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115 lines
3.5 KiB
Plaintext
115 lines
3.5 KiB
Plaintext
$NetBSD: system,v 1.6 2009/09/15 21:07:58 agc Exp $
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NetBSD System Roadmap
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=====================
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This is a small roadmap document, and deals with the main system
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aspects of the operating system.
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The following projects are expected to be included in NetBSD 6.0
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1. 64-bit time values supported
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2. Better Kernel Modules support
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3. Full kernel preemption for real-time threads
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4. POSIX shared memory
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5. namei() tactical changes
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6. Better resource controls
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7. Improved observability: online crashdumps, remote debugging
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8. Processor and cache topology aware scheduler
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9. namei() strategic changes
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We currently expect to branch 6.0 in the March 2010 timeframe, with a view
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to a 6.0 release later in 2010.
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We'll continue to update this roadmap as features and dates get firmed up.
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Some explanations
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=================
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1. 64-bit time_t support
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-------------------------
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The Unix 32-bit time_t value will overflow in 2037 - any mortgage calculations
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which use a time_t value are in danger of overflowing at the present time -
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and to address this, 64-bit time_t values will be used to contain the number
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of seconds since 1970.
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Responsible: christos
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2. Better Kernel Module Support
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-------------------------------
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Starting with 5.99.2, the kernel support for modules was enhanced by
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ad, and GENERIC was switched over to be a MODULAR kernel. Support
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from booting from modules, like ffs, was introduced at the same time.
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Some work has been done by Luke Mewburn in this area to define module
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locations and paths so that effective kernel development can be done
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using modules.
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Responsible: ad, lukem
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3. Full kernel preemption for real-time threads
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-----------------------------------------------
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With the revamp of the kernel concurrency model, much of the kernel is fully
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multi-threaded and can therefore be preempted at any time. In support of
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lower context switch and dispatch times for real-time threads, full kernel
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preemption is being implemented.
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4. POSIX shared memory
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----------------------
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Implement POSIX shared memory facilities, which can be used to create the
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shared memory objects and add the memory locations to the address space of
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a process.
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Responsible: rmind
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5. Incremental namei improvements, Phase 1
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------------------------------------------
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In NetBSD 5.99.15, some changes were made to split the namei() routine
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up into logical parts, so that changes can be made to the constituent
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parts in a less intrusive way.
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Responsible: dholland
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6. Better resource controls
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---------------------------
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A resource provisioning and control framework that extends beyond the
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traditional Unix process limits.
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7. Improved observability: online crashdumps, remote debugging
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--------------------------------------------------------------
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XXX crashdumps while the system is running
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XXX firewire support in libkvm
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8. Processor and cache topology aware scheduler
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-----------------------------------------------
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Implement the detection of the topology of the processors and caches.
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Improve the scheduler to make decisions about thread migration
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according to the topology, to get better thread affinity and less
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cache thrashing, and thus improve overall performance in modern SMP
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systems.
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Responsible: rmind
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9. Incremental namei improvements, Phase 2
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------------------------------------------
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Implement the rest of the changes to namei outlined in Message-ID:
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<20080319053709.GB3951@netbsd.org>. Simplify the locking and behavior
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of namei() calls within the kernel to resolve path names within file
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systems.
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Responsible: dholland
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Alistair Crooks
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Tue 15 Sep 2009 08:02:11 PDT
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