The Design and Implementation of the Anykernel and Rump Kernels

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A–42 UKFS(3) NetBSD Library Functions Manual UKFS(3) ciated with ukfs. The return value signals the return value of the unmount operation. If non-zero, ukfs will continue to remain valid. The possible values for flags are: UKFS_RELFLAG_NOUNMOUNT Do not unmount file system, just release ukfs handle. Release always succeeds. UKFS_RELFLAG_FORCE Forcefully unmount the file system. This means that any busy nodes (due to e.g. ukfs_chdir()) will be ignored. Release always succeeds. OPERATION int ukfs_chdir(struct ukfs *ukfs, const char *path) int ukfs_getdents(struct ukfs *ukfs, const char *dirname, off_t *off, uint8_t *buf, size_t bufsize) ssize_t ukfs_read(struct ukfs *ukfs, const char *filename, off_t off, uint8_t *buf, size_t bufsize) ssize_t ukfs_write(struct ukfs *ukfs, const char *filename, off_t off, uint8_t *buf, size_t bufsize) int ukfs_create(struct ukfs *ukfs, const char *filename, mode_t mode) NetBSD 5.99.48 November 22, 2009 NetBSD 5.99.48
A–43 UKFS(3) NetBSD Library Functions Manual UKFS(3) int ukfs_mknod(struct ukfs *ukfs, const char *path, mode_t mode, dev_t dev) int ukfs_mkfifo(struct ukfs *ukfs, const char *path, mode_t mode) int ukfs_mkdir(struct ukfs *ukfs, const char *filename, mode_t mode) int ukfs_remove(struct ukfs *ukfs, const char *filename) int ukfs_rmdir(struct ukfs *ukfs, const char *filename) int ukfs_link(struct ukfs *ukfs, const char *filename, const char *f_create) int ukfs_symlink(struct ukfs *ukfs, const char *filename, const char *linkname) ssize_t ukfs_readlink(struct ukfs *ukfs, const char *filename, char *linkbuf, size_t buflen) int ukfs_rename(struct ukfs *ukfs, const char *from, const char *to) int ukfs_stat(struct ukfs *ukfs, const char *filename, struct stat NetBSD 5.99.48 November 22, 2009 NetBSD 5.99.48
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Department of Computer Science and
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9 Preface Meet the new boss Same as
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11 Then there is my dear Xi, who, s
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14 2.3.3 InterruptsandPreemption...
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16 4.1.1 Implementation Effort ....
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18 Appendix C Patches to the 5.99.4
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20 ISA LGPL LRU LWP MD MI MMU NIC O
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23 List of Figures 2.1 Rumpkernelhi
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25 4.14 Time to execute 5M system c
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29 1 Introduction In its classic ro
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31 and application-level drivers. T
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33 We define an anykernel to be an
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35 Our implementation supports rump
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37 The project was done in small in
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39 2 The Anykernel and Rump Kernels
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41 building on top of the entities
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43 Drivers in a rump kernel remain
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45 Figure 2.1: Rump k
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47 in Section 3.2.3. Whenever discu
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49 int rumpns_bpfopen(dev_t, int, i
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51 Figure 2.4:
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53 while the application logic stil
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55 We must solve the lack of a rump
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57 2.3.1 Kernel threads Up until no
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59 void * pool_cache_get_paddr(pool
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61 2.3.4 An Example We present an e
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63 Figure 2.6: Prov
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65 The straightforward use of exist
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68 We identified three obstacles fo
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70 for loadable kernel modules (dis
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72 e.g. the routine for mapping a p
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74 3.2.1 C Symbol Namespaces In the
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76 the double underscore namespace
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78 since the representation might n
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80 The following rumpuser interface
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82 The entry point rump_schedule()
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84 3.3.1 CPU Scheduling Recall from
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86 The fastpath is taken in cases w
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88 Releasing a CPU requires the fol
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90 10 8 seconds 6 4 2 0 1CPU 2CPU n
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92 Hardware interrupt handlers are
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94 Due to the design choice that a
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96 in. Therefore, we should critica
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98 Pager window create+access time
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100 A rump kernel can be configured
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102 Since all pages managed by the
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104 not in control of thread schedu
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106 synchronization part of the alg
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108 /* * Run a cross call to cycle
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110 kernel needs to do is make sure
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112 The kernel with uniprocessor lo
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114 the header file while open() c
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116 The same wrapper works both for
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118 5. Some calling conventions (e.
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120 int rump_pub_lwproc_rfork(int a
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122 By convention, file system devi
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124 ule directory tree from /stand
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126 After these steps have been per
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128 Host Dynamic Linker Using the h
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130 for (i = 0; i < SYS_NSYSENT; i+
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132 into a rump kernel and the driv
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134 sys/arch/x86/include/cpu.h: #de
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136 3.8.4 Rump Component Init Routi
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138 RUMP_COMPONENT(RUMP_COMPONENT_N
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140 We have three distinct cases we
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142 # ifconfig tap0 create # ifconf
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144 Unprivileged use of host’s ne
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146 DOMAIN_DEFINE(sockindomain); co
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148 issue another write before the
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150 using an interface called USBDI
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152 The kernel device configuration
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154 # $NetBSD: UMASS.ioconf,v 1.4 2
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156 USB Host Controller Hub0 (root)
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158 Figure 3.30: File s
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160 in-kernel mount: /dev/sd0e /m/u
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162 structure being created by rump
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164 3.12.1 Client-Kernel Locators B
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166 A tmpfs server listening on INA
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168 Request Arguments Response Desc
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170 Host syscall rump syscall 1. op
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172 A client’s initial connection
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174 their system calls to a rump ke
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176 stdin/stdout, the new file desc
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178 Supporting fork() Recall, the f
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180 As with fork, most of the kerne
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182 Anecdotal analysis For several
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184
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186 SLOC 8000 7000 6000 5000 4000 3
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188 Total commits to the kernel 9,6
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190 120 build time (minutes) 100 80
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192 4.2.2 makefs For a source tree
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194 not include later debugging [76
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196 the necessary tools such as mak
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198 proach of supplying alternate c
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200 are not out-of-the-box compatib
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202 golem> mount -t msdos -o rump /
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204 Full OS By a full OS we mean a
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206 • Rapid prototyping: One of t
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208 4.5.3 Testing: Case Studies We
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210 static void scsitest_request(st
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212 waits for the timeout and check
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214 • We noticed that even in sup
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216 which were discovered during wr
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218 version swap no swap NetBSD 5.1
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220 It needs to be stressed that Ta
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222 Network clusters Bootstrapping
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224 8 7 Standard components Self-co
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226 Rump kernel calls, as expected,
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228 Traditional FFS We measure the
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230 80 70 60 seconds 50 40 30 20 10
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232 The results are presented in Fi
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234 behavior is required by the act
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236
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238 Rialto [29] is an operating sys
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240 One argument for partitioned op
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242 View OS The View OS [37] approa
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244 OSKit Instead of making system
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246 discussing the type incompatibi
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248 difference to the abovementione
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250 At runtime, a rump kernel can a
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252 For testing and development we
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254
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256 Art of Virtualization. In: Proc
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258 [30] Adam Dunkels. 2001. Design
Page 262 and 263: 260 [47] Galen C. Hunt and James R.
Page 264 and 265: 262 [67] Steven McCanne and Van Jac
Page 266 and 267: 264 [87] NetBSD Project. URL http:/
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Page 272 and 273: A-2 RUMP.DHCPCLIENT(1) NetBSD Gener
Page 274 and 275: A-4 RUMP.HALT(1) NetBSD General Com
Page 276 and 277: A-6 RUMP_SERVER(1) NetBSD General C
Page 278 and 279: A-8 RUMP_SERVER(1) NetBSD General C
Page 280 and 281: A-10 SHMIF_DUMPBUS(1) NetBSD Genera
Page 282 and 283: A-12 P2K(3) NetBSD Library Function
Page 284 and 285: A-14 P2K(3) NetBSD Library Function
Page 286 and 287: A-16 RUMP(3) NetBSD Library Functio
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Page 290 and 291: A-20 RUMP_ETFS(3) NetBSD Library Fu
Page 292 and 293: A-22 RUMP_ETFS(3) NetBSD Library Fu
Page 294 and 295: A-24 RUMP_LWPROC(3) NetBSD Library
Page 296 and 297: A-26 RUMP_LWPROC(3) NetBSD Library
Page 298 and 299: A-28 RUMPCLIENT(3) NetBSD Library F
Page 300 and 301: A-30 RUMPCLIENT(3) NetBSD Library F
Page 302 and 303: A-32 RUMPHIJACK(3) NetBSD Library F
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Page 318 and 319: A-48 SHMIF(4) NetBSD Kernel Interfa
Page 320 and 321: A-50 RUMP_SP(7) NetBSD Miscellaneou
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Page 324 and 325: B-2 TCP connections use standard TC
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Page 328 and 329: B-6 ponents. That can be done simpl
Page 330 and 331: B-8 Our goal is to add another part
Page 332 and 333: B-10 golem> export RUMP_SERVER=unix
Page 334 and 335: B-12 golem> rump.dd if=/dev/rcgd0d
Page 336 and 337: B-14 demogorgon# cgdconfig cgd0 /de
Page 338 and 339: B-16 rump_server -lrumpnet -lrumpne
Page 340 and 341: B-18 golem> rump.ifconfig virt0 cre
Page 342 and 343: B-20 Congratulations, that’s it.
Page 344 and 345: B-22 purely in userspace, it does n
Page 346 and 347: B-24 We then proceed to create a mo
Page 348 and 349: B-26 Then, the only thing left is t
Page 350 and 351: B-28 -d key=/dk,hostpath=${NFSX}/ff
Page 352 and 353: B-30 configuration. golem> sh rumpn
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Page 356 and 357: C-2 This is a quick fix for making
Page 358 and 359: C-4 This fixes the conditionally co
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Aalto-DD 171/2012 9HSTFMG*aejbgi+ I
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