Fri Jan 13 05:45:46 2017 UTC ()
Remove items that were in -6.


(dholland)
diff -r1.11 -r1.12 src/doc/roadmaps/system
cvs diff -r1.11 -r1.12 src/doc/roadmaps/system (expand / switch to unified diff)

--- src/doc/roadmaps/system 2012/01/15 06:53:23 1.11
+++ src/doc/roadmaps/system 2017/01/13 05:45:46 1.12
@@ -1,68 +1,36 @@ @@ -1,68 +1,36 @@
1$NetBSD: system,v 1.11 2012/01/15 06:53:23 dholland Exp $ 1$NetBSD: system,v 1.12 2017/01/13 05:45:46 dholland Exp $
2 2
3NetBSD System Roadmap 3NetBSD System Roadmap
4===================== 4=====================
5 5
6This is a small roadmap document, and deals with the main system 6This is a small roadmap document, and deals with the main system
7aspects of the operating system. 7aspects of the operating system.
8 8
9The following projects will appear in NetBSD 6.0: 9The following elements, projects, and goals will appear in NetBSD 8.0:
101. 64-bit time values supported 
112. Better Kernel Modules support 
125. namei() tactical changes 
139. namei() strategic changes 
1410. emap (ephemeral mapping) support for i386 and amd64 
1511. support for mDNSResponder 
16 10
17The following projects may make it into future releases: 11The following projects may make it into future releases:
183. Full kernel preemption for real-time threads 123. Full kernel preemption for real-time threads
194. POSIX shared memory 134. POSIX shared memory
206. Better resource controls 146. Better resource controls
217. Improved observability: online crashdumps, remote debugging 157. Improved observability: online crashdumps, remote debugging
228. Processor and cache topology aware scheduler 168. Processor and cache topology aware scheduler
23 17
24We'll continue to update this roadmap as features and dates get firmed up. 18We'll continue to update this roadmap as features and dates get firmed up.
25 19
26 20
27Some explanations 21Some explanations
28================= 22=================
29 23
301. 64-bit time_t support 
31------------------------- 
32 
33The Unix 32-bit time_t value will overflow in 2037 - any mortgage calculations 
34which use a time_t value are in danger of overflowing at the present time - 
35and to address this, 64-bit time_t values will be used to contain the number 
36of seconds since 1970. This was completed in 5.99.7 by Christos (with no libc 
37major bump - kudos and respect), and will be in 6.0. 
38 
39Responsible: christos 
40 
41 
422. Better Kernel Module Support 
43------------------------------- 
44 
45Starting with 5.99.2, the kernel support for modules was enhanced by 
46ad, and GENERIC was switched over to be a MODULAR kernel. Support 
47from booting from modules, like ffs, was introduced at the same time.  
48Some work has been done by Luke Mewburn in this area to define module 
49locations and paths so that effective kernel development can be done 
50using modules. Kernel modules have been moved out of base.tgz and a new 
51modules.tgz has been created. 
52 
53Responsible: ad, lukem 
54 
55 
563. Full kernel preemption for real-time threads on non-x86 243. Full kernel preemption for real-time threads on non-x86
57---------------------------------------------------------- 25----------------------------------------------------------
58 26
59With the revamp of the kernel concurrency model, much of the kernel is 27With the revamp of the kernel concurrency model, much of the kernel is
60fully multi-threaded and can therefore be preempted at any time. In 28fully multi-threaded and can therefore be preempted at any time. In
61support of lower context switch and dispatch times for real-time 29support of lower context switch and dispatch times for real-time
62threads, full kernel preemption is being implemented. This has been 30threads, full kernel preemption is being implemented. This has been
63implemented already for i386 and x86_64 (and is in 5.0), but needs to 31implemented already for i386 and x86_64 (and is in 5.0), but needs to
64be extended to support ARM and other ports. MIPS has this, as does 32be extended to support ARM and other ports. MIPS has this, as does
65PowerPC, but it is not yet enabled. 33PowerPC, but it is not yet enabled.
66 34
67Responsible: rmind 35Responsible: rmind
68 36
@@ -70,37 +38,26 @@ Responsible: rmind @@ -70,37 +38,26 @@ Responsible: rmind
704. POSIX shared memory 384. POSIX shared memory
71---------------------- 39----------------------
72 40
73Implement POSIX shared memory facilities, which can be used to create 41Implement POSIX shared memory facilities, which can be used to create
74the shared memory objects and add the memory locations to the address 42the shared memory objects and add the memory locations to the address
75space of a process. Changes were proposed on tech-kern, although 43space of a process. Changes were proposed on tech-kern, although
76there were some concerns with the kernel implementation, and so a 44there were some concerns with the kernel implementation, and so a
77different approach using wrapper functions on tmpfs is being aimed at 45different approach using wrapper functions on tmpfs is being aimed at
78for 6.0. 46for 6.0.
79 47
80Responsible: rmind 48Responsible: rmind
81 49
82 50
835. Incremental namei improvements, Phase 1 
84------------------------------------------ 
85 
86In NetBSD 5.99.15, some changes were made to split the namei() routine 
87up into logical parts, so that changes can be made to the constituent 
88parts in a less intrusive way. This is in the repository now, and will 
89be in 6.0. 
90 
91Responsible: dholland 
92 
93 
946. Better resource controls 516. Better resource controls
95--------------------------- 52---------------------------
96 53
97A resource provisioning and control framework that extends beyond the 54A resource provisioning and control framework that extends beyond the
98traditional Unix process limits. 55traditional Unix process limits.
99 56
100Responsible: TBD 57Responsible: TBD
101 58
102 59
1037. Improved observability: online crashdumps, remote debugging 607. Improved observability: online crashdumps, remote debugging
104-------------------------------------------------------------- 61--------------------------------------------------------------
105 62
106XXX crashdumps while the system is running 63XXX crashdumps while the system is running
@@ -112,43 +69,15 @@ Responsible: TBD @@ -112,43 +69,15 @@ Responsible: TBD
1128. Processor and cache topology aware scheduler 698. Processor and cache topology aware scheduler
113----------------------------------------------- 70-----------------------------------------------
114 71
115Implement the detection of the topology of the processors and caches.  72Implement the detection of the topology of the processors and caches.
116Improve the scheduler to make decisions about thread migration 73Improve the scheduler to make decisions about thread migration
117according to the topology, to get better thread affinity and less 74according to the topology, to get better thread affinity and less
118cache thrashing, and thus improve overall performance in modern SMP 75cache thrashing, and thus improve overall performance in modern SMP
119systems. Code has been written, but did not show any performance 76systems. Code has been written, but did not show any performance
120improvement. We will continue to monitor this area. 77improvement. We will continue to monitor this area.
121 78
122Responsible: rmind 79Responsible: rmind
123 80
124 81
1259. Incremental namei improvements, Phase 2 
126------------------------------------------ 
127 
128Building on the namei() split which was introduced in 5.99.15 (see (5) 
129above), further changes will be introduced: see the changes to namei 
130outlined in Message-ID: <20080319053709.GB3951@netbsd.org> for more 
131information. This will simplify the locking and behavior of namei() 
132calls within the kernel to resolve path names within file systems. 
133 
134Responsible: dholland 
135 
136 
13710. Ephemeral Mapping 
138--------------------- 
139 
140Responsible: rmind 
141 
142 
14311. Multicast DNS and DNS Service Discovery 
144------------------------------------------- 
145 
146mDNSResponder (also known as mdnsd on some systems) is a daemon invoked 
147at boot time to implement Multicast DNS and DNS Service Discovery. On Mac 
148OS X 10.6 (Snow Leopard), mDNSResponder is also the system-wide Unicast 
149DNS Resolver. Ty Sarna added support for mdnsd to NetBSD-current, and it 
150will appear in NetBSD 6.0. 
151 
152 
153Alistair Crooks 82Alistair Crooks
154Sat Jan 14 11:40:49 PST 2012 83Sat Jan 14 11:40:49 PST 2012