144 lines
4.7 KiB
Plaintext
144 lines
4.7 KiB
Plaintext
$NetBSD: system,v 1.8 2009/11/17 21:09:54 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 already in NetBSD-current and will appear
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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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5. namei() tactical changes
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10. emap (ephemeral mapping) support for i386 and amd64
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11. support for mDNSResponder
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The following projects are expected to be included in NetBSD 6.0
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3. Full kernel preemption for real-time threads
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4. POSIX shared memory
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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. This was completed in 5.99.7 by Christos (with no libc
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major bump - kudos and respect), and will be in 6.0.
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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. Kernel modules have been moved out of base.tgz and a new
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modules.tgz has been created.
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Responsible: ad, lukem
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3. Full kernel preemption for real-time threads on non-x86
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----------------------------------------------------------
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With the revamp of the kernel concurrency model, much of the kernel is
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fully multi-threaded and can therefore be preempted at any time. In
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support of lower context switch and dispatch times for real-time
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threads, full kernel preemption is being implemented. This has been
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implemented already for i386 and x86_64 (and is in 5.0), but needs to
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be extended to support the ARM, MIPS and SuperH ports.
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Responsible: rmind
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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. This is in the repository now, and will
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be in 6.0.
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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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Building on the namei() split which was introduced in 5.99.15 (see (5)
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above), further changes will be introduced: see the changes to namei
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outlined in Message-ID: <20080319053709.GB3951@netbsd.org> for more
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information. This will simplify the locking and behavior of namei()
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calls within the kernel to resolve path names within file systems.
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Responsible: dholland
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10. Ephemeral Mapping
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---------------------
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Responsible: rmind
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11. Multicast DNS and DNS Service Discovery
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-------------------------------------------
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mDNSResponder (also known as mdnsd on some systems) is a daemon invoked
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at boot time to implement Multicast DNS and DNS Service Discovery. On Mac
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OS X 10.6 (Snow Leopard), mDNSResponder is also the system-wide Unicast
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DNS Resolver. Ty Sarna added support for mdnsd to NetBSD-current, and it
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will appear in NetBSD 6.0.
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Alistair Crooks
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Thu Nov 5 07:47:34 PST 2009
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