Mercurial > hg > truffle
annotate src/os/bsd/vm/perfMemory_bsd.cpp @ 21821:9a227eaac2dc
8050807: Better performing performance data handling
Reviewed-by: dcubed, pnauman, ctornqvi, dholmes, mschoene
Contributed-by: gerald.thornbrugh@oracle.com
| author | gthornbr |
|---|---|
| date | Mon, 17 Nov 2014 15:51:46 -0500 |
| parents | fb677d6aebea |
| children | f3ffb37f88a6 |
| rev | line source |
|---|---|
| 3960 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 3960 | 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 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 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_bsd.inline.hpp" | |
| 31 #include "runtime/handles.inline.hpp" | |
| 32 #include "runtime/perfMemory.hpp" | |
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33 #include "services/memTracker.hpp" |
| 3960 | 34 #include "utilities/exceptions.hpp" |
| 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 | |
| 46 static char* backing_store_file_name = NULL; // name of the backing store | |
| 47 // file, if successfully created. | |
| 48 | |
| 49 // Standard Memory Implementation Details | |
| 50 | |
| 51 // create the PerfData memory region in standard memory. | |
| 52 // | |
| 53 static char* create_standard_memory(size_t size) { | |
| 54 | |
| 55 // allocate an aligned chuck of memory | |
| 56 char* mapAddress = os::reserve_memory(size); | |
| 57 | |
| 58 if (mapAddress == NULL) { | |
| 59 return NULL; | |
| 60 } | |
| 61 | |
| 62 // commit memory | |
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63 if (!os::commit_memory(mapAddress, size, !ExecMem)) { |
| 3960 | 64 if (PrintMiscellaneous && Verbose) { |
| 65 warning("Could not commit PerfData memory\n"); | |
| 66 } | |
| 67 os::release_memory(mapAddress, size); | |
| 68 return NULL; | |
| 69 } | |
| 70 | |
| 71 return mapAddress; | |
| 72 } | |
| 73 | |
| 74 // delete the PerfData memory region | |
| 75 // | |
| 76 static void delete_standard_memory(char* addr, size_t size) { | |
| 77 | |
| 78 // there are no persistent external resources to cleanup for standard | |
| 79 // memory. since DestroyJavaVM does not support unloading of the JVM, | |
| 80 // cleanup of the memory resource is not performed. The memory will be | |
| 81 // reclaimed by the OS upon termination of the process. | |
| 82 // | |
| 83 return; | |
| 84 } | |
| 85 | |
| 86 // save the specified memory region to the given file | |
| 87 // | |
| 88 // Note: this function might be called from signal handler (by os::abort()), | |
| 89 // don't allocate heap memory. | |
| 90 // | |
| 91 static void save_memory_to_file(char* addr, size_t size) { | |
| 92 | |
| 93 const char* destfile = PerfMemory::get_perfdata_file_path(); | |
| 94 assert(destfile[0] != '\0', "invalid PerfData file path"); | |
| 95 | |
| 96 int result; | |
| 97 | |
| 98 RESTARTABLE(::open(destfile, O_CREAT|O_WRONLY|O_TRUNC, S_IREAD|S_IWRITE), | |
| 99 result);; | |
| 100 if (result == OS_ERR) { | |
| 101 if (PrintMiscellaneous && Verbose) { | |
| 102 warning("Could not create Perfdata save file: %s: %s\n", | |
| 103 destfile, strerror(errno)); | |
| 104 } | |
| 105 } else { | |
| 106 int fd = result; | |
| 107 | |
| 108 for (size_t remaining = size; remaining > 0;) { | |
| 109 | |
| 110 RESTARTABLE(::write(fd, addr, remaining), result); | |
| 111 if (result == OS_ERR) { | |
| 112 if (PrintMiscellaneous && Verbose) { | |
| 113 warning("Could not write Perfdata save file: %s: %s\n", | |
| 114 destfile, strerror(errno)); | |
| 115 } | |
| 116 break; | |
| 117 } | |
| 118 | |
| 119 remaining -= (size_t)result; | |
| 120 addr += result; | |
| 121 } | |
| 122 | |
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123 result = ::close(fd); |
| 3960 | 124 if (PrintMiscellaneous && Verbose) { |
| 125 if (result == OS_ERR) { | |
| 126 warning("Could not close %s: %s\n", destfile, strerror(errno)); | |
| 127 } | |
| 128 } | |
| 129 } | |
| 6197 | 130 FREE_C_HEAP_ARRAY(char, destfile, mtInternal); |
| 3960 | 131 } |
| 132 | |
| 133 | |
| 134 // Shared Memory Implementation Details | |
| 135 | |
| 136 // Note: the solaris and bsd shared memory implementation uses the mmap | |
| 137 // interface with a backing store file to implement named shared memory. | |
| 138 // Using the file system as the name space for shared memory allows a | |
| 139 // common name space to be supported across a variety of platforms. It | |
| 140 // also provides a name space that Java applications can deal with through | |
| 141 // simple file apis. | |
| 142 // | |
| 143 // The solaris and bsd implementations store the backing store file in | |
| 144 // a user specific temporary directory located in the /tmp file system, | |
| 145 // which is always a local file system and is sometimes a RAM based file | |
| 146 // system. | |
| 147 | |
| 148 // return the user specific temporary directory name. | |
| 149 // | |
| 150 // the caller is expected to free the allocated memory. | |
| 151 // | |
| 152 static char* get_user_tmp_dir(const char* user) { | |
| 153 | |
| 154 const char* tmpdir = os::get_temp_directory(); | |
| 155 const char* perfdir = PERFDATA_NAME; | |
| 156 size_t nbytes = strlen(tmpdir) + strlen(perfdir) + strlen(user) + 3; | |
| 6197 | 157 char* dirname = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
| 3960 | 158 |
| 159 // construct the path name to user specific tmp directory | |
| 160 snprintf(dirname, nbytes, "%s/%s_%s", tmpdir, perfdir, user); | |
| 161 | |
| 162 return dirname; | |
| 163 } | |
| 164 | |
| 165 // convert the given file name into a process id. if the file | |
| 166 // does not meet the file naming constraints, return 0. | |
| 167 // | |
| 168 static pid_t filename_to_pid(const char* filename) { | |
| 169 | |
| 170 // a filename that doesn't begin with a digit is not a | |
| 171 // candidate for conversion. | |
| 172 // | |
| 173 if (!isdigit(*filename)) { | |
| 174 return 0; | |
| 175 } | |
| 176 | |
| 177 // check if file name can be converted to an integer without | |
| 178 // any leftover characters. | |
| 179 // | |
| 180 char* remainder = NULL; | |
| 181 errno = 0; | |
| 182 pid_t pid = (pid_t)strtol(filename, &remainder, 10); | |
| 183 | |
| 184 if (errno != 0) { | |
| 185 return 0; | |
| 186 } | |
| 187 | |
| 188 // check for left over characters. If any, then the filename is | |
| 189 // not a candidate for conversion. | |
| 190 // | |
| 191 if (remainder != NULL && *remainder != '\0') { | |
| 192 return 0; | |
| 193 } | |
| 194 | |
| 195 // successful conversion, return the pid | |
| 196 return pid; | |
| 197 } | |
| 198 | |
| 199 | |
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200 // Check if the given statbuf is considered a secure directory for |
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201 // the backing store files. Returns true if the directory is considered |
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202 // a secure location. Returns false if the statbuf is a symbolic link or |
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203 // if an error occurred. |
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204 // |
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205 static bool is_statbuf_secure(struct stat *statp) { |
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206 if (S_ISLNK(statp->st_mode) || !S_ISDIR(statp->st_mode)) { |
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207 // The path represents a link or some non-directory file type, |
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208 // which is not what we expected. Declare it insecure. |
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209 // |
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210 return false; |
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211 } |
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212 // We have an existing directory, check if the permissions are safe. |
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213 // |
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214 if ((statp->st_mode & (S_IWGRP|S_IWOTH)) != 0) { |
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215 // The directory is open for writing and could be subjected |
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216 // to a symlink or a hard link attack. Declare it insecure. |
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217 // |
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218 return false; |
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219 } |
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220 // See if the uid of the directory matches the effective uid of the process. |
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221 // |
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222 if (statp->st_uid != geteuid()) { |
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223 // The directory was not created by this user, declare it insecure. |
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224 // |
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225 return false; |
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226 } |
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227 return true; |
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228 } |
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229 |
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230 |
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231 // Check if the given path is considered a secure directory for |
| 3960 | 232 // the backing store files. Returns true if the directory exists |
| 233 // and is considered a secure location. Returns false if the path | |
| 234 // is a symbolic link or if an error occurred. | |
| 235 // | |
| 236 static bool is_directory_secure(const char* path) { | |
| 237 struct stat statbuf; | |
| 238 int result = 0; | |
| 239 | |
| 240 RESTARTABLE(::lstat(path, &statbuf), result); | |
| 241 if (result == OS_ERR) { | |
| 242 return false; | |
| 243 } | |
| 244 | |
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245 // The path exists, see if it is secure. |
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246 return is_statbuf_secure(&statbuf); |
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247 } |
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248 |
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249 |
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250 // Check if the given directory file descriptor is considered a secure |
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251 // directory for the backing store files. Returns true if the directory |
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252 // exists and is considered a secure location. Returns false if the path |
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253 // is a symbolic link or if an error occurred. |
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254 // |
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255 static bool is_dirfd_secure(int dir_fd) { |
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256 struct stat statbuf; |
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257 int result = 0; |
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258 |
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259 RESTARTABLE(::fstat(dir_fd, &statbuf), result); |
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260 if (result == OS_ERR) { |
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261 return false; |
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262 } |
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263 |
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264 // The path exists, now check its mode. |
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265 return is_statbuf_secure(&statbuf); |
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266 } |
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267 |
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268 |
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269 // Check to make sure fd1 and fd2 are referencing the same file system object. |
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270 // |
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271 static bool is_same_fsobject(int fd1, int fd2) { |
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272 struct stat statbuf1; |
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273 struct stat statbuf2; |
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274 int result = 0; |
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275 |
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276 RESTARTABLE(::fstat(fd1, &statbuf1), result); |
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277 if (result == OS_ERR) { |
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278 return false; |
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279 } |
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280 RESTARTABLE(::fstat(fd2, &statbuf2), result); |
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281 if (result == OS_ERR) { |
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282 return false; |
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283 } |
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284 |
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285 if ((statbuf1.st_ino == statbuf2.st_ino) && |
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286 (statbuf1.st_dev == statbuf2.st_dev)) { |
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287 return true; |
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288 } else { |
| 3960 | 289 return false; |
| 290 } | |
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291 } |
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292 |
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293 |
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294 // Open the directory of the given path and validate it. |
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295 // Return a DIR * of the open directory. |
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296 // |
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297 static DIR *open_directory_secure(const char* dirname) { |
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298 // Open the directory using open() so that it can be verified |
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299 // to be secure by calling is_dirfd_secure(), opendir() and then check |
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300 // to see if they are the same file system object. This method does not |
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301 // introduce a window of opportunity for the directory to be attacked that |
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302 // calling opendir() and is_directory_secure() does. |
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303 int result; |
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304 DIR *dirp = NULL; |
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305 RESTARTABLE(::open(dirname, O_RDONLY|O_NOFOLLOW), result); |
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306 if (result == OS_ERR) { |
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307 // Directory doesn't exist or is a symlink, so there is nothing to cleanup. |
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308 if (PrintMiscellaneous && Verbose) { |
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309 if (errno == ELOOP) { |
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310 warning("directory %s is a symlink and is not secure\n", dirname); |
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311 } else { |
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312 warning("could not open directory %s: %s\n", dirname, strerror(errno)); |
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313 } |
| 3960 | 314 } |
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315 return dirp; |
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316 } |
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317 int fd = result; |
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318 |
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319 // Determine if the open directory is secure. |
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320 if (!is_dirfd_secure(fd)) { |
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321 // The directory is not a secure directory. |
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322 os::close(fd); |
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323 return dirp; |
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324 } |
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325 |
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326 // Open the directory. |
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327 dirp = ::opendir(dirname); |
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328 if (dirp == NULL) { |
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329 // The directory doesn't exist, close fd and return. |
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330 os::close(fd); |
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331 return dirp; |
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332 } |
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333 |
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334 // Check to make sure fd and dirp are referencing the same file system object. |
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335 if (!is_same_fsobject(fd, dirfd(dirp))) { |
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336 // The directory is not secure. |
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337 os::close(fd); |
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338 os::closedir(dirp); |
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339 dirp = NULL; |
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340 return dirp; |
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341 } |
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342 |
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343 // Close initial open now that we know directory is secure |
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344 os::close(fd); |
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345 |
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346 return dirp; |
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347 } |
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348 |
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349 // NOTE: The code below uses fchdir(), open() and unlink() because |
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350 // fdopendir(), openat() and unlinkat() are not supported on all |
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351 // versions. Once the support for fdopendir(), openat() and unlinkat() |
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352 // is available on all supported versions the code can be changed |
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353 // to use these functions. |
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354 |
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355 // Open the directory of the given path, validate it and set the |
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356 // current working directory to it. |
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357 // Return a DIR * of the open directory and the saved cwd fd. |
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358 // |
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359 static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) { |
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360 |
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361 // Open the directory. |
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362 DIR* dirp = open_directory_secure(dirname); |
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363 if (dirp == NULL) { |
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364 // Directory doesn't exist or is insecure, so there is nothing to cleanup. |
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365 return dirp; |
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366 } |
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367 int fd = dirfd(dirp); |
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368 |
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369 // Open a fd to the cwd and save it off. |
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370 int result; |
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371 RESTARTABLE(::open(".", O_RDONLY), result); |
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372 if (result == OS_ERR) { |
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373 *saved_cwd_fd = -1; |
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374 } else { |
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375 *saved_cwd_fd = result; |
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376 } |
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377 |
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378 // Set the current directory to dirname by using the fd of the directory. |
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379 result = fchdir(fd); |
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380 |
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381 return dirp; |
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382 } |
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383 |
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384 // Close the directory and restore the current working directory. |
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385 // |
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386 static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) { |
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387 |
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388 int result; |
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389 // If we have a saved cwd change back to it and close the fd. |
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390 if (saved_cwd_fd != -1) { |
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391 result = fchdir(saved_cwd_fd); |
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392 ::close(saved_cwd_fd); |
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393 } |
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394 |
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395 // Close the directory. |
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396 os::closedir(dirp); |
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397 } |
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398 |
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399 // Check if the given file descriptor is considered a secure. |
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400 // |
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401 static bool is_file_secure(int fd, const char *filename) { |
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402 |
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403 int result; |
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404 struct stat statbuf; |
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405 |
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406 // Determine if the file is secure. |
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407 RESTARTABLE(::fstat(fd, &statbuf), result); |
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408 if (result == OS_ERR) { |
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409 if (PrintMiscellaneous && Verbose) { |
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410 warning("fstat failed on %s: %s\n", filename, strerror(errno)); |
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411 } |
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412 return false; |
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413 } |
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414 if (statbuf.st_nlink > 1) { |
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415 // A file with multiple links is not expected. |
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416 if (PrintMiscellaneous && Verbose) { |
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417 warning("file %s has multiple links\n", filename); |
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418 } |
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419 return false; |
| 3960 | 420 } |
| 421 return true; | |
| 422 } | |
| 423 | |
| 424 // return the user name for the given user id | |
| 425 // | |
| 426 // the caller is expected to free the allocated memory. | |
| 427 // | |
| 428 static char* get_user_name(uid_t uid) { | |
| 429 | |
| 430 struct passwd pwent; | |
| 431 | |
| 432 // determine the max pwbuf size from sysconf, and hardcode | |
| 433 // a default if this not available through sysconf. | |
| 434 // | |
| 435 long bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); | |
| 436 if (bufsize == -1) | |
| 437 bufsize = 1024; | |
| 438 | |
| 6197 | 439 char* pwbuf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
| 3960 | 440 |
| 441 // POSIX interface to getpwuid_r is used on LINUX | |
| 442 struct passwd* p; | |
| 443 int result = getpwuid_r(uid, &pwent, pwbuf, (size_t)bufsize, &p); | |
| 444 | |
| 445 if (result != 0 || p == NULL || p->pw_name == NULL || *(p->pw_name) == '\0') { | |
| 446 if (PrintMiscellaneous && Verbose) { | |
| 447 if (result != 0) { | |
| 448 warning("Could not retrieve passwd entry: %s\n", | |
| 449 strerror(result)); | |
| 450 } | |
| 451 else if (p == NULL) { | |
| 452 // this check is added to protect against an observed problem | |
| 453 // with getpwuid_r() on RedHat 9 where getpwuid_r returns 0, | |
| 454 // indicating success, but has p == NULL. This was observed when | |
| 455 // inserting a file descriptor exhaustion fault prior to the call | |
| 456 // getpwuid_r() call. In this case, error is set to the appropriate | |
| 457 // error condition, but this is undocumented behavior. This check | |
| 458 // is safe under any condition, but the use of errno in the output | |
| 459 // message may result in an erroneous message. | |
| 460 // Bug Id 89052 was opened with RedHat. | |
| 461 // | |
| 462 warning("Could not retrieve passwd entry: %s\n", | |
| 463 strerror(errno)); | |
| 464 } | |
| 465 else { | |
| 466 warning("Could not determine user name: %s\n", | |
| 467 p->pw_name == NULL ? "pw_name = NULL" : | |
| 468 "pw_name zero length"); | |
| 469 } | |
| 470 } | |
| 6197 | 471 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
| 3960 | 472 return NULL; |
| 473 } | |
| 474 | |
| 6197 | 475 char* user_name = NEW_C_HEAP_ARRAY(char, strlen(p->pw_name) + 1, mtInternal); |
| 3960 | 476 strcpy(user_name, p->pw_name); |
| 477 | |
| 6197 | 478 FREE_C_HEAP_ARRAY(char, pwbuf, mtInternal); |
| 3960 | 479 return user_name; |
| 480 } | |
| 481 | |
| 482 // return the name of the user that owns the process identified by vmid. | |
| 483 // | |
| 484 // This method uses a slow directory search algorithm to find the backing | |
| 485 // store file for the specified vmid and returns the user name, as determined | |
| 486 // by the user name suffix of the hsperfdata_<username> directory name. | |
| 487 // | |
| 488 // the caller is expected to free the allocated memory. | |
| 489 // | |
| 490 static char* get_user_name_slow(int vmid, TRAPS) { | |
| 491 | |
| 492 // short circuit the directory search if the process doesn't even exist. | |
| 493 if (kill(vmid, 0) == OS_ERR) { | |
| 494 if (errno == ESRCH) { | |
| 495 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), | |
| 496 "Process not found"); | |
| 497 } | |
| 498 else /* EPERM */ { | |
| 499 THROW_MSG_0(vmSymbols::java_io_IOException(), strerror(errno)); | |
| 500 } | |
| 501 } | |
| 502 | |
| 503 // directory search | |
| 504 char* oldest_user = NULL; | |
| 505 time_t oldest_ctime = 0; | |
| 506 | |
| 507 const char* tmpdirname = os::get_temp_directory(); | |
| 508 | |
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509 // open the temp directory |
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510 DIR* tmpdirp = os::opendir(tmpdirname); |
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511 |
| 3960 | 512 if (tmpdirp == NULL) { |
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513 // Cannot open the directory to get the user name, return. |
| 3960 | 514 return NULL; |
| 515 } | |
| 516 | |
| 517 // for each entry in the directory that matches the pattern hsperfdata_*, | |
| 518 // open the directory and check if the file for the given vmid exists. | |
| 519 // The file with the expected name and the latest creation date is used | |
| 520 // to determine the user name for the process id. | |
| 521 // | |
| 522 struct dirent* dentry; | |
| 6197 | 523 char* tdbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(tmpdirname), mtInternal); |
| 3960 | 524 errno = 0; |
| 525 while ((dentry = os::readdir(tmpdirp, (struct dirent *)tdbuf)) != NULL) { | |
| 526 | |
| 527 // check if the directory entry is a hsperfdata file | |
| 528 if (strncmp(dentry->d_name, PERFDATA_NAME, strlen(PERFDATA_NAME)) != 0) { | |
| 529 continue; | |
| 530 } | |
| 531 | |
| 532 char* usrdir_name = NEW_C_HEAP_ARRAY(char, | |
| 6197 | 533 strlen(tmpdirname) + strlen(dentry->d_name) + 2, mtInternal); |
| 3960 | 534 strcpy(usrdir_name, tmpdirname); |
| 535 strcat(usrdir_name, "/"); | |
| 536 strcat(usrdir_name, dentry->d_name); | |
| 537 | |
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538 // open the user directory |
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539 DIR* subdirp = open_directory_secure(usrdir_name); |
| 3960 | 540 |
| 541 if (subdirp == NULL) { | |
| 6197 | 542 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); |
| 3960 | 543 continue; |
| 544 } | |
| 545 | |
| 546 struct dirent* udentry; | |
| 6197 | 547 char* udbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(usrdir_name), mtInternal); |
| 3960 | 548 errno = 0; |
| 549 while ((udentry = os::readdir(subdirp, (struct dirent *)udbuf)) != NULL) { | |
| 550 | |
| 551 if (filename_to_pid(udentry->d_name) == vmid) { | |
| 552 struct stat statbuf; | |
| 553 int result; | |
| 554 | |
| 555 char* filename = NEW_C_HEAP_ARRAY(char, | |
| 6197 | 556 strlen(usrdir_name) + strlen(udentry->d_name) + 2, mtInternal); |
| 3960 | 557 |
| 558 strcpy(filename, usrdir_name); | |
| 559 strcat(filename, "/"); | |
| 560 strcat(filename, udentry->d_name); | |
| 561 | |
| 562 // don't follow symbolic links for the file | |
| 563 RESTARTABLE(::lstat(filename, &statbuf), result); | |
| 564 if (result == OS_ERR) { | |
| 6197 | 565 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 3960 | 566 continue; |
| 567 } | |
| 568 | |
| 569 // skip over files that are not regular files. | |
| 570 if (!S_ISREG(statbuf.st_mode)) { | |
| 6197 | 571 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 3960 | 572 continue; |
| 573 } | |
| 574 | |
| 575 // compare and save filename with latest creation time | |
| 576 if (statbuf.st_size > 0 && statbuf.st_ctime > oldest_ctime) { | |
| 577 | |
| 578 if (statbuf.st_ctime > oldest_ctime) { | |
| 579 char* user = strchr(dentry->d_name, '_') + 1; | |
| 580 | |
| 6197 | 581 if (oldest_user != NULL) FREE_C_HEAP_ARRAY(char, oldest_user, mtInternal); |
| 582 oldest_user = NEW_C_HEAP_ARRAY(char, strlen(user)+1, mtInternal); | |
| 3960 | 583 |
| 584 strcpy(oldest_user, user); | |
| 585 oldest_ctime = statbuf.st_ctime; | |
| 586 } | |
| 587 } | |
| 588 | |
| 6197 | 589 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 3960 | 590 } |
| 591 } | |
| 592 os::closedir(subdirp); | |
| 6197 | 593 FREE_C_HEAP_ARRAY(char, udbuf, mtInternal); |
| 594 FREE_C_HEAP_ARRAY(char, usrdir_name, mtInternal); | |
| 3960 | 595 } |
| 596 os::closedir(tmpdirp); | |
| 6197 | 597 FREE_C_HEAP_ARRAY(char, tdbuf, mtInternal); |
| 3960 | 598 |
| 599 return(oldest_user); | |
| 600 } | |
| 601 | |
| 602 // return the name of the user that owns the JVM indicated by the given vmid. | |
| 603 // | |
| 604 static char* get_user_name(int vmid, TRAPS) { | |
| 605 return get_user_name_slow(vmid, CHECK_NULL); | |
| 606 } | |
| 607 | |
| 608 // return the file name of the backing store file for the named | |
| 609 // shared memory region for the given user name and vmid. | |
| 610 // | |
| 611 // the caller is expected to free the allocated memory. | |
| 612 // | |
| 613 static char* get_sharedmem_filename(const char* dirname, int vmid) { | |
| 614 | |
| 615 // add 2 for the file separator and a null terminator. | |
| 616 size_t nbytes = strlen(dirname) + UINT_CHARS + 2; | |
| 617 | |
| 6197 | 618 char* name = NEW_C_HEAP_ARRAY(char, nbytes, mtInternal); |
| 3960 | 619 snprintf(name, nbytes, "%s/%d", dirname, vmid); |
| 620 | |
| 621 return name; | |
| 622 } | |
| 623 | |
| 624 | |
| 625 // remove file | |
| 626 // | |
| 627 // this method removes the file specified by the given path | |
| 628 // | |
| 629 static void remove_file(const char* path) { | |
| 630 | |
| 631 int result; | |
| 632 | |
| 633 // if the file is a directory, the following unlink will fail. since | |
| 634 // we don't expect to find directories in the user temp directory, we | |
| 635 // won't try to handle this situation. even if accidentially or | |
| 636 // maliciously planted, the directory's presence won't hurt anything. | |
| 637 // | |
| 638 RESTARTABLE(::unlink(path), result); | |
| 639 if (PrintMiscellaneous && Verbose && result == OS_ERR) { | |
| 640 if (errno != ENOENT) { | |
| 641 warning("Could not unlink shared memory backing" | |
| 642 " store file %s : %s\n", path, strerror(errno)); | |
| 643 } | |
| 644 } | |
| 645 } | |
| 646 | |
| 647 | |
| 648 // cleanup stale shared memory resources | |
| 649 // | |
| 650 // This method attempts to remove all stale shared memory files in | |
| 651 // the named user temporary directory. It scans the named directory | |
| 652 // for files matching the pattern ^$[0-9]*$. For each file found, the | |
| 653 // process id is extracted from the file name and a test is run to | |
| 654 // determine if the process is alive. If the process is not alive, | |
| 655 // any stale file resources are removed. | |
| 656 // | |
| 657 static void cleanup_sharedmem_resources(const char* dirname) { | |
| 658 | |
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659 int saved_cwd_fd; |
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660 // open the directory and set the current working directory to it |
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661 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
| 3960 | 662 if (dirp == NULL) { |
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663 // directory doesn't exist or is insecure, so there is nothing to cleanup |
| 3960 | 664 return; |
| 665 } | |
| 666 | |
| 667 // for each entry in the directory that matches the expected file | |
| 668 // name pattern, determine if the file resources are stale and if | |
| 669 // so, remove the file resources. Note, instrumented HotSpot processes | |
| 670 // for this user may start and/or terminate during this search and | |
| 671 // remove or create new files in this directory. The behavior of this | |
| 672 // loop under these conditions is dependent upon the implementation of | |
| 673 // opendir/readdir. | |
| 674 // | |
| 675 struct dirent* entry; | |
| 6197 | 676 char* dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(dirname), mtInternal); |
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677 |
| 3960 | 678 errno = 0; |
| 679 while ((entry = os::readdir(dirp, (struct dirent *)dbuf)) != NULL) { | |
| 680 | |
| 681 pid_t pid = filename_to_pid(entry->d_name); | |
| 682 | |
| 683 if (pid == 0) { | |
| 684 | |
| 685 if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) { | |
| 686 | |
| 687 // attempt to remove all unexpected files, except "." and ".." | |
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688 unlink(entry->d_name); |
| 3960 | 689 } |
| 690 | |
| 691 errno = 0; | |
| 692 continue; | |
| 693 } | |
| 694 | |
| 695 // we now have a file name that converts to a valid integer | |
| 696 // that could represent a process id . if this process id | |
| 697 // matches the current process id or the process is not running, | |
| 698 // then remove the stale file resources. | |
| 699 // | |
| 700 // process liveness is detected by sending signal number 0 to | |
| 701 // the process id (see kill(2)). if kill determines that the | |
| 702 // process does not exist, then the file resources are removed. | |
| 703 // if kill determines that that we don't have permission to | |
| 704 // signal the process, then the file resources are assumed to | |
| 705 // be stale and are removed because the resources for such a | |
| 706 // process should be in a different user specific directory. | |
| 707 // | |
| 708 if ((pid == os::current_process_id()) || | |
| 709 (kill(pid, 0) == OS_ERR && (errno == ESRCH || errno == EPERM))) { | |
| 710 | |
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711 unlink(entry->d_name); |
| 3960 | 712 } |
| 713 errno = 0; | |
| 714 } | |
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715 |
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716 // close the directory and reset the current working directory |
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717 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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718 |
| 6197 | 719 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); |
| 3960 | 720 } |
| 721 | |
| 722 // make the user specific temporary directory. Returns true if | |
| 723 // the directory exists and is secure upon return. Returns false | |
| 724 // if the directory exists but is either a symlink, is otherwise | |
| 725 // insecure, or if an error occurred. | |
| 726 // | |
| 727 static bool make_user_tmp_dir(const char* dirname) { | |
| 728 | |
| 729 // create the directory with 0755 permissions. note that the directory | |
| 730 // will be owned by euid::egid, which may not be the same as uid::gid. | |
| 731 // | |
| 732 if (mkdir(dirname, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) == OS_ERR) { | |
| 733 if (errno == EEXIST) { | |
| 734 // The directory already exists and was probably created by another | |
| 735 // JVM instance. However, this could also be the result of a | |
| 736 // deliberate symlink. Verify that the existing directory is safe. | |
| 737 // | |
| 738 if (!is_directory_secure(dirname)) { | |
| 739 // directory is not secure | |
| 740 if (PrintMiscellaneous && Verbose) { | |
| 741 warning("%s directory is insecure\n", dirname); | |
| 742 } | |
| 743 return false; | |
| 744 } | |
| 745 } | |
| 746 else { | |
| 747 // we encountered some other failure while attempting | |
| 748 // to create the directory | |
| 749 // | |
| 750 if (PrintMiscellaneous && Verbose) { | |
| 751 warning("could not create directory %s: %s\n", | |
| 752 dirname, strerror(errno)); | |
| 753 } | |
| 754 return false; | |
| 755 } | |
| 756 } | |
| 757 return true; | |
| 758 } | |
| 759 | |
| 760 // create the shared memory file resources | |
| 761 // | |
| 762 // This method creates the shared memory file with the given size | |
| 763 // This method also creates the user specific temporary directory, if | |
| 764 // it does not yet exist. | |
| 765 // | |
| 766 static int create_sharedmem_resources(const char* dirname, const char* filename, size_t size) { | |
| 767 | |
| 768 // make the user temporary directory | |
| 769 if (!make_user_tmp_dir(dirname)) { | |
| 770 // could not make/find the directory or the found directory | |
| 771 // was not secure | |
| 772 return -1; | |
| 773 } | |
| 774 | |
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775 int saved_cwd_fd; |
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776 // open the directory and set the current working directory to it |
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777 DIR* dirp = open_directory_secure_cwd(dirname, &saved_cwd_fd); |
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778 if (dirp == NULL) { |
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779 // Directory doesn't exist or is insecure, so cannot create shared |
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780 // memory file. |
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781 return -1; |
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782 } |
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783 |
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784 // Open the filename in the current directory. |
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785 // Cannot use O_TRUNC here; truncation of an existing file has to happen |
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786 // after the is_file_secure() check below. |
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787 int result; |
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788 RESTARTABLE(::open(filename, O_RDWR|O_CREAT|O_NOFOLLOW, S_IREAD|S_IWRITE), result); |
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789 if (result == OS_ERR) { |
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790 if (PrintMiscellaneous && Verbose) { |
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791 if (errno == ELOOP) { |
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792 warning("file %s is a symlink and is not secure\n", filename); |
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793 } else { |
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794 warning("could not create file %s: %s\n", filename, strerror(errno)); |
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795 } |
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796 } |
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797 // close the directory and reset the current working directory |
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798 close_directory_secure_cwd(dirp, saved_cwd_fd); |
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799 |
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800 return -1; |
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801 } |
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802 // close the directory and reset the current working directory |
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803 close_directory_secure_cwd(dirp, saved_cwd_fd); |
| 3960 | 804 |
| 805 // save the file descriptor | |
| 806 int fd = result; | |
| 807 | |
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808 // check to see if the file is secure |
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809 if (!is_file_secure(fd, filename)) { |
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810 ::close(fd); |
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811 return -1; |
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812 } |
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813 |
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814 // truncate the file to get rid of any existing data |
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815 RESTARTABLE(::ftruncate(fd, (off_t)0), result); |
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816 if (result == OS_ERR) { |
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817 if (PrintMiscellaneous && Verbose) { |
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818 warning("could not truncate shared memory file: %s\n", strerror(errno)); |
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819 } |
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820 ::close(fd); |
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821 return -1; |
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822 } |
| 3960 | 823 // set the file size |
| 824 RESTARTABLE(::ftruncate(fd, (off_t)size), result); | |
| 825 if (result == OS_ERR) { | |
| 826 if (PrintMiscellaneous && Verbose) { | |
| 827 warning("could not set shared memory file size: %s\n", strerror(errno)); | |
| 828 } | |
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829 ::close(fd); |
| 3960 | 830 return -1; |
| 831 } | |
| 832 | |
| 833 // Verify that we have enough disk space for this file. | |
| 834 // We'll get random SIGBUS crashes on memory accesses if | |
| 835 // we don't. | |
| 836 | |
| 837 for (size_t seekpos = 0; seekpos < size; seekpos += os::vm_page_size()) { | |
| 838 int zero_int = 0; | |
| 839 result = (int)os::seek_to_file_offset(fd, (jlong)(seekpos)); | |
| 840 if (result == -1 ) break; | |
| 841 RESTARTABLE(::write(fd, &zero_int, 1), result); | |
| 842 if (result != 1) { | |
| 843 if (errno == ENOSPC) { | |
| 844 warning("Insufficient space for shared memory file:\n %s\nTry using the -Djava.io.tmpdir= option to select an alternate temp location.\n", filename); | |
| 845 } | |
| 846 break; | |
| 847 } | |
| 848 } | |
| 849 | |
| 850 if (result != -1) { | |
| 851 return fd; | |
| 852 } else { | |
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853 ::close(fd); |
| 3960 | 854 return -1; |
| 855 } | |
| 856 } | |
| 857 | |
| 858 // open the shared memory file for the given user and vmid. returns | |
| 859 // the file descriptor for the open file or -1 if the file could not | |
| 860 // be opened. | |
| 861 // | |
| 862 static int open_sharedmem_file(const char* filename, int oflags, TRAPS) { | |
| 863 | |
| 864 // open the file | |
| 865 int result; | |
| 866 RESTARTABLE(::open(filename, oflags), result); | |
| 867 if (result == OS_ERR) { | |
| 868 if (errno == ENOENT) { | |
|
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869 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
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870 "Process not found", OS_ERR); |
| 3960 | 871 } |
| 872 else if (errno == EACCES) { | |
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873 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), |
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874 "Permission denied", OS_ERR); |
| 3960 | 875 } |
| 876 else { | |
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877 THROW_MSG_(vmSymbols::java_io_IOException(), strerror(errno), OS_ERR); |
| 3960 | 878 } |
| 879 } | |
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880 int fd = result; |
| 3960 | 881 |
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882 // check to see if the file is secure |
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883 if (!is_file_secure(fd, filename)) { |
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884 ::close(fd); |
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885 return -1; |
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886 } |
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887 |
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888 return fd; |
| 3960 | 889 } |
| 890 | |
| 891 // create a named shared memory region. returns the address of the | |
| 892 // memory region on success or NULL on failure. A return value of | |
| 893 // NULL will ultimately disable the shared memory feature. | |
| 894 // | |
| 895 // On Solaris and Bsd, the name space for shared memory objects | |
| 896 // is the file system name space. | |
| 897 // | |
| 898 // A monitoring application attaching to a JVM does not need to know | |
| 899 // the file system name of the shared memory object. However, it may | |
| 900 // be convenient for applications to discover the existence of newly | |
| 901 // created and terminating JVMs by watching the file system name space | |
| 902 // for files being created or removed. | |
| 903 // | |
| 904 static char* mmap_create_shared(size_t size) { | |
| 905 | |
| 906 int result; | |
| 907 int fd; | |
| 908 char* mapAddress; | |
| 909 | |
| 910 int vmid = os::current_process_id(); | |
| 911 | |
| 912 char* user_name = get_user_name(geteuid()); | |
| 913 | |
| 914 if (user_name == NULL) | |
| 915 return NULL; | |
| 916 | |
| 917 char* dirname = get_user_tmp_dir(user_name); | |
| 918 char* filename = get_sharedmem_filename(dirname, vmid); | |
| 919 | |
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920 // get the short filename |
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921 char* short_filename = strrchr(filename, '/'); |
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922 if (short_filename == NULL) { |
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923 short_filename = filename; |
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924 } else { |
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925 short_filename++; |
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926 } |
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927 |
| 3960 | 928 // cleanup any stale shared memory files |
| 929 cleanup_sharedmem_resources(dirname); | |
| 930 | |
| 931 assert(((size > 0) && (size % os::vm_page_size() == 0)), | |
| 932 "unexpected PerfMemory region size"); | |
| 933 | |
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934 fd = create_sharedmem_resources(dirname, short_filename, size); |
| 3960 | 935 |
| 6197 | 936 FREE_C_HEAP_ARRAY(char, user_name, mtInternal); |
| 937 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
| 3960 | 938 |
| 939 if (fd == -1) { | |
| 6197 | 940 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 3960 | 941 return NULL; |
| 942 } | |
| 943 | |
| 944 mapAddress = (char*)::mmap((char*)0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
| 945 | |
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946 result = ::close(fd); |
| 3960 | 947 assert(result != OS_ERR, "could not close file"); |
| 948 | |
| 949 if (mapAddress == MAP_FAILED) { | |
| 950 if (PrintMiscellaneous && Verbose) { | |
| 951 warning("mmap failed - %s\n", strerror(errno)); | |
| 952 } | |
| 953 remove_file(filename); | |
| 6197 | 954 FREE_C_HEAP_ARRAY(char, filename, mtInternal); |
| 3960 | 955 return NULL; |
| 956 } | |
| 957 | |
| 958 // save the file name for use in delete_shared_memory() | |
| 959 backing_store_file_name = filename; | |
| 960 | |
| 961 // clear the shared memory region | |
| 962 (void)::memset((void*) mapAddress, 0, size); | |
| 963 | |
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964 // it does not go through os api, the operation has to record from here |
| 20360 | 965 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC, mtInternal); |
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966 |
| 3960 | 967 return mapAddress; |
| 968 } | |
| 969 | |
| 970 // release a named shared memory region | |
| 971 // | |
| 972 static void unmap_shared(char* addr, size_t bytes) { | |
| 973 os::release_memory(addr, bytes); | |
| 974 } | |
| 975 | |
| 976 // create the PerfData memory region in shared memory. | |
| 977 // | |
| 978 static char* create_shared_memory(size_t size) { | |
| 979 | |
| 980 // create the shared memory region. | |
| 981 return mmap_create_shared(size); | |
| 982 } | |
| 983 | |
| 984 // delete the shared PerfData memory region | |
| 985 // | |
| 986 static void delete_shared_memory(char* addr, size_t size) { | |
| 987 | |
| 988 // cleanup the persistent shared memory resources. since DestroyJavaVM does | |
| 989 // not support unloading of the JVM, unmapping of the memory resource is | |
| 990 // not performed. The memory will be reclaimed by the OS upon termination of | |
| 991 // the process. The backing store file is deleted from the file system. | |
| 992 | |
| 993 assert(!PerfDisableSharedMem, "shouldn't be here"); | |
| 994 | |
| 995 if (backing_store_file_name != NULL) { | |
| 996 remove_file(backing_store_file_name); | |
| 997 // Don't.. Free heap memory could deadlock os::abort() if it is called | |
| 998 // from signal handler. OS will reclaim the heap memory. | |
| 999 // FREE_C_HEAP_ARRAY(char, backing_store_file_name); | |
| 1000 backing_store_file_name = NULL; | |
| 1001 } | |
| 1002 } | |
| 1003 | |
| 1004 // return the size of the file for the given file descriptor | |
| 1005 // or 0 if it is not a valid size for a shared memory file | |
| 1006 // | |
| 1007 static size_t sharedmem_filesize(int fd, TRAPS) { | |
| 1008 | |
| 1009 struct stat statbuf; | |
| 1010 int result; | |
| 1011 | |
| 1012 RESTARTABLE(::fstat(fd, &statbuf), result); | |
| 1013 if (result == OS_ERR) { | |
| 1014 if (PrintMiscellaneous && Verbose) { | |
| 1015 warning("fstat failed: %s\n", strerror(errno)); | |
| 1016 } | |
| 1017 THROW_MSG_0(vmSymbols::java_io_IOException(), | |
| 1018 "Could not determine PerfMemory size"); | |
| 1019 } | |
| 1020 | |
| 1021 if ((statbuf.st_size == 0) || | |
| 1022 ((size_t)statbuf.st_size % os::vm_page_size() != 0)) { | |
| 1023 THROW_MSG_0(vmSymbols::java_lang_Exception(), | |
| 1024 "Invalid PerfMemory size"); | |
| 1025 } | |
| 1026 | |
| 1027 return (size_t)statbuf.st_size; | |
| 1028 } | |
| 1029 | |
| 1030 // attach to a named shared memory region. | |
| 1031 // | |
| 1032 static void mmap_attach_shared(const char* user, int vmid, PerfMemory::PerfMemoryMode mode, char** addr, size_t* sizep, TRAPS) { | |
| 1033 | |
| 1034 char* mapAddress; | |
| 1035 int result; | |
| 1036 int fd; | |
|
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1037 size_t size = 0; |
| 3960 | 1038 const char* luser = NULL; |
| 1039 | |
| 1040 int mmap_prot; | |
| 1041 int file_flags; | |
| 1042 | |
| 1043 ResourceMark rm; | |
| 1044 | |
| 1045 // map the high level access mode to the appropriate permission | |
| 1046 // constructs for the file and the shared memory mapping. | |
| 1047 if (mode == PerfMemory::PERF_MODE_RO) { | |
| 1048 mmap_prot = PROT_READ; | |
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1049 file_flags = O_RDONLY | O_NOFOLLOW; |
| 3960 | 1050 } |
| 1051 else if (mode == PerfMemory::PERF_MODE_RW) { | |
| 1052 #ifdef LATER | |
| 1053 mmap_prot = PROT_READ | PROT_WRITE; | |
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1054 file_flags = O_RDWR | O_NOFOLLOW; |
| 3960 | 1055 #else |
| 1056 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
| 1057 "Unsupported access mode"); | |
| 1058 #endif | |
| 1059 } | |
| 1060 else { | |
| 1061 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
| 1062 "Illegal access mode"); | |
| 1063 } | |
| 1064 | |
| 1065 if (user == NULL || strlen(user) == 0) { | |
| 1066 luser = get_user_name(vmid, CHECK); | |
| 1067 } | |
| 1068 else { | |
| 1069 luser = user; | |
| 1070 } | |
| 1071 | |
| 1072 if (luser == NULL) { | |
| 1073 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
| 1074 "Could not map vmid to user Name"); | |
| 1075 } | |
| 1076 | |
| 1077 char* dirname = get_user_tmp_dir(luser); | |
| 1078 | |
| 1079 // since we don't follow symbolic links when creating the backing | |
| 1080 // store file, we don't follow them when attaching either. | |
| 1081 // | |
| 1082 if (!is_directory_secure(dirname)) { | |
| 6197 | 1083 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); |
| 3960 | 1084 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), |
| 1085 "Process not found"); | |
| 1086 } | |
| 1087 | |
| 1088 char* filename = get_sharedmem_filename(dirname, vmid); | |
| 1089 | |
| 1090 // copy heap memory to resource memory. the open_sharedmem_file | |
| 1091 // method below need to use the filename, but could throw an | |
| 1092 // exception. using a resource array prevents the leak that | |
| 1093 // would otherwise occur. | |
| 1094 char* rfilename = NEW_RESOURCE_ARRAY(char, strlen(filename) + 1); | |
| 1095 strcpy(rfilename, filename); | |
| 1096 | |
| 1097 // free the c heap resources that are no longer needed | |
| 6197 | 1098 if (luser != user) FREE_C_HEAP_ARRAY(char, luser, mtInternal); |
| 1099 FREE_C_HEAP_ARRAY(char, dirname, mtInternal); | |
| 1100 FREE_C_HEAP_ARRAY(char, filename, mtInternal); | |
| 3960 | 1101 |
| 1102 // open the shared memory file for the give vmid | |
| 1103 fd = open_sharedmem_file(rfilename, file_flags, CHECK); | |
| 1104 assert(fd != OS_ERR, "unexpected value"); | |
| 1105 | |
| 1106 if (*sizep == 0) { | |
| 1107 size = sharedmem_filesize(fd, CHECK); | |
|
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1108 } else { |
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1109 size = *sizep; |
| 3960 | 1110 } |
| 1111 | |
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1112 assert(size > 0, "unexpected size <= 0"); |
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1113 |
| 3960 | 1114 mapAddress = (char*)::mmap((char*)0, size, mmap_prot, MAP_SHARED, fd, 0); |
| 1115 | |
| 1116 // attempt to close the file - restart if it gets interrupted, | |
| 1117 // but ignore other failures | |
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1118 result = ::close(fd); |
| 3960 | 1119 assert(result != OS_ERR, "could not close file"); |
| 1120 | |
| 1121 if (mapAddress == MAP_FAILED) { | |
| 1122 if (PrintMiscellaneous && Verbose) { | |
| 1123 warning("mmap failed: %s\n", strerror(errno)); | |
| 1124 } | |
| 1125 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), | |
| 1126 "Could not map PerfMemory"); | |
| 1127 } | |
| 1128 | |
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1129 // it does not go through os api, the operation has to record from here |
| 20360 | 1130 MemTracker::record_virtual_memory_reserve_and_commit((address)mapAddress, size, CURRENT_PC, mtInternal); |
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1131 |
| 3960 | 1132 *addr = mapAddress; |
| 1133 *sizep = size; | |
| 1134 | |
| 1135 if (PerfTraceMemOps) { | |
| 1136 tty->print("mapped " SIZE_FORMAT " bytes for vmid %d at " | |
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1137 INTPTR_FORMAT "\n", size, vmid, p2i((void*)mapAddress)); |
| 3960 | 1138 } |
| 1139 } | |
| 1140 | |
| 1141 | |
| 1142 | |
| 1143 | |
| 1144 // create the PerfData memory region | |
| 1145 // | |
| 1146 // This method creates the memory region used to store performance | |
| 1147 // data for the JVM. The memory may be created in standard or | |
| 1148 // shared memory. | |
| 1149 // | |
| 1150 void PerfMemory::create_memory_region(size_t size) { | |
| 1151 | |
| 1152 if (PerfDisableSharedMem) { | |
| 1153 // do not share the memory for the performance data. | |
| 1154 _start = create_standard_memory(size); | |
| 1155 } | |
| 1156 else { | |
| 1157 _start = create_shared_memory(size); | |
| 1158 if (_start == NULL) { | |
| 1159 | |
| 1160 // creation of the shared memory region failed, attempt | |
| 1161 // to create a contiguous, non-shared memory region instead. | |
| 1162 // | |
| 1163 if (PrintMiscellaneous && Verbose) { | |
| 1164 warning("Reverting to non-shared PerfMemory region.\n"); | |
| 1165 } | |
| 1166 PerfDisableSharedMem = true; | |
| 1167 _start = create_standard_memory(size); | |
| 1168 } | |
| 1169 } | |
| 1170 | |
| 1171 if (_start != NULL) _capacity = size; | |
| 1172 | |
| 1173 } | |
| 1174 | |
| 1175 // delete the PerfData memory region | |
| 1176 // | |
| 1177 // This method deletes the memory region used to store performance | |
| 1178 // data for the JVM. The memory region indicated by the <address, size> | |
| 1179 // tuple will be inaccessible after a call to this method. | |
| 1180 // | |
| 1181 void PerfMemory::delete_memory_region() { | |
| 1182 | |
| 1183 assert((start() != NULL && capacity() > 0), "verify proper state"); | |
| 1184 | |
| 1185 // If user specifies PerfDataSaveFile, it will save the performance data | |
| 1186 // to the specified file name no matter whether PerfDataSaveToFile is specified | |
| 1187 // or not. In other word, -XX:PerfDataSaveFile=.. overrides flag | |
| 1188 // -XX:+PerfDataSaveToFile. | |
| 1189 if (PerfDataSaveToFile || PerfDataSaveFile != NULL) { | |
| 1190 save_memory_to_file(start(), capacity()); | |
| 1191 } | |
| 1192 | |
| 1193 if (PerfDisableSharedMem) { | |
| 1194 delete_standard_memory(start(), capacity()); | |
| 1195 } | |
| 1196 else { | |
| 1197 delete_shared_memory(start(), capacity()); | |
| 1198 } | |
| 1199 } | |
| 1200 | |
| 1201 // attach to the PerfData memory region for another JVM | |
| 1202 // | |
| 1203 // This method returns an <address, size> tuple that points to | |
| 1204 // a memory buffer that is kept reasonably synchronized with | |
| 1205 // the PerfData memory region for the indicated JVM. This | |
| 1206 // buffer may be kept in synchronization via shared memory | |
| 1207 // or some other mechanism that keeps the buffer updated. | |
| 1208 // | |
| 1209 // If the JVM chooses not to support the attachability feature, | |
| 1210 // this method should throw an UnsupportedOperation exception. | |
| 1211 // | |
| 1212 // This implementation utilizes named shared memory to map | |
| 1213 // the indicated process's PerfData memory region into this JVMs | |
| 1214 // address space. | |
| 1215 // | |
| 1216 void PerfMemory::attach(const char* user, int vmid, PerfMemoryMode mode, char** addrp, size_t* sizep, TRAPS) { | |
| 1217 | |
| 1218 if (vmid == 0 || vmid == os::current_process_id()) { | |
| 1219 *addrp = start(); | |
| 1220 *sizep = capacity(); | |
| 1221 return; | |
| 1222 } | |
| 1223 | |
| 1224 mmap_attach_shared(user, vmid, mode, addrp, sizep, CHECK); | |
| 1225 } | |
| 1226 | |
| 1227 // detach from the PerfData memory region of another JVM | |
| 1228 // | |
| 1229 // This method detaches the PerfData memory region of another | |
| 1230 // JVM, specified as an <address, size> tuple of a buffer | |
| 1231 // in this process's address space. This method may perform | |
| 1232 // arbitrary actions to accomplish the detachment. The memory | |
| 1233 // region specified by <address, size> will be inaccessible after | |
| 1234 // a call to this method. | |
| 1235 // | |
| 1236 // If the JVM chooses not to support the attachability feature, | |
| 1237 // this method should throw an UnsupportedOperation exception. | |
| 1238 // | |
| 1239 // This implementation utilizes named shared memory to detach | |
| 1240 // the indicated process's PerfData memory region from this | |
| 1241 // process's address space. | |
| 1242 // | |
| 1243 void PerfMemory::detach(char* addr, size_t bytes, TRAPS) { | |
| 1244 | |
| 1245 assert(addr != 0, "address sanity check"); | |
| 1246 assert(bytes > 0, "capacity sanity check"); | |
| 1247 | |
| 1248 if (PerfMemory::contains(addr) || PerfMemory::contains(addr + bytes - 1)) { | |
| 1249 // prevent accidental detachment of this process's PerfMemory region | |
| 1250 return; | |
| 1251 } | |
| 1252 | |
| 1253 unmap_shared(addr, bytes); | |
| 1254 } | |
| 1255 | |
| 1256 char* PerfMemory::backing_store_filename() { | |
| 1257 return backing_store_file_name; | |
| 1258 } |