comparing code basesThe trouble isyour proposed comparison would do exactly what the legal standard rejects: compare functionality. Two implementations of the same specification would come up as similar.My favorite example is sort. I can write dozens of different implementations of gnu [b]sort[/b] with identical external behavior, yet they're...

Tags: Desktops, OPEN SOURCE, Operating systems, UNIX, Insurance, PC industry, AT&T Corp., Ritchie, patent

Discussion threads 2005-07-22

In defense of proprietary software

In defense of proprietary softwareProprietary software is useless! Trash it all!Dump Microsoft! It's pure garbage! Go with linux and save yourselves! Long live Dr. Torvalds! Praised be Dr. Torvalds!A surprising article....in that I couldn't figure out why anyone would write it. Proprietary software does not need defenders, as it...

Tags: Tools & Techniques, Application servers, Middleware, IBM WebSphere, software, open source, John Carroll, Linux, Microsoft Corp., Proprietary Software

Discussion threads 2003-12-16

RCU Vs. Locking Performance on Different CPUs

This paper fills the gap of comparing RCU to other locking techniques on a number of CPUs using a hash-lookup micro-benchmark. The read intensity, number of the CPUs, and number of searches/updates per grace period are varied to gain better insight into which tool is right for a particular job.

Tags: Performance, CPU, IBM Corp., Processors, Semiconductors, Hardware, Components

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Making RCU Safe for Deep Sub-Millisecond Response Realtime Applications

Linux has long been used for soft realtime applications. More recent work is preparing Linux for more aggressive realtime use, with scheduling latencies in the small number of hundreds of microseconds (that is right, microseconds, not milliseconds). The current Linux 2.6 RCU implementation both helps and hurts. It helps by...

Tags: Latency, Linux, UNIX, Open Source, Operating Systems, Software

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