The Design and Implementation of the Anykernel and Rump Kernels

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A–20 RUMP_ETFS(3) NetBSD Library Functions Manual RUMP_ETFS(3) NAME rump_etfs -- rump host file system interface LIBRARY rump kernel (librump, -lrump) SYNOPSIS #include int rump_pub_etfs_register(const char *key, const char *hostpath, enum rump_etfs_type ftype); int rump_pub_etfs_register_withsize(const char *key, const char *hostpath, enum rump_etfs_type ftype, uint64_t begin, uint64_t size); int rump_pub_etfs_remove(const char *key); DESCRIPTION The rump ExtraTerrestrial File System (rump_etfs) is used to provide access to the host file system namespace within a rump kernel. The operation is based on registered key values which each map to a hostpath. A key must be an absolute path (i.e. begin with ‘‘/’’). Multiple leading slashes are collapsed to one (i.e. ‘‘/key’’ is the same as ‘‘//key’’). The rest of the path, including slashes, is compared verbatim (i.e. ‘‘/key/path’’ does not match ‘‘/key//path’’). The hostpath is interpreted in host system context for the current work- NetBSD 5.99.48 February 3, 2011 NetBSD 5.99.48
A–21 RUMP_ETFS(3) NetBSD Library Functions Manual RUMP_ETFS(3) ing directory and can be either absolute or relative. The ftype parameter specifies how etfs file will be presented and does not have to match the host type, although some limitations apply. Possible values are: RUMP_ETFS_REG regular file. RUMP_ETFS_BLK block device. This is often used when mapping file system images. RUMP_ETFS_CHR character device. RUMP_ETFS_DIR directory. This option is valid only when hostpath is a directory. The immediate children of the host directory will be accessible inside a rump kernel. RUMP_ETFS_DIR_SUBDIRS directory. This option is valid only when hostpath is a directory. This option recursively applies to all subdirectories, and allows a rump kernel to access an entire directory tree. The interfaces are: rump_pub_etfs_register(key, hostpath, ftype) Map key to a file of type ftype with the contents of hostpath. rump_pub_etfs_register_withsize(key, hostpath, ftype, begin, size) Like the above, but map only [begin, begin+size] from hostpath. NetBSD 5.99.48 February 3, 2011 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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Page 258 and 259: 256 Art of Virtualization. In: Proc
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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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B-18 golem> rump.ifconfig virt0 cre
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B-20 Congratulations, that’s it.
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B-22 purely in userspace, it does n
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B-24 We then proceed to create a mo
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B-26 Then, the only thing left is t
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B-28 -d key=/dk,hostpath=${NFSX}/ff
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B-30 configuration. golem> sh rumpn
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B-32
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C-2 This is a quick fix for making
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C-4 This fixes the conditionally co
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