Mercurial > hg > graal-compiler
annotate src/os/solaris/vm/perfMemory_solaris.cpp @ 21818:5ca2ea5eeff0
Merge
| author | asaha |
|---|---|
| date | Fri, 31 Oct 2014 17:09:14 -0700 |
| parents | 833b0f92429a 60a992c821f8 |
| children | fb677d6aebea |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17707 | 2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/vmSymbols.hpp" | |
| 27 #include "memory/allocation.inline.hpp" | |
| 28 #include "memory/resourceArea.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 30 #include "os_solaris.inline.hpp" | |
| 31 #include "runtime/handles.inline.hpp" | |
| 32 #include "runtime/perfMemory.hpp" | |
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33 #include "services/memTracker.hpp" |
| 1972 | 34 #include "utilities/exceptions.hpp" |
| 0 | 35 |
| 36 // put OS-includes here | |
| 37 # include <sys/types.h> | |
| 38 # include <sys/mman.h> | |
| 39 # include <errno.h> | |
| 40 # include <stdio.h> | |
| 41 # include <unistd.h> | |
| 42 # include <sys/stat.h> | |
| 43 # include <signal.h> | |
| 44 # include <pwd.h> | |
| 45 # include <procfs.h> | |
| 46 | |
| 47 | |
| 48 static char* backing_store_file_name = NULL; // name of the backing store | |
| 49 // file, if successfully created. | |
| 50 | |
| 51 // Standard Memory Implementation Details | |
| 52 | |
| 53 // create the PerfData memory region in standard memory. | |
| 54 // | |
| 55 static char* create_standard_memory(size_t size) { | |
| 56 | |
| 57 // allocate an aligned chuck of memory | |
| 58 char* mapAddress = os::reserve_memory(size); | |
| 59 | |
| 60 if (mapAddress == NULL) { | |
| 61 return NULL; | |
| 62 } | |
| 63 | |
| 64 // commit memory | |
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65 if (!os::commit_memory(mapAddress, size, !ExecMem)) { |
| 0 | 66 if (PrintMiscellaneous && Verbose) { |
| 67 warning("Could not commit PerfData memory\n"); | |
| 68 } | |
| 69 os::release_memory(mapAddress, size); | |
| 70 return NULL; | |
| 71 } | |
| 72 | |
| 73 return mapAddress; | |
| 74 } | |
| 75 | |
| 76 // delete the PerfData memory region | |
| 77 // | |
| 78 static void delete_standard_memory(char* addr, size_t size) { | |
| 79 | |
| 80 // there are no persistent external resources to cleanup for standard | |
| 81 // memory. since DestroyJavaVM does not support unloading of the JVM, | |
| 82 // cleanup of the memory resource is not performed. The memory will be | |
| 83 // reclaimed by the OS upon termination of the process. | |
| 84 // | |
| 85 return; | |
| 86 } | |
| 87 | |
| 88 // save the specified memory region to the given file | |
| 89 // | |
| 90 // Note: this function might be called from signal handler (by os::abort()), | |
| 91 // don't allocate heap memory. | |
| 92 // | |
| 93 static void save_memory_to_file(char* addr, size_t size) { | |
| 94 | |
| 95 const char* destfile = PerfMemory::get_perfdata_file_path(); | |
| 96 assert(destfile[0] != '\0', "invalid PerfData file path"); | |
| 97 | |
| 98 int result; | |
| 99 | |
| 100 RESTARTABLE(::open(destfile, O_CREAT|O_WRONLY|O_TRUNC, S_IREAD|S_IWRITE), | |
| 101 result);; | |
| 102 if (result == OS_ERR) { | |
| 103 if (PrintMiscellaneous && Verbose) { | |
| 104 warning("Could not create Perfdata save file: %s: %s\n", | |
| 105 destfile, strerror(errno)); | |
| 106 } | |
| 107 } else { | |
| 108 | |
| 109 int fd = result; | |
| 110 | |
| 111 for (size_t remaining = size; remaining > 0;) { | |
| 112 | |
| 113 RESTARTABLE(::write(fd, addr, remaining), result); | |
| 114 if (result == OS_ERR) { | |
| 115 if (PrintMiscellaneous && Verbose) { | |
| 116 warning("Could not write Perfdata save file: %s: %s\n", | |
| 117 destfile, strerror(errno)); | |
| 118 } | |
| 119 break; | |
| 120 } | |
| 121 remaining -= (size_t)result; | |
| 122 addr += result; | |
| 123 } | |
| 124 | |
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125 result = ::close(fd); |
| 0 | 126 if (PrintMiscellaneous && Verbose) { |
| 127 if (result == OS_ERR) { | |
| 128 warning("Could not close %s: %s\n", destfile, strerror(errno)); | |
| 129 } | |
| 130 } | |
| 131 } | |
| 6197 | 132 FREE_C_HEAP_ARRAY(char, destfile, mtInternal); |
| 0 | 133 } |
| 134 | |
| 135 | |
| 136 // Shared Memory Implementation Details | |
| 137 | |
| 138 // Note: the solaris and linux shared memory implementation uses the mmap | |
| 139 // interface with a backing store file to implement named shared memory. | |
| 140 // Using the file system as the name space for shared memory allows a | |
| 141 // common name space to be supported across a variety of platforms. It | |
| 142 // also provides a name space that Java applications can deal with through | |
| 143 // simple file apis. | |
| 144 // | |
| 145 // The solaris and linux implementations store the backing store file in | |
| 146 // a user specific temporary directory located in the /tmp file system, | |
| 147 // which is always a local file system and is sometimes a RAM based file | |
| 148 // system. | |
| 149 | |
| 150 // return the user specific temporary directory name. | |
| 151 // | |
| 152 // the caller is expected to free the allocated memory. | |
| 153 // | |
| 154 static char* get_user_tmp_dir(const char* user) { | |
| 155 | |
| 156 const char* tmpdir = os::get_temp_directory(); | |
| 157 const char* perfdir = PERFDATA_NAME; | |
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158 size_t nbytes = strlen(tmpdir) + strlen(perfdir) + strlen(user) + 3; |
| 6197 | 159 char* dirname = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
| 0 | 160 |
| 161 // construct the path name to user specific tmp directory | |
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162 snprintf(dirname, nbytes, "%s/%s_%s", tmpdir, perfdir, user); |
| 0 | 163 |
| 164 return dirname; | |
| 165 } | |
| 166 | |
| 167 // convert the given file name into a process id. if the file | |
| 168 // does not meet the file naming constraints, return 0. | |
| 169 // | |
| 170 static pid_t filename_to_pid(const char* filename) { | |
| 171 | |
| 172 // a filename that doesn't begin with a digit is not a | |
| 173 // candidate for conversion. | |
| 174 // | |
| 175 if (!isdigit(*filename)) { | |
| 176 return 0; | |
| 177 } | |
| 178 | |
| 179 // check if file name can be converted to an integer without | |
| 180 // any leftover characters. | |
| 181 // | |
| 182 char* remainder = NULL; | |
| 183 errno = 0; | |
| 184 pid_t pid = (pid_t)strtol(filename, &remainder, 10); | |
| 185 | |
| 186 if (errno != 0) { | |
| 187 return 0; | |
| 188 } | |
| 189 | |
| 190 // check for left over characters. If any, then the filename is | |
| 191 // not a candidate for conversion. | |
| 192 // | |
| 193 if (remainder != NULL && *remainder != '\0') { | |
| 194 return 0; | |
| 195 } | |
| 196 | |
| 197 // successful conversion, return the pid | |
| 198 return pid; | |
| 199 } | |
| 200 | |
| 201 | |
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202 // Check if the given statbuf is considered a secure directory for |
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203 // the backing store files. Returns true if the directory is considered |
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204 // a secure location. Returns false if the statbuf is a symbolic link or |
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205 // if an error occurred. |
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206 // |
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207 static bool is_statbuf_secure(struct stat *statp) { |
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208 if (S_ISLNK(statp->st_mode) || !S_ISDIR(statp->st_mode)) { |
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209 // The path represents a link or some non-directory file type, |
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210 // which is not what we expected. Declare it insecure. |
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211 // |
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212 return false; |
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213 } |
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214 // We have an existing directory, check if the permissions are safe. |
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215 // |
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216 if ((statp->st_mode & (S_IWGRP|S_IWOTH)) != 0) { |
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217 // The directory is open for writing and could be subjected |
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218 // to a symlink or a hard link attack. Declare it insecure. |
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219 // |
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220 return false; |
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221 } |
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222 // See if the uid of the directory matches the effective uid of the process. |
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223 // |
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224 if (statp->st_uid != geteuid()) { |
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225 // The directory was not created by this user, declare it insecure. |
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226 // |
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227 return false; |
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228 } |
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229 return true; |
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230 } |
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231 |
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232 |
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233 // Check if the given path is considered a secure directory for |
| 0 | 234 // the backing store files. Returns true if the directory exists |
| 235 // and is considered a secure location. Returns false if the path | |
| 605 | 236 // is a symbolic link or if an error occurred. |
| 0 | 237 // |
| 238 static bool is_directory_secure(const char* path) { | |
| 239 struct stat statbuf; | |
| 240 int result = 0; | |
| 241 | |
| 242 RESTARTABLE(::lstat(path, &statbuf), result); | |
| 243 if (result == OS_ERR) { | |
| 244 return false; | |
| 245 } | |
| 246 | |
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247 // The path exists, see if it is secure. |
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248 return is_statbuf_secure(&statbuf); |
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249 } |
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250 |
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251 |
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252 // Check if the given directory file descriptor is considered a secure |
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253 // directory for the backing store files. Returns true if the directory |
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254 // exists and is considered a secure location. Returns false if the path |
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255 // is a symbolic link or if an error occurred. |
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256 // |
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257 static bool is_dirfd_secure(int dir_fd) { |
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258 struct stat statbuf; |
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259 int result = 0; |
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260 |
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261 RESTARTABLE(::fstat(dir_fd, &statbuf), result); |
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262 if (result == OS_ERR) { |
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263 return false; |
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264 } |
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265 |
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266 // The path exists, now check its mode. |
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267 return is_statbuf_secure(&statbuf); |
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268 } |
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269 |
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270 |
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271 // Check to make sure fd1 and fd2 are referencing the same file system object. |
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272 // |
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273 static bool is_same_fsobject(int fd1, int fd2) { |
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274 struct stat statbuf1; |
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275 struct stat statbuf2; |
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276 int result = 0; |
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277 |
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278 RESTARTABLE(::fstat(fd1, &statbuf1), result); |
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279 if (result == OS_ERR) { |
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280 return false; |
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281 } |
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282 RESTARTABLE(::fstat(fd2, &statbuf2), result); |
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283 if (result == OS_ERR) { |
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284 return false; |
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285 } |
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286 |
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287 if ((statbuf1.st_ino == statbuf2.st_ino) && |
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288 (statbuf1.st_dev == statbuf2.st_dev)) { |
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289 return true; |
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290 } else { |
| 0 | 291 return false; |
| 292 } | |
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293 } |
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294 |
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295 |
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296 // Open the directory of the given path and validate it. |
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297 // Return a DIR * of the open directory. |
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298 // |
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299 static DIR *open_directory_secure(const char* dirname) { |
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300 // Open the directory using open() so that it can be verified |
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301 // to be secure by calling is_dirfd_secure(), opendir() and then check |
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302 // to see if they are the same file system object. This method does not |
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303 // introduce a window of opportunity for the directory to be attacked that |
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304 // calling opendir() and is_directory_secure() does. |
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305 int result; |
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306 DIR *dirp = NULL; |
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307 RESTARTABLE(::open(dirname, O_RDONLY|O_NOFOLLOW), result); |
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308 if (result == OS_ERR) { |
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309 // Directory doesn't exist or is a symlink, so there is nothing to cleanup. |
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310 if (PrintMiscellaneous && Verbose) { |
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311 if (errno == ELOOP) { |
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312 warning("directory %s is a symlink and is not secure\n", dirname); |
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313 } else { |
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314 warning("could not open directory %s: %s\n", dirname, strerror(errno)); |
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315 } |
| 0 | 316 } |
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317 return dirp; |
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318 } |
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319 int fd = result; |
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320 |
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321 // Determine if the open directory is secure. |
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322 if (!is_dirfd_secure(fd)) { |
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323 // The directory is not a secure directory. |
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324 os::close(fd); |
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325 return dirp; |
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326 } |
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327 |
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328 // Open the directory. |
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329 dirp = ::opendir(dirname); |
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330 if (dirp == NULL) { |
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331 // The directory doesn't exist, close fd and return. |
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332 os::close(fd); |
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333 return dirp; |
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334 } |
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335 |
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336 // Check to make sure fd and dirp are referencing the same file system object. |
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337 if (!is_same_fsobject(fd, dirp->dd_fd)) { |
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338 // The directory is not secure. |
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339 os::close(fd); |
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340 os::closedir(dirp); |
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341 dirp = NULL; |
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342 return dirp; |
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343 } |
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344 |
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345 // Close initial open now that we know directory is secure |
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346 os::close(fd); |
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347 |
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348 return dirp; |
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349 } |
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350 |
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351 // NOTE: The code below uses fchdir(), open() and unlink() because |
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352 // fdopendir(), openat() and unlinkat() are not supported on all |
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353 // versions. Once the support for fdopendir(), openat() and unlinkat() |
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354 // is available on all supported versions the code can be changed |
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355 // to use these functions. |
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356 |
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357 // Open the directory of the given path, validate it and set the |
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358 // current working directory to it. |
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359 // Return a DIR * of the open directory and the saved cwd fd. |
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360 // |
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361 static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) { |
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362 |
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363 // Open the directory. |
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364 DIR* dirp = open_directory_secure(dirname); |
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365 if (dirp == NULL) { |
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366 // Directory doesn't exist or is insecure, so there is nothing to cleanup. |
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367 return dirp; |
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368 } |
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369 int fd = dirp->dd_fd; |
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370 |
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371 // Open a fd to the cwd and save it off. |
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372 int result; |
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373 RESTARTABLE(::open(".", O_RDONLY), result); |
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374 if (result == OS_ERR) { |
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375 *saved_cwd_fd = -1; |
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376 } else { |
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377 *saved_cwd_fd = result; |
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378 } |
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379 |
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380 // Set the current directory to dirname by using the fd of the directory. |
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381 result = fchdir(fd); |
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382 |
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383 return dirp; |
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384 } |
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385 |
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386 // Close the directory and restore the current working directory. |
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387 // |
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388 static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) { |
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389 |
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390 int result; |
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391 // If we have a saved cwd change back to it and close the fd. |
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392 if (saved_cwd_fd != -1) { |
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393 result = fchdir(saved_cwd_fd); |
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394 ::close(saved_cwd_fd); |
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395 } |
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396 |
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397 // Close the directory. |
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398 os::closedir(dirp); |
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399 } |
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400 |
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401 // Check if the given file descriptor is considered a secure. |
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402 // |
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403 static bool is_file_secure(int fd, const char *filename) { |
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404 |
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405 int result; |
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406 struct stat statbuf; |
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407 |
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408 // Determine if the file is secure. |
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409 RESTARTABLE(::fstat(fd, &statbuf), result); |
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410 if (result == OS_ERR) { |
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411 if (PrintMiscellaneous && Verbose) { |
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412 warning("fstat failed on %s: %s\n", filename, strerror(errno)); |
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413 } |
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414 return false; |
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415 } |
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416 if (statbuf.st_nlink > 1) { |
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417 // A file with multiple links is not expected. |
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418 if (PrintMiscellaneous && Verbose) { |
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419 warning("file %s has multiple links\n", filename); |
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420 } |
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421 return false; |
| 0 | 422 } |
| 423 return true; | |
| 424 } | |
| 425 | |
| 426 // return the user name for the given user id | |
| 427 // | |
| 428 // the caller is expected to free the allocated memory. | |
| 429 // | |
| 430 static char* get_user_name(uid_t uid) { | |
| 431 | |
| 432 struct passwd pwent; | |
| 433 | |
| 434 // determine the max pwbuf size from sysconf, and hardcode | |
| 435 // a default if this not available through sysconf. | |
| 436 // | |
| 437 long bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); | |
| 438 if (bufsize == -1) | |
| 439 bufsize = 1024; | |
| 440 | |
| 6197 | 441 char* pwbuf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
| 0 | 442 |
| 443 #ifdef _GNU_SOURCE | |
| 444 struct passwd* p = NULL; | |
| 445 int result = getpwuid_r(uid, &pwent, pwbuf, (size_t)bufsize, &p); | |
| 446 #else // _GNU_SOURCE | |
| 447 struct passwd* p = getpwuid_r(uid, &pwent, pwbuf, (int)bufsize); | |
| 448 #endif // _GNU_SOURCE | |
| 449 | |
| 450 if (p == NULL || p->pw_name == NULL || *(p->pw_name) == '\0') { | |
| 451 if (PrintMiscellaneous && Verbose) { | |
| 452 if (p == NULL) { | |
| 453 warning("Could not retrieve passwd entry: %s\n", | |
| 454 strerror(errno)); | |
| 455 } | |
| 456 else { | |
| 457 warning("Could not determine user name: %s\n", | |
| 458 p->pw_name == NULL ? "pw_name = NULL" : | |
| 459 "pw_name zero length"); | |
| 460 } | |
| 461 } | |
| 6197 | 462 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
| 0 | 463 return NULL; |
| 464 } | |
| 465 | |
| 6197 | 466 char* user_name = NEW_C_HEAP_ARRAY(char, strlen(p->pw_name) + 1, mtInternal); |
| 0 | 467 strcpy(user_name, p->pw_name); |
| 468 | |
| 6197 | 469 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
| 0 | 470 return user_name; |
| 471 } | |
| 472 | |
| 473 // return the name of the user that owns the process identified by vmid. | |
| 474 // | |
| 475 // This method uses a slow directory search algorithm to find the backing | |
| 476 // store file for the specified vmid and returns the user name, as determined | |
| 477 // by the user name suffix of the hsperfdata_<username> directory name. | |
| 478 // | |
| 479 // the caller is expected to free the allocated memory. | |
| 480 // | |
| 481 static char* get_user_name_slow(int vmid, TRAPS) { | |
| 482 | |
| 483 // short circuit the directory search if the process doesn't even exist. | |
| 484 if (kill(vmid, 0) == OS_ERR) { | |
| 485 if (errno == ESRCH) { | |
| 486 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), | |
| 487 "Process not found"); | |
| 488 } | |
| 489 else /* EPERM */ { | |
| 490 THROW_MSG_0(vmSymbols::java_io_IOException(), strerror(errno)); | |
| 491 } | |
| 492 } | |
| 493 | |
| 494 // directory search | |
| 495 char* oldest_user = NULL; | |
| 496 time_t oldest_ctime = 0; | |
| 497 | |
| 498 const char* tmpdirname = os::get_temp_directory(); | |
| 499 | |
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500 // open the temp directory |
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501 DIR* tmpdirp = open_directory_secure(tmpdirname); |
| 0 | 502 if (tmpdirp == NULL) { |
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503 // Cannot open the directory to get the user name, return. |
| 0 | 504 return NULL; |
| 505 } | |
| 506 | |
| 507 // for each entry in the directory that matches the pattern hsperfdata_*, | |
| 508 // open the directory and check if the file for the given vmid exists. | |
| 509 // The file with the expected name and the latest creation date is used | |
| 510 // to determine the user name for the process id. | |
| 511 // | |
| 512 struct dirent* dentry; | |
| 6197 | 513 char* tdbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(tmpdirname), mtInternal); |
| 0 | 514 errno = 0; |
| 515 while ((dentry = os::readdir(tmpdirp, (struct dirent *)tdbuf)) != NULL) { | |
| 516 | |
| 517 // check if the directory entry is a hsperfdata file | |
| 518 if (strncmp(dentry->d_name, PERFDATA_NAME, strlen(PERFDATA_NAME)) != 0) { | |
| 519 continue; | |
| 520 } | |
| 521 | |
| 522 char* usrdir_name = NEW_C_HEAP_ARRAY(char, | |
| 6197 | 523 strlen(tmpdirname) + strlen(dentry->d_name) + 2, mtInternal); |
| 0 | 524 strcpy(usrdir_name, tmpdirname); |
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525 strcat(usrdir_name, "/"); |
| 0 | 526 strcat(usrdir_name, dentry->d_name); |
| 527 | |
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528 // open the user directory |
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529 DIR* subdirp = open_directory_secure(usrdir_name); |
| 0 | 530 |
| 531 if (subdirp == NULL) { | |
| 6197 | 532 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
| 0 | 533 continue; |
| 534 } | |
| 535 | |
| 536 // Since we don't create the backing store files in directories | |
| 537 // pointed to by symbolic links, we also don't follow them when | |
| 538 // looking for the files. We check for a symbolic link after the | |
| 539 // call to opendir in order to eliminate a small window where the | |
| 540 // symlink can be exploited. | |
| 541 // | |
| 542 if (!is_directory_secure(usrdir_name)) { | |
| 6197 | 543 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
| 0 | 544 os::closedir(subdirp); |
| 545 continue; | |
| 546 } | |
| 547 | |
| 548 struct dirent* udentry; | |
| 6197 | 549 char* udbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(usrdir_name), mtInternal); |
| 0 | 550 errno = 0; |
| 551 while ((udentry = os::readdir(subdirp, (struct dirent *)udbuf)) != NULL) { | |
| 552 | |
| 553 if (filename_to_pid(udentry->d_name) == vmid) { | |
| 554 struct stat statbuf; | |
| 555 int result; | |
| 556 | |
| 557 char* filename = NEW_C_HEAP_ARRAY(char, | |
| 6197 | 558 strlen(usrdir_name) + strlen(udentry->d_name) + 2, mtInternal); |
| 0 | 559 |
| 560 strcpy(filename, usrdir_name); | |
| 561 strcat(filename, "/"); | |
| 562 strcat(filename, udentry->d_name); | |
| 563 | |
| 564 // don't follow symbolic links for the file | |
| 565 RESTARTABLE(::lstat(filename, &statbuf), result); | |
| 566 if (result == OS_ERR) { | |
| 6197 | 567 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 568 continue; |
| 569 } | |
| 570 | |
| 571 // skip over files that are not regular files. | |
| 572 if (!S_ISREG(statbuf.st_mode)) { | |
| 6197 | 573 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 574 continue; |
| 575 } | |
| 576 | |
| 577 // compare and save filename with latest creation time | |
| 578 if (statbuf.st_size > 0 && statbuf.st_ctime > oldest_ctime) { | |
| 579 | |
| 580 if (statbuf.st_ctime > oldest_ctime) { | |
| 581 char* user = strchr(dentry->d_name, '_') + 1; | |
| 582 | |
| 6197 | 583 if (oldest_user != NULL) FREE_C_HEAP_ARRAY(char, oldest_user, mtInternal); |
| 584 oldest_user = NEW_C_HEAP_ARRAY(char, strlen(user)+1, mtInternal); | |
| 0 | 585 |
| 586 strcpy(oldest_user, user); | |
| 587 oldest_ctime = statbuf.st_ctime; | |
| 588 } | |
| 589 } | |
| 590 | |
| 6197 | 591 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 592 } |
| 593 } | |
| 594 os::closedir(subdirp); | |
| 6197 | 595 FREE_C_HEAP_ARRAY(char, udbuf, mtInternal); |
| 596 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); | |
| 0 | 597 } |
| 598 os::closedir(tmpdirp); | |
| 6197 | 599 FREE_C_HEAP_ARRAY(char, tdbuf, mtInternal); |
| 0 | 600 |
| 601 return(oldest_user); | |
| 602 } | |
| 603 | |
| 604 // return the name of the user that owns the JVM indicated by the given vmid. | |
| 605 // | |
| 606 static char* get_user_name(int vmid, TRAPS) { | |
| 607 | |
| 608 char psinfo_name[PATH_MAX]; | |
| 609 int result; | |
| 610 | |
| 611 snprintf(psinfo_name, PATH_MAX, "/proc/%d/psinfo", vmid); | |
| 612 | |
| 613 RESTARTABLE(::open(psinfo_name, O_RDONLY), result); | |
| 614 | |
| 615 if (result != OS_ERR) { | |
| 616 int fd = result; | |
| 617 | |
| 618 psinfo_t psinfo; | |
| 619 char* addr = (char*)&psinfo; | |
| 620 | |
| 621 for (size_t remaining = sizeof(psinfo_t); remaining > 0;) { | |
| 622 | |
| 623 RESTARTABLE(::read(fd, addr, remaining), result); | |
| 624 if (result == OS_ERR) { | |
| 17707 | 625 ::close(fd); |
| 0 | 626 THROW_MSG_0(vmSymbols::java_io_IOException(), "Read error"); |
| 17707 | 627 } else { |
| 628 remaining-=result; | |
| 629 addr+=result; | |
| 0 | 630 } |
| 631 } | |
| 632 | |
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633 ::close(fd); |
| 0 | 634 |
| 635 // get the user name for the effective user id of the process | |
| 636 char* user_name = get_user_name(psinfo.pr_euid); | |
| 637 | |
| 638 return user_name; | |
| 639 } | |
| 640 | |
| 641 if (result == OS_ERR && errno == EACCES) { | |
| 642 | |
| 643 // In this case, the psinfo file for the process id existed, | |
| 644 // but we didn't have permission to access it. | |
| 645 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), | |
| 646 strerror(errno)); | |
| 647 } | |
| 648 | |
| 649 // at this point, we don't know if the process id itself doesn't | |
| 650 // exist or if the psinfo file doesn't exit. If the psinfo file | |
| 651 // doesn't exist, then we are running on Solaris 2.5.1 or earlier. | |
| 652 // since the structured procfs and old procfs interfaces can't be | |
| 653 // mixed, we attempt to find the file through a directory search. | |
| 654 | |
| 655 return get_user_name_slow(vmid, CHECK_NULL); | |
| 656 } | |
| 657 | |
| 658 // return the file name of the backing store file for the named | |
| 659 // shared memory region for the given user name and vmid. | |
| 660 // | |
| 661 // the caller is expected to free the allocated memory. | |
| 662 // | |
| 663 static char* get_sharedmem_filename(const char* dirname, int vmid) { | |
| 664 | |
| 665 // add 2 for the file separator and a NULL terminator. | |
| 666 size_t nbytes = strlen(dirname) + UINT_CHARS + 2; | |
| 667 | |
| 6197 | 668 char* name = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
| 0 | 669 snprintf(name, nbytes, "%s/%d", dirname, vmid); |
| 670 | |
| 671 return name; | |
| 672 } | |
| 673 | |
| 674 | |
| 675 // remove file | |
| 676 // | |
| 677 // this method removes the file specified by the given path | |
| 678 // | |
| 679 static void remove_file(const char* path) { | |
| 680 | |
| 681 int result; | |
| 682 | |
| 683 // if the file is a directory, the following unlink will fail. since | |
| 684 // we don't expect to find directories in the user temp directory, we | |
| 685 // won't try to handle this situation. even if accidentially or | |
| 686 // maliciously planted, the directory's presence won't hurt anything. | |
| 687 // | |
| 688 RESTARTABLE(::unlink(path), result); | |
| 689 if (PrintMiscellaneous && Verbose && result == OS_ERR) { | |
| 690 if (errno != ENOENT) { | |
| 691 warning("Could not unlink shared memory backing" | |
| 692 " store file %s : %s\n", path, strerror(errno)); | |
| 693 } | |
| 694 } | |
| 695 } | |
| 696 | |
| 697 | |
| 698 // cleanup stale shared memory resources | |
| 699 // | |
| 700 // This method attempts to remove all stale shared memory files in | |
| 701 // the named user temporary directory. It scans the named directory | |
| 702 // for files matching the pattern ^$[0-9]*$. For each file found, the | |
| 703 // process id is extracted from the file name and a test is run to | |
| 704 // determine if the process is alive. If the process is not alive, | |
| 705 // any stale file resources are removed. | |
| 706 // | |
| 707 static void cleanup_sharedmem_resources(const char* dirname) { | |
| 708 | |
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709 int saved_cwd_fd; |
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710 // open the directory |
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711 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
| 0 | 712 if (dirp == NULL) { |
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713 // directory doesn't exist or is insecure, so there is nothing to cleanup |
| 0 | 714 return; |
| 715 } | |
| 716 | |
| 717 // for each entry in the directory that matches the expected file | |
| 718 // name pattern, determine if the file resources are stale and if | |
| 719 // so, remove the file resources. Note, instrumented HotSpot processes | |
| 720 // for this user may start and/or terminate during this search and | |
| 721 // remove or create new files in this directory. The behavior of this | |
| 722 // loop under these conditions is dependent upon the implementation of | |
| 723 // opendir/readdir. | |
| 724 // | |
| 725 struct dirent* entry; | |
| 6197 | 726 char* dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(dirname), mtInternal); |
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727 |
| 0 | 728 errno = 0; |
| 729 while ((entry = os::readdir(dirp, (struct dirent *)dbuf)) != NULL) { | |
| 730 | |
| 731 pid_t pid = filename_to_pid(entry->d_name); | |
| 732 | |
| 733 if (pid == 0) { | |
| 734 | |
| 735 if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) { | |
| 736 | |
| 737 // attempt to remove all unexpected files, except "." and ".." | |
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738 unlink(entry->d_name); |
| 0 | 739 } |
| 740 | |
| 741 errno = 0; | |
| 742 continue; | |
| 743 } | |
| 744 | |
| 745 // we now have a file name that converts to a valid integer | |
| 746 // that could represent a process id . if this process id | |
| 747 // matches the current process id or the process is not running, | |
| 748 // then remove the stale file resources. | |
| 749 // | |
| 750 // process liveness is detected by sending signal number 0 to | |
| 751 // the process id (see kill(2)). if kill determines that the | |
| 752 // process does not exist, then the file resources are removed. | |
| 753 // if kill determines that that we don't have permission to | |
| 754 // signal the process, then the file resources are assumed to | |
| 755 // be stale and are removed because the resources for such a | |
| 756 // process should be in a different user specific directory. | |
| 757 // | |
| 758 if ((pid == os::current_process_id()) || | |
| 759 (kill(pid, 0) == OS_ERR && (errno == ESRCH || errno == EPERM))) { | |
| 760 | |
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761 unlink(entry->d_name); |
| 0 | 762 } |
| 763 errno = 0; | |
| 764 } | |
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765 |
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766 // close the directory and reset the current working directory |
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767 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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768 |
| 6197 | 769 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); |
| 0 | 770 } |
| 771 | |
| 772 // make the user specific temporary directory. Returns true if | |
| 773 // the directory exists and is secure upon return. Returns false | |
| 774 // if the directory exists but is either a symlink, is otherwise | |
| 775 // insecure, or if an error occurred. | |
| 776 // | |
| 777 static bool make_user_tmp_dir(const char* dirname) { | |
| 778 | |
| 779 // create the directory with 0755 permissions. note that the directory | |
| 780 // will be owned by euid::egid, which may not be the same as uid::gid. | |
| 781 // | |
| 782 if (mkdir(dirname, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) == OS_ERR) { | |
| 783 if (errno == EEXIST) { | |
| 784 // The directory already exists and was probably created by another | |
| 785 // JVM instance. However, this could also be the result of a | |
| 786 // deliberate symlink. Verify that the existing directory is safe. | |
| 787 // | |
| 788 if (!is_directory_secure(dirname)) { | |
| 789 // directory is not secure | |
| 790 if (PrintMiscellaneous && Verbose) { | |
| 791 warning("%s directory is insecure\n", dirname); | |
| 792 } | |
| 793 return false; | |
| 794 } | |
| 795 } | |
| 796 else { | |
| 797 // we encountered some other failure while attempting | |
| 798 // to create the directory | |
| 799 // | |
| 800 if (PrintMiscellaneous && Verbose) { | |
| 801 warning("could not create directory %s: %s\n", | |
| 802 dirname, strerror(errno)); | |
| 803 } | |
| 804 return false; | |
| 805 } | |
| 806 } | |
| 807 return true; | |
| 808 } | |
| 809 | |
| 810 // create the shared memory file resources | |
| 811 // | |
| 812 // This method creates the shared memory file with the given size | |
| 813 // This method also creates the user specific temporary directory, if | |
| 814 // it does not yet exist. | |
| 815 // | |
| 816 static int create_sharedmem_resources(const char* dirname, const char* filename, size_t size) { | |
| 817 | |
| 818 // make the user temporary directory | |
| 819 if (!make_user_tmp_dir(dirname)) { | |
| 820 // could not make/find the directory or the found directory | |
| 821 // was not secure | |
| 822 return -1; | |
| 823 } | |
| 824 | |
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825 int saved_cwd_fd; |
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826 // open the directory and set the current working directory to it |
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827 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
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828 if (dirp == NULL) { |
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829 // Directory doesn't exist or is insecure, so cannot create shared |
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830 // memory file. |
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831 return -1; |
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832 } |
| 0 | 833 |
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834 // Open the filename in the current directory. |
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835 // Cannot use O_TRUNC here; truncation of an existing file has to happen |
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836 // after the is_file_secure() check below. |
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837 int result; |
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838 RESTARTABLE(::open(filename, O_RDWR|O_CREAT|O_NOFOLLOW, S_IREAD|S_IWRITE), result); |
| 0 | 839 if (result == OS_ERR) { |
| 840 if (PrintMiscellaneous && Verbose) { | |
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841 if (errno == ELOOP) { |
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842 warning("file %s is a symlink and is not secure\n", filename); |
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843 } else { |
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844 warning("could not create file %s: %s\n", filename, strerror(errno)); |
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845 } |
| 0 | 846 } |
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847 // close the directory and reset the current working directory |
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848 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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849 |
| 0 | 850 return -1; |
| 851 } | |
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852 // close the directory and reset the current working directory |
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853 close_directory_secure_cwd(dirp, saved_cwd_fd); |
| 0 | 854 |
| 855 // save the file descriptor | |
| 856 int fd = result; | |
| 857 | |
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858 // check to see if the file is secure |
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859 if (!is_file_secure(fd, filename)) { |
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860 ::close(fd); |
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861 return -1; |
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862 } |
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863 |
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864 // truncate the file to get rid of any existing data |
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865 RESTARTABLE(::ftruncate(fd, (off_t)0), result); |
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866 if (result == OS_ERR) { |
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867 if (PrintMiscellaneous && Verbose) { |
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868 warning("could not truncate shared memory file: %s\n", strerror(errno)); |
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869 } |
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870 ::close(fd); |
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871 return -1; |
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872 } |
| 0 | 873 // set the file size |
| 874 RESTARTABLE(::ftruncate(fd, (off_t)size), result); | |
| 875 if (result == OS_ERR) { | |
| 876 if (PrintMiscellaneous && Verbose) { | |
| 877 warning("could not set shared memory file size: %s\n", strerror(errno)); | |
| 878 } | |
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879 ::close(fd); |
| 0 | 880 return -1; |
| 881 } | |
| 882 | |
| 883 return fd; | |
| 884 } | |
| 885 | |
| 886 // open the shared memory file for the given user and vmid. returns | |
| 887 // the file descriptor for the open file or -1 if the file could not | |
| 888 // be opened. | |
| 889 // | |
| 890 static int open_sharedmem_file(const char* filename, int oflags, TRAPS) { | |
| 891 | |
| 892 // open the file | |
| 893 int result; | |
| 894 RESTARTABLE(::open(filename, oflags), result); | |
| 895 if (result == OS_ERR) { | |
| 896 if (errno == ENOENT) { | |
|
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897 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
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898 "Process not found", OS_ERR); |
| 0 | 899 } |
| 900 else if (errno == EACCES) { | |
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901 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
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902 "Permission denied", OS_ERR); |
| 0 | 903 } |
| 904 else { | |
|
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905 THROW_MSG_(vmSymbols::java_io_IOException(), strerror(errno), OS_ERR); |
| 0 | 906 } |
| 907 } | |
|
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908 int fd = result; |
| 0 | 909 |
|
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910 // check to see if the file is secure |
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911 if (!is_file_secure(fd, filename)) { |
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912 ::close(fd); |
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913 return -1; |
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914 } |
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915 |
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916 return fd; |
| 0 | 917 } |
| 918 | |
| 919 // create a named shared memory region. returns the address of the | |
| 920 // memory region on success or NULL on failure. A return value of | |
| 921 // NULL will ultimately disable the shared memory feature. | |
| 922 // | |
| 923 // On Solaris and Linux, the name space for shared memory objects | |
| 924 // is the file system name space. | |
| 925 // | |
| 926 // A monitoring application attaching to a JVM does not need to know | |
| 927 // the file system name of the shared memory object. However, it may | |
| 928 // be convenient for applications to discover the existence of newly | |
| 929 // created and terminating JVMs by watching the file system name space | |
| 930 // for files being created or removed. | |
| 931 // | |
| 932 static char* mmap_create_shared(size_t size) { | |
| 933 | |
| 934 int result; | |
| 935 int fd; | |
| 936 char* mapAddress; | |
| 937 | |
| 938 int vmid = os::current_process_id(); | |
| 939 | |
| 940 char* user_name = get_user_name(geteuid()); | |
| 941 | |
| 942 if (user_name == NULL) | |
| 943 return NULL; | |
| 944 | |
| 945 char* dirname = get_user_tmp_dir(user_name); | |
| 946 char* filename = get_sharedmem_filename(dirname, vmid); | |
| 947 | |
|
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948 // get the short filename |
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949 char* short_filename = strrchr(filename, '/'); |
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950 if (short_filename == NULL) { |
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951 short_filename = filename; |
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952 } else { |
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953 short_filename++; |
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954 } |
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955 |
| 0 | 956 // cleanup any stale shared memory files |
| 957 cleanup_sharedmem_resources(dirname); | |
| 958 | |
| 959 assert(((size > 0) && (size % os::vm_page_size() == 0)), | |
| 960 "unexpected PerfMemory region size"); | |
| 961 | |
|
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962 fd = create_sharedmem_resources(dirname, short_filename, size); |
| 0 | 963 |
| 6197 | 964 FREE_C_HEAP_ARRAY(char, user_name, mtInternal); |
| 965 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
| 0 | 966 |
| 967 if (fd == -1) { | |
| 6197 | 968 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 969 return NULL; |
| 970 } | |
| 971 | |
| 972 mapAddress = (char*)::mmap((char*)0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
| 973 | |
|
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974 result = ::close(fd); |
| 0 | 975 assert(result != OS_ERR, "could not close file"); |
| 976 | |
| 977 if (mapAddress == MAP_FAILED) { | |
| 978 if (PrintMiscellaneous && Verbose) { | |
| 979 warning("mmap failed - %s\n", strerror(errno)); | |
| 980 } | |
| 981 remove_file(filename); | |
| 6197 | 982 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 0 | 983 return NULL; |
| 984 } | |
| 985 | |
| 986 // save the file name for use in delete_shared_memory() | |
| 987 backing_store_file_name = filename; | |
| 988 | |
| 989 // clear the shared memory region | |
| 990 (void)::memset((void*) mapAddress, 0, size); | |
| 991 | |
|
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992 // it does not go through os api, the operation has to record from here |
| 20360 | 993 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, |
| 994 size, CURRENT_PC, mtInternal); | |
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995 |
| 0 | 996 return mapAddress; |
| 997 } | |
| 998 | |
| 999 // release a named shared memory region | |
| 1000 // | |
| 1001 static void unmap_shared(char* addr, size_t bytes) { | |
| 1002 os::release_memory(addr, bytes); | |
| 1003 } | |
| 1004 | |
| 1005 // create the PerfData memory region in shared memory. | |
| 1006 // | |
| 1007 static char* create_shared_memory(size_t size) { | |
| 1008 | |
| 1009 // create the shared memory region. | |
| 1010 return mmap_create_shared(size); | |
| 1011 } | |
| 1012 | |
| 1013 // delete the shared PerfData memory region | |
| 1014 // | |
| 1015 static void delete_shared_memory(char* addr, size_t size) { | |
| 1016 | |
| 1017 // cleanup the persistent shared memory resources. since DestroyJavaVM does | |
| 1018 // not support unloading of the JVM, unmapping of the memory resource is | |
| 1019 // not performed. The memory will be reclaimed by the OS upon termination of | |
| 1020 // the process. The backing store file is deleted from the file system. | |
| 1021 | |
| 1022 assert(!PerfDisableSharedMem, "shouldn't be here"); | |
| 1023 | |
| 1024 if (backing_store_file_name != NULL) { | |
| 1025 remove_file(backing_store_file_name); | |
| 1026 // Don't.. Free heap memory could deadlock os::abort() if it is called | |
| 1027 // from signal handler. OS will reclaim the heap memory. | |
| 1028 // FREE_C_HEAP_ARRAY(char, backing_store_file_name); | |
| 1029 backing_store_file_name = NULL; | |
| 1030 } | |
| 1031 } | |
| 1032 | |
| 1033 // return the size of the file for the given file descriptor | |
| 1034 // or 0 if it is not a valid size for a shared memory file | |
| 1035 // | |
| 1036 static size_t sharedmem_filesize(int fd, TRAPS) { | |
| 1037 | |
| 1038 struct stat statbuf; | |
| 1039 int result; | |
| 1040 | |
| 1041 RESTARTABLE(::fstat(fd, &statbuf), result); | |
| 1042 if (result == OS_ERR) { | |
| 1043 if (PrintMiscellaneous && Verbose) { | |
| 1044 warning("fstat failed: %s\n", strerror(errno)); | |
| 1045 } | |
| 1046 THROW_MSG_0(vmSymbols::java_io_IOException(), | |
| 1047 "Could not determine PerfMemory size"); | |
| 1048 } | |
| 1049 | |
| 1050 if ((statbuf.st_size == 0) || | |
| 1051 ((size_t)statbuf.st_size % os::vm_page_size() != 0)) { | |
| 1052 THROW_MSG_0(vmSymbols::java_lang_Exception(), | |
| 1053 "Invalid PerfMemory size"); | |
| 1054 } | |
| 1055 | |
| 1056 return (size_t)statbuf.st_size; | |
| 1057 } | |
| 1058 | |
| 1059 // attach to a named shared memory region. | |
| 1060 // | |
| 1061 static void mmap_attach_shared(const char* user, int vmid, PerfMemory::PerfMemoryMode mode, char** addr, size_t* sizep, TRAPS) { | |
| 1062 | |
| 1063 char* mapAddress; | |
| 1064 int result; | |
| 1065 int fd; | |
|
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1066 size_t size = 0; |
| 0 | 1067 const char* luser = NULL; |
| 1068 | |
| 1069 int mmap_prot; | |
| 1070 int file_flags; | |
| 1071 | |
| 1072 ResourceMark rm; | |
| 1073 | |
| 1074 // map the high level access mode to the appropriate permission | |
| 1075 // constructs for the file and the shared memory mapping. | |
| 1076 if (mode == PerfMemory::PERF_MODE_RO) { | |
| 1077 mmap_prot = PROT_READ; | |
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1078 file_flags = O_RDONLY | O_NOFOLLOW; |
| 0 | 1079 } |
| 1080 else if (mode == PerfMemory::PERF_MODE_RW) { | |
| 1081 #ifdef LATER | |
| 1082 mmap_prot = PROT_READ | PROT_WRITE; | |
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1083 file_flags = O_RDWR | O_NOFOLLOW; |
| 0 | 1084 #else |
| 1085 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
| 1086 "Unsupported access mode"); | |
| 1087 #endif | |
| 1088 } | |
| 1089 else { | |
| 1090 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
| 1091 "Illegal access mode"); | |
| 1092 } | |
| 1093 | |
| 1094 if (user == NULL || strlen(user) == 0) { | |
| 1095 luser = get_user_name(vmid, CHECK); | |
| 1096 } | |
| 1097 else { | |
| 1098 luser = user; | |
| 1099 } | |
| 1100 | |
| 1101 if (luser == NULL) { | |
| 1102 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
| 1103 "Could not map vmid to user Name"); | |
| 1104 } | |
| 1105 | |
| 1106 char* dirname = get_user_tmp_dir(luser); | |
| 1107 | |
| 1108 // since we don't follow symbolic links when creating the backing | |
| 1109 // store file, we don't follow them when attaching either. | |
| 1110 // | |
| 1111 if (!is_directory_secure(dirname)) { | |
| 6197 | 1112 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); |
| 0 | 1113 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
| 1114 "Process not found"); | |
| 1115 } | |
| 1116 | |
| 1117 char* filename = get_sharedmem_filename(dirname, vmid); | |
| 1118 | |
| 1119 // copy heap memory to resource memory. the open_sharedmem_file | |
| 1120 // method below need to use the filename, but could throw an | |
| 1121 // exception. using a resource array prevents the leak that | |
| 1122 // would otherwise occur. | |
| 1123 char* rfilename = NEW_RESOURCE_ARRAY(char, strlen(filename) + 1); | |
| 1124 strcpy(rfilename, filename); | |
| 1125 | |
| 1126 // free the c heap resources that are no longer needed | |
| 6197 | 1127 if (luser != user) FREE_C_HEAP_ARRAY(char, luser, mtInternal); |
| 1128 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
| 1129 FREE_C_HEAP_ARRAY(char, filename, mtInternal); | |
| 0 | 1130 |
| 1131 // open the shared memory file for the give vmid | |
| 17707 | 1132 fd = open_sharedmem_file(rfilename, file_flags, THREAD); |
| 1133 | |
| 1134 if (fd == OS_ERR) { | |
| 1135 return; | |
| 1136 } | |
| 1137 | |
| 1138 if (HAS_PENDING_EXCEPTION) { | |
| 1139 ::close(fd); | |
| 1140 return; | |
| 1141 } | |
| 0 | 1142 |
| 1143 if (*sizep == 0) { | |
| 1144 size = sharedmem_filesize(fd, CHECK); | |
|
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1145 } else { |
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1146 size = *sizep; |
| 0 | 1147 } |
| 1148 | |
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1149 assert(size > 0, "unexpected size <= 0"); |
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1150 |
| 0 | 1151 mapAddress = (char*)::mmap((char*)0, size, mmap_prot, MAP_SHARED, fd, 0); |
| 1152 | |
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1153 result = ::close(fd); |
| 0 | 1154 assert(result != OS_ERR, "could not close file"); |
| 1155 | |
| 1156 if (mapAddress == MAP_FAILED) { | |
| 1157 if (PrintMiscellaneous && Verbose) { | |
| 1158 warning("mmap failed: %s\n", strerror(errno)); | |
| 1159 } | |
| 1160 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), | |
| 1161 "Could not map PerfMemory"); | |
| 1162 } | |
| 1163 | |
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1164 // it does not go through os api, the operation has to record from here |
| 20360 | 1165 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, |
| 1166 size, CURRENT_PC, mtInternal); | |
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1167 |
| 0 | 1168 *addr = mapAddress; |
| 1169 *sizep = size; | |
| 1170 | |
| 1171 if (PerfTraceMemOps) { | |
| 1172 tty->print("mapped " SIZE_FORMAT " bytes for vmid %d at " | |
| 1173 INTPTR_FORMAT "\n", size, vmid, (void*)mapAddress); | |
| 1174 } | |
| 1175 } | |
| 1176 | |
| 1177 | |
| 1178 | |
| 1179 | |
| 1180 // create the PerfData memory region | |
| 1181 // | |
| 1182 // This method creates the memory region used to store performance | |
| 1183 // data for the JVM. The memory may be created in standard or | |
| 1184 // shared memory. | |
| 1185 // | |
| 1186 void PerfMemory::create_memory_region(size_t size) { | |
| 1187 | |
| 1188 if (PerfDisableSharedMem) { | |
| 1189 // do not share the memory for the performance data. | |
| 1190 _start = create_standard_memory(size); | |
| 1191 } | |
| 1192 else { | |
| 1193 _start = create_shared_memory(size); | |
| 1194 if (_start == NULL) { | |
| 1195 | |
| 1196 // creation of the shared memory region failed, attempt | |
| 1197 // to create a contiguous, non-shared memory region instead. | |
| 1198 // | |
| 1199 if (PrintMiscellaneous && Verbose) { | |
| 1200 warning("Reverting to non-shared PerfMemory region.\n"); | |
| 1201 } | |
| 1202 PerfDisableSharedMem = true; | |
| 1203 _start = create_standard_memory(size); | |
| 1204 } | |
| 1205 } | |
| 1206 | |
| 1207 if (_start != NULL) _capacity = size; | |
| 1208 | |
| 1209 } | |
| 1210 | |
| 1211 // delete the PerfData memory region | |
| 1212 // | |
| 1213 // This method deletes the memory region used to store performance | |
| 1214 // data for the JVM. The memory region indicated by the <address, size> | |
| 1215 // tuple will be inaccessible after a call to this method. | |
| 1216 // | |
| 1217 void PerfMemory::delete_memory_region() { | |
| 1218 | |
| 1219 assert((start() != NULL && capacity() > 0), "verify proper state"); | |
| 1220 | |
| 1221 // If user specifies PerfDataSaveFile, it will save the performance data | |
| 1222 // to the specified file name no matter whether PerfDataSaveToFile is specified | |
| 1223 // or not. In other word, -XX:PerfDataSaveFile=.. overrides flag | |
| 1224 // -XX:+PerfDataSaveToFile. | |
| 1225 if (PerfDataSaveToFile || PerfDataSaveFile != NULL) { | |
| 1226 save_memory_to_file(start(), capacity()); | |
| 1227 } | |
| 1228 | |
| 1229 if (PerfDisableSharedMem) { | |
| 1230 delete_standard_memory(start(), capacity()); | |
| 1231 } | |
| 1232 else { | |
| 1233 delete_shared_memory(start(), capacity()); | |
| 1234 } | |
| 1235 } | |
| 1236 | |
| 1237 // attach to the PerfData memory region for another JVM | |
| 1238 // | |
| 1239 // This method returns an <address, size> tuple that points to | |
| 1240 // a memory buffer that is kept reasonably synchronized with | |
| 1241 // the PerfData memory region for the indicated JVM. This | |
| 1242 // buffer may be kept in synchronization via shared memory | |
| 1243 // or some other mechanism that keeps the buffer updated. | |
| 1244 // | |
| 1245 // If the JVM chooses not to support the attachability feature, | |
| 1246 // this method should throw an UnsupportedOperation exception. | |
| 1247 // | |
| 1248 // This implementation utilizes named shared memory to map | |
| 1249 // the indicated process's PerfData memory region into this JVMs | |
| 1250 // address space. | |
| 1251 // | |
| 1252 void PerfMemory::attach(const char* user, int vmid, PerfMemoryMode mode, char** addrp, size_t* sizep, TRAPS) { | |
| 1253 | |
| 1254 if (vmid == 0 || vmid == os::current_process_id()) { | |
| 1255 *addrp = start(); | |
| 1256 *sizep = capacity(); | |
| 1257 return; | |
| 1258 } | |
| 1259 | |
| 1260 mmap_attach_shared(user, vmid, mode, addrp, sizep, CHECK); | |
| 1261 } | |
| 1262 | |
| 1263 // detach from the PerfData memory region of another JVM | |
| 1264 // | |
| 1265 // This method detaches the PerfData memory region of another | |
| 1266 // JVM, specified as an <address, size> tuple of a buffer | |
| 1267 // in this process's address space. This method may perform | |
| 1268 // arbitrary actions to accomplish the detachment. The memory | |
| 1269 // region specified by <address, size> will be inaccessible after | |
| 1270 // a call to this method. | |
| 1271 // | |
| 1272 // If the JVM chooses not to support the attachability feature, | |
| 1273 // this method should throw an UnsupportedOperation exception. | |
| 1274 // | |
| 1275 // This implementation utilizes named shared memory to detach | |
| 1276 // the indicated process's PerfData memory region from this | |
| 1277 // process's address space. | |
| 1278 // | |
| 1279 void PerfMemory::detach(char* addr, size_t bytes, TRAPS) { | |
| 1280 | |
| 1281 assert(addr != 0, "address sanity check"); | |
| 1282 assert(bytes > 0, "capacity sanity check"); | |
| 1283 | |
| 1284 if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) { | |
| 1285 // prevent accidental detachment of this process's PerfMemory region | |
| 1286 return; | |
| 1287 } | |
| 1288 | |
| 1289 unmap_shared(addr, bytes); | |
| 1290 } | |
| 1291 | |
| 1292 char* PerfMemory::backing_store_filename() { | |
| 1293 return backing_store_file_name; | |
| 1294 } |