Mercurial > hg > graal-compiler
annotate src/os/bsd/vm/perfMemory_bsd.cpp @ 20779:d7b6bdd51abe jdk8u31-b10
8050807: Better performing performance data handling
Reviewed-by: dcubed, pnauman, ctornqvi, dholmes, mschoene
Contributed-by: gerald.thornbrugh@oracle.com
author | gthornbr |
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date | Mon, 17 Nov 2014 15:51:46 -0500 |
parents | 78bbf4d43a14 |
children | 42f27b59c550 |
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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 |
3960 | 510 DIR* tmpdirp = os::opendir(tmpdirname); |
511 | |
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 } |
3960 | 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); |
3960 | 789 if (result == OS_ERR) { |
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 } |
3960 | 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 |
3960 | 800 return -1; |
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 |
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965 MemTracker::record_virtual_memory_reserve((address)mapAddress, size, mtInternal, CURRENT_PC); |
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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 |
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1130 MemTracker::record_virtual_memory_reserve((address)mapAddress, size, mtInternal, CURRENT_PC); |
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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 } |