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 <string.h>
26 #include <math.h>
27 #include <errno.h>
28 #include "utilities/globalDefinitions.hpp"
29 #include "memory/allocation.hpp"
30 #include "runtime/globals.hpp"
31 #include "runtime/os.hpp"
32 #include "logging/log.hpp"
33 #include "osContainer_linux.hpp"
34
35 /*
36 * PER_CPU_SHARES has been set to 1024 because CPU shares' quota
37 * is commonly used in cloud frameworks like Kubernetes[1],
38 * AWS[2] and Mesos[3] in a similar way. They spawn containers with
39 * --cpu-shares option values scaled by PER_CPU_SHARES. Thus, we do
40 * the inverse for determining the number of possible available
41 * CPUs to the JVM inside a container. See JDK-8216366.
42 *
43 * [1] https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/#meaning-of-cpu
44 * In particular:
45 * When using Docker:
46 * The spec.containers[].resources.requests.cpu is converted to its core value, which is potentially
47 * fractional, and multiplied by 1024. The greater of this number or 2 is used as the value of the
48 * --cpu-shares flag in the docker run command.
49 * [2] https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_ContainerDefinition.html
50 * [3] https://github.com/apache/mesos/blob/3478e344fb77d931f6122980c6e94cd3913c441d/src/docker/docker.cpp#L648
51 * https://github.com/apache/mesos/blob/3478e344fb77d931f6122980c6e94cd3913c441d/src/slave/containerizer/mesos/isolators/cgroups/constants.hpp#L30
52 */
53 #define PER_CPU_SHARES 1024
54
55 bool OSContainer::_is_initialized = false;
56 bool OSContainer::_is_containerized = false;
57 julong _unlimited_memory;
58
59 class CgroupSubsystem: CHeapObj<mtInternal> {
60 friend class OSContainer;
61
62 private:
63 /* mountinfo contents */
64 char *_root;
65 char *_mount_point;
66
67 /* Constructed subsystem directory */
68 char *_path;
69
70 public:
71 CgroupSubsystem(char *root, char *mountpoint) {
72 _root = os::strdup(root);
73 _mount_point = os::strdup(mountpoint);
74 _path = NULL;
75 }
76
77 /*
78 * Set directory to subsystem specific files based
79 * on the contents of the mountinfo and cgroup files.
80 */
81 void set_subsystem_path(char *cgroup_path) {
82 char buf[MAXPATHLEN+1];
83 if (_root != NULL && cgroup_path != NULL) {
84 if (strcmp(_root, "/") == 0) {
85 int buflen;
86 strncpy(buf, _mount_point, MAXPATHLEN);
87 buf[MAXPATHLEN-1] = '\0';
88 if (strcmp(cgroup_path,"/") != 0) {
89 buflen = strlen(buf);
90 if ((buflen + strlen(cgroup_path)) > (MAXPATHLEN-1)) {
91 return;
92 }
93 strncat(buf, cgroup_path, MAXPATHLEN-buflen);
94 buf[MAXPATHLEN-1] = '\0';
95 }
96 _path = os::strdup(buf);
97 } else {
98 if (strcmp(_root, cgroup_path) == 0) {
99 strncpy(buf, _mount_point, MAXPATHLEN);
100 buf[MAXPATHLEN-1] = '\0';
101 _path = os::strdup(buf);
102 } else {
103 char *p = strstr(cgroup_path, _root);
104 if (p != NULL && p == _root) {
105 if (strlen(cgroup_path) > strlen(_root)) {
106 int buflen;
107 strncpy(buf, _mount_point, MAXPATHLEN);
108 buf[MAXPATHLEN-1] = '\0';
109 buflen = strlen(buf);
110 if ((buflen + strlen(cgroup_path) - strlen(_root)) > (MAXPATHLEN-1)) {
111 return;
112 }
113 strncat(buf, cgroup_path + strlen(_root), MAXPATHLEN-buflen);
114 buf[MAXPATHLEN-1] = '\0';
115 _path = os::strdup(buf);
116 }
117 }
118 }
119 }
120 }
121 }
122
123 char *subsystem_path() { return _path; }
124 };
125
126 class CgroupMemorySubsystem: CgroupSubsystem {
127 friend class OSContainer;
128
129 private:
130 /* Some container runtimes set limits via cgroup
131 * hierarchy. If set to true consider also memory.stat
132 * file if everything else seems unlimited */
133 bool _uses_mem_hierarchy;
134
135 public:
136 CgroupMemorySubsystem(char *root, char *mountpoint) : CgroupSubsystem::CgroupSubsystem(root, mountpoint) {
137 _uses_mem_hierarchy = false;
138 }
139
140 bool is_hierarchical() { return _uses_mem_hierarchy; }
141 void set_hierarchical(bool value) { _uses_mem_hierarchy = value; }
142 };
143
144 CgroupMemorySubsystem* memory = NULL;
145 CgroupSubsystem* cpuset = NULL;
146 CgroupSubsystem* cpu = NULL;
147 CgroupSubsystem* cpuacct = NULL;
148
149 typedef char * cptr;
150
151 PRAGMA_DIAG_PUSH
152 PRAGMA_FORMAT_NONLITERAL_IGNORED
153 template <typename T> int subsystem_file_line_contents(CgroupSubsystem* c,
154 const char *filename,
155 const char *matchline,
156 const char *scan_fmt,
157 T returnval) {
158 FILE *fp = NULL;
159 char *p;
160 char file[MAXPATHLEN+1];
161 char buf[MAXPATHLEN+1];
162 char discard[MAXPATHLEN+1];
163 bool found_match = false;
164
165 if (c == NULL) {
166 log_debug(os, container)("subsystem_file_line_contents: CgroupSubsytem* is NULL");
167 return OSCONTAINER_ERROR;
168 }
169 if (c->subsystem_path() == NULL) {
170 log_debug(os, container)("subsystem_file_line_contents: subsystem path is NULL");
171 return OSCONTAINER_ERROR;
172 }
173
174 strncpy(file, c->subsystem_path(), MAXPATHLEN);
175 file[MAXPATHLEN-1] = '\0';
176 int filelen = strlen(file);
177 if ((filelen + strlen(filename)) > (MAXPATHLEN-1)) {
178 log_debug(os, container)("File path too long %s, %s", file, filename);
179 return OSCONTAINER_ERROR;
180 }
181 strncat(file, filename, MAXPATHLEN-filelen);
182 log_trace(os, container)("Path to %s is %s", filename, file);
183 fp = fopen(file, "r");
184 if (fp != NULL) {
185 int err = 0;
186 while ((p = fgets(buf, MAXPATHLEN, fp)) != NULL) {
187 found_match = false;
188 if (matchline == NULL) {
189 // single-line file case
190 int matched = sscanf(p, scan_fmt, returnval);
191 found_match = (matched == 1);
192 } else {
193 // multi-line file case
194 if (strstr(p, matchline) != NULL) {
195 // discard matchline string prefix
196 int matched = sscanf(p, scan_fmt, discard, returnval);
197 found_match = (matched == 2);
198 } else {
199 continue; // substring not found
200 }
201 }
202 if (found_match) {
203 fclose(fp);
204 return 0;
205 } else {
206 err = 1;
207 log_debug(os, container)("Type %s not found in file %s", scan_fmt, file);
208 }
209 }
210 if (err == 0) {
211 log_debug(os, container)("Empty file %s", file);
212 }
213 } else {
214 log_debug(os, container)("Open of file %s failed, %s", file, os::strerror(errno));
215 }
216 if (fp != NULL)
217 fclose(fp);
218 return OSCONTAINER_ERROR;
219 }
220 PRAGMA_DIAG_POP
221
222 #define GET_CONTAINER_INFO(return_type, subsystem, filename, \
223 logstring, scan_fmt, variable) \
224 return_type variable; \
225 { \
226 int err; \
227 err = subsystem_file_line_contents(subsystem, \
228 filename, \
229 NULL, \
230 scan_fmt, \
231 &variable); \
232 if (err != 0) \
233 return (return_type) OSCONTAINER_ERROR; \
234 \
235 log_trace(os, container)(logstring, variable); \
236 }
237
238 #define GET_CONTAINER_INFO_CPTR(return_type, subsystem, filename, \
239 logstring, scan_fmt, variable, bufsize) \
240 char variable[bufsize]; \
241 { \
242 int err; \
243 err = subsystem_file_line_contents(subsystem, \
244 filename, \
245 NULL, \
246 scan_fmt, \
247 variable); \
248 if (err != 0) \
249 return (return_type) NULL; \
250 \
251 log_trace(os, container)(logstring, variable); \
252 }
253
254 #define GET_CONTAINER_INFO_LINE(return_type, subsystem, filename, \
255 matchline, logstring, scan_fmt, variable) \
256 return_type variable; \
257 { \
258 int err; \
259 err = subsystem_file_line_contents(subsystem, \
260 filename, \
261 matchline, \
262 scan_fmt, \
263 &variable); \
264 if (err != 0) \
265 return (return_type) OSCONTAINER_ERROR; \
266 \
267 log_trace(os, container)(logstring, variable); \
268 }
269
270 /* init
271 *
272 * Initialize the container support and determine if
273 * we are running under cgroup control.
274 */
275 void OSContainer::init() {
276 FILE *mntinfo = NULL;
277 FILE *cgroup = NULL;
278 char buf[MAXPATHLEN+1];
279 char tmproot[MAXPATHLEN+1];
280 char tmpmount[MAXPATHLEN+1];
281 char *p;
282 jlong mem_limit;
283
284 assert(!_is_initialized, "Initializing OSContainer more than once");
285
286 _is_initialized = true;
287 _is_containerized = false;
288
289 _unlimited_memory = (LONG_MAX / os::vm_page_size()) * os::vm_page_size();
290
291 log_trace(os, container)("OSContainer::init: Initializing Container Support");
292 if (!UseContainerSupport) {
293 log_trace(os, container)("Container Support not enabled");
294 return;
295 }
296
297 /*
298 * Find the cgroup mount point for memory and cpuset
299 * by reading /proc/self/mountinfo
300 *
301 * Example for docker:
302 * 219 214 0:29 /docker/7208cebd00fa5f2e342b1094f7bed87fa25661471a4637118e65f1c995be8a34 /sys/fs/cgroup/memory ro,nosuid,nodev,noexec,relatime - cgroup cgroup rw,memory
303 *
304 * Example for host:
305 * 34 28 0:29 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,memory
306 */
307 mntinfo = fopen("/proc/self/mountinfo", "r");
308 if (mntinfo == NULL) {
309 log_debug(os, container)("Can't open /proc/self/mountinfo, %s",
310 os::strerror(errno));
311 return;
312 }
313
314 while ((p = fgets(buf, MAXPATHLEN, mntinfo)) != NULL) {
315 char tmpcgroups[MAXPATHLEN+1];
316 char *cptr = tmpcgroups;
317 char *token;
318
319 // mountinfo format is documented at https://www.kernel.org/doc/Documentation/filesystems/proc.txt
320 if (sscanf(p, "%*d %*d %*d:%*d %s %s %*[^-]- cgroup %*s %s", tmproot, tmpmount, tmpcgroups) != 3) {
321 continue;
322 }
323 while ((token = strsep(&cptr, ",")) != NULL) {
324 if (strcmp(token, "memory") == 0) {
325 memory = new CgroupMemorySubsystem(tmproot, tmpmount);
326 } else if (strcmp(token, "cpuset") == 0) {
327 cpuset = new CgroupSubsystem(tmproot, tmpmount);
328 } else if (strcmp(token, "cpu") == 0) {
329 cpu = new CgroupSubsystem(tmproot, tmpmount);
330 } else if (strcmp(token, "cpuacct") == 0) {
331 cpuacct= new CgroupSubsystem(tmproot, tmpmount);
332 }
333 }
334 }
335
336 fclose(mntinfo);
337
338 if (memory == NULL) {
339 log_debug(os, container)("Required cgroup memory subsystem not found");
340 return;
341 }
342 if (cpuset == NULL) {
343 log_debug(os, container)("Required cgroup cpuset subsystem not found");
344 return;
345 }
346 if (cpu == NULL) {
347 log_debug(os, container)("Required cgroup cpu subsystem not found");
348 return;
349 }
350 if (cpuacct == NULL) {
351 log_debug(os, container)("Required cgroup cpuacct subsystem not found");
352 return;
353 }
354
355 /*
356 * Read /proc/self/cgroup and map host mount point to
357 * local one via /proc/self/mountinfo content above
358 *
359 * Docker example:
360 * 5:memory:/docker/6558aed8fc662b194323ceab5b964f69cf36b3e8af877a14b80256e93aecb044
361 *
362 * Host example:
363 * 5:memory:/user.slice
364 *
365 * Construct a path to the process specific memory and cpuset
366 * cgroup directory.
367 *
368 * For a container running under Docker from memory example above
369 * the paths would be:
370 *
371 * /sys/fs/cgroup/memory
372 *
373 * For a Host from memory example above the path would be:
374 *
375 * /sys/fs/cgroup/memory/user.slice
376 *
377 */
378 cgroup = fopen("/proc/self/cgroup", "r");
379 if (cgroup == NULL) {
380 log_debug(os, container)("Can't open /proc/self/cgroup, %s",
381 os::strerror(errno));
382 return;
383 }
384
385 while ((p = fgets(buf, MAXPATHLEN, cgroup)) != NULL) {
386 char *controllers;
387 char *token;
388 char *base;
389
390 /* Skip cgroup number */
391 strsep(&p, ":");
392 /* Get controllers and base */
393 controllers = strsep(&p, ":");
394 base = strsep(&p, "\n");
395
396 if (controllers == NULL) {
397 continue;
398 }
399
400 while ((token = strsep(&controllers, ",")) != NULL) {
401 if (strcmp(token, "memory") == 0) {
402 memory->set_subsystem_path(base);
403 jlong hierarchy = uses_mem_hierarchy();
404 if (hierarchy > 0) {
405 memory->set_hierarchical(true);
406 }
407 } else if (strcmp(token, "cpuset") == 0) {
408 cpuset->set_subsystem_path(base);
409 } else if (strcmp(token, "cpu") == 0) {
410 cpu->set_subsystem_path(base);
411 } else if (strcmp(token, "cpuacct") == 0) {
412 cpuacct->set_subsystem_path(base);
413 }
414 }
415 }
416
417 fclose(cgroup);
418
419 // We need to update the amount of physical memory now that
420 // command line arguments have been processed.
421 if ((mem_limit = memory_limit_in_bytes()) > 0) {
422 os::Linux::set_physical_memory(mem_limit);
423 log_info(os, container)("Memory Limit is: " JLONG_FORMAT, mem_limit);
424 }
425
426 _is_containerized = true;
427
428 }
429
430 const char * OSContainer::container_type() {
431 if (is_containerized()) {
432 return "cgroupv1";
433 } else {
434 return NULL;
435 }
436 }
437
438 /* uses_mem_hierarchy
439 *
440 * Return whether or not hierarchical cgroup accounting is being
441 * done.
442 *
443 * return:
444 * A number > 0 if true, or
445 * OSCONTAINER_ERROR for not supported
446 */
447 jlong OSContainer::uses_mem_hierarchy() {
448 GET_CONTAINER_INFO(jlong, memory, "/memory.use_hierarchy",
449 "Use Hierarchy is: " JLONG_FORMAT, JLONG_FORMAT, use_hierarchy);
450 return use_hierarchy;
451 }
452
453
454 /* memory_limit_in_bytes
455 *
456 * Return the limit of available memory for this process.
457 *
458 * return:
459 * memory limit in bytes or
460 * -1 for unlimited
461 * OSCONTAINER_ERROR for not supported
462 */
463 jlong OSContainer::memory_limit_in_bytes() {
464 GET_CONTAINER_INFO(julong, memory, "/memory.limit_in_bytes",
465 "Memory Limit is: " JULONG_FORMAT, JULONG_FORMAT, memlimit);
466
467 if (memlimit >= _unlimited_memory) {
468 log_trace(os, container)("Non-Hierarchical Memory Limit is: Unlimited");
469 if (memory->is_hierarchical()) {
470 const char* matchline = "hierarchical_memory_limit";
471 const char* format = "%s " JULONG_FORMAT;
472 GET_CONTAINER_INFO_LINE(julong, memory, "/memory.stat", matchline,
473 "Hierarchical Memory Limit is: " JULONG_FORMAT, format, hier_memlimit)
474 if (hier_memlimit >= _unlimited_memory) {
475 log_trace(os, container)("Hierarchical Memory Limit is: Unlimited");
476 } else {
477 return (jlong)hier_memlimit;
478 }
479 }
480 return (jlong)-1;
481 }
482 else {
483 return (jlong)memlimit;
484 }
485 }
486
487 jlong OSContainer::memory_and_swap_limit_in_bytes() {
488 GET_CONTAINER_INFO(julong, memory, "/memory.memsw.limit_in_bytes",
489 "Memory and Swap Limit is: " JULONG_FORMAT, JULONG_FORMAT, memswlimit);
490 if (memswlimit >= _unlimited_memory) {
491 log_trace(os, container)("Non-Hierarchical Memory and Swap Limit is: Unlimited");
492 if (memory->is_hierarchical()) {
493 const char* matchline = "hierarchical_memsw_limit";
494 const char* format = "%s " JULONG_FORMAT;
495 GET_CONTAINER_INFO_LINE(julong, memory, "/memory.stat", matchline,
496 "Hierarchical Memory and Swap Limit is : " JULONG_FORMAT, format, hier_memlimit)
497 if (hier_memlimit >= _unlimited_memory) {
498 log_trace(os, container)("Hierarchical Memory and Swap Limit is: Unlimited");
499 } else {
500 return (jlong)hier_memlimit;
501 }
502 }
503 return (jlong)-1;
504 } else {
505 return (jlong)memswlimit;
506 }
507 }
508
509 jlong OSContainer::memory_soft_limit_in_bytes() {
510 GET_CONTAINER_INFO(julong, memory, "/memory.soft_limit_in_bytes",
511 "Memory Soft Limit is: " JULONG_FORMAT, JULONG_FORMAT, memsoftlimit);
512 if (memsoftlimit >= _unlimited_memory) {
513 log_trace(os, container)("Memory Soft Limit is: Unlimited");
514 return (jlong)-1;
515 } else {
516 return (jlong)memsoftlimit;
517 }
518 }
519
520 /* memory_usage_in_bytes
521 *
522 * Return the amount of used memory for this process.
523 *
524 * return:
525 * memory usage in bytes or
526 * -1 for unlimited
527 * OSCONTAINER_ERROR for not supported
528 */
529 jlong OSContainer::memory_usage_in_bytes() {
530 GET_CONTAINER_INFO(jlong, memory, "/memory.usage_in_bytes",
531 "Memory Usage is: " JLONG_FORMAT, JLONG_FORMAT, memusage);
532 return memusage;
533 }
534
535 /* memory_max_usage_in_bytes
536 *
537 * Return the maximum amount of used memory for this process.
538 *
539 * return:
540 * max memory usage in bytes or
541 * OSCONTAINER_ERROR for not supported
542 */
543 jlong OSContainer::memory_max_usage_in_bytes() {
544 GET_CONTAINER_INFO(jlong, memory, "/memory.max_usage_in_bytes",
545 "Maximum Memory Usage is: " JLONG_FORMAT, JLONG_FORMAT, memmaxusage);
546 return memmaxusage;
547 }
548
549 /* active_processor_count
550 *
551 * Calculate an appropriate number of active processors for the
552 * VM to use based on these three inputs.
553 *
554 * cpu affinity
555 * cgroup cpu quota & cpu period
556 * cgroup cpu shares
557 *
558 * Algorithm:
559 *
560 * Determine the number of available CPUs from sched_getaffinity
561 *
562 * If user specified a quota (quota != -1), calculate the number of
563 * required CPUs by dividing quota by period.
564 *
565 * If shares are in effect (shares != -1), calculate the number
566 * of CPUs required for the shares by dividing the share value
567 * by PER_CPU_SHARES.
568 *
569 * All results of division are rounded up to the next whole number.
570 *
571 * If neither shares or quotas have been specified, return the
572 * number of active processors in the system.
573 *
574 * If both shares and quotas have been specified, the results are
575 * based on the flag PreferContainerQuotaForCPUCount. If true,
576 * return the quota value. If false return the smallest value
577 * between shares or quotas.
578 *
579 * If shares and/or quotas have been specified, the resulting number
580 * returned will never exceed the number of active processors.
581 *
582 * return:
583 * number of CPUs
584 */
585 int OSContainer::active_processor_count() {
586 int quota_count = 0, share_count = 0;
587 int cpu_count, limit_count;
588 int result;
589
590 cpu_count = limit_count = os::Linux::active_processor_count();
591 int quota = cpu_quota();
592 int period = cpu_period();
593 int share = cpu_shares();
594
595 if (quota > -1 && period > 0) {
596 quota_count = ceilf((float)quota / (float)period);
597 log_trace(os, container)("CPU Quota count based on quota/period: %d", quota_count);
598 }
599 if (share > -1) {
600 share_count = ceilf((float)share / (float)PER_CPU_SHARES);
601 log_trace(os, container)("CPU Share count based on shares: %d", share_count);
602 }
603
604 // If both shares and quotas are setup results depend
605 // on flag PreferContainerQuotaForCPUCount.
606 // If true, limit CPU count to quota
607 // If false, use minimum of shares and quotas
608 if (quota_count !=0 && share_count != 0) {
609 if (PreferContainerQuotaForCPUCount) {
610 limit_count = quota_count;
611 } else {
612 limit_count = MIN2(quota_count, share_count);
613 }
614 } else if (quota_count != 0) {
615 limit_count = quota_count;
616 } else if (share_count != 0) {
617 limit_count = share_count;
618 }
619
620 result = MIN2(cpu_count, limit_count);
621 log_trace(os, container)("OSContainer::active_processor_count: %d", result);
622 return result;
623 }
624
625 char * OSContainer::cpu_cpuset_cpus() {
626 GET_CONTAINER_INFO_CPTR(cptr, cpuset, "/cpuset.cpus",
627 "cpuset.cpus is: %s", "%1023s", cpus, 1024);
628 return os::strdup(cpus);
629 }
630
631 char * OSContainer::cpu_cpuset_memory_nodes() {
632 GET_CONTAINER_INFO_CPTR(cptr, cpuset, "/cpuset.mems",
633 "cpuset.mems is: %s", "%1023s", mems, 1024);
634 return os::strdup(mems);
635 }
636
637 /* cpu_quota
638 *
639 * Return the number of milliseconds per period
640 * process is guaranteed to run.
641 *
642 * return:
643 * quota time in milliseconds
644 * -1 for no quota
645 * OSCONTAINER_ERROR for not supported
646 */
647 int OSContainer::cpu_quota() {
648 GET_CONTAINER_INFO(int, cpu, "/cpu.cfs_quota_us",
649 "CPU Quota is: %d", "%d", quota);
650 return quota;
651 }
652
653 int OSContainer::cpu_period() {
654 GET_CONTAINER_INFO(int, cpu, "/cpu.cfs_period_us",
655 "CPU Period is: %d", "%d", period);
656 return period;
657 }
658
659 /* cpu_shares
660 *
661 * Return the amount of cpu shares available to the process
662 *
663 * return:
664 * Share number (typically a number relative to 1024)
665 * (2048 typically expresses 2 CPUs worth of processing)
666 * -1 for no share setup
667 * OSCONTAINER_ERROR for not supported
668 */
669 int OSContainer::cpu_shares() {
670 GET_CONTAINER_INFO(int, cpu, "/cpu.shares",
671 "CPU Shares is: %d", "%d", shares);
672 // Convert 1024 to no shares setup
673 if (shares == 1024) return -1;
674
675 return shares;
676 }
|
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 <string.h>
26 #include <math.h>
27 #include <errno.h>
28 #include "runtime/globals.hpp"
29 #include "runtime/os.hpp"
30 #include "logging/log.hpp"
31 #include "osContainer_linux.hpp"
32 #include "cgroupSubsystem_linux.hpp"
33
34
35 bool OSContainer::_is_initialized = false;
36 bool OSContainer::_is_containerized = false;
37 CgroupSubsystem* cgroup_subsystem;
38
39 /* init
40 *
41 * Initialize the container support and determine if
42 * we are running under cgroup control.
43 */
44 void OSContainer::init() {
45 jlong mem_limit;
46
47 assert(!_is_initialized, "Initializing OSContainer more than once");
48
49 _is_initialized = true;
50 _is_containerized = false;
51
52 log_trace(os, container)("OSContainer::init: Initializing Container Support");
53 if (!UseContainerSupport) {
54 log_trace(os, container)("Container Support not enabled");
55 return;
56 }
57
58 cgroup_subsystem = CgroupSubsystemFactory::create();
59 if (cgroup_subsystem == NULL) {
60 return; // Required subsystem files not found or other error
61 }
62 // We need to update the amount of physical memory now that
63 // cgroup subsystem files have been processed.
64 if ((mem_limit = cgroup_subsystem->memory_limit_in_bytes()) > 0) {
65 os::Linux::set_physical_memory(mem_limit);
66 log_info(os, container)("Memory Limit is: " JLONG_FORMAT, mem_limit);
67 }
68
69 _is_containerized = true;
70
71 }
72
73 const char * OSContainer::container_type() {
74 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
75 return cgroup_subsystem->container_type();
76 }
77
78 jlong OSContainer::memory_limit_in_bytes() {
79 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
80 return cgroup_subsystem->memory_limit_in_bytes();
81 }
82
83 jlong OSContainer::memory_and_swap_limit_in_bytes() {
84 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
85 return cgroup_subsystem->memory_and_swap_limit_in_bytes();
86 }
87
88 jlong OSContainer::memory_soft_limit_in_bytes() {
89 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
90 return cgroup_subsystem->memory_soft_limit_in_bytes();
91 }
92
93 jlong OSContainer::memory_usage_in_bytes() {
94 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
95 return cgroup_subsystem->memory_usage_in_bytes();
96 }
97
98 jlong OSContainer::memory_max_usage_in_bytes() {
99 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
100 return cgroup_subsystem->memory_max_usage_in_bytes();
101 }
102
103 char * OSContainer::cpu_cpuset_cpus() {
104 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
105 return cgroup_subsystem->cpu_cpuset_cpus();
106 }
107
108 char * OSContainer::cpu_cpuset_memory_nodes() {
109 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
110 return cgroup_subsystem->cpu_cpuset_memory_nodes();
111 }
112
113 int OSContainer::active_processor_count() {
114 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
115 int physical_proc = os::Linux::active_processor_count();
116 return cgroup_subsystem->active_processor_count(physical_proc);
117 }
118
119 int OSContainer::cpu_quota() {
120 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
121 return cgroup_subsystem->cpu_quota();
122 }
123
124 int OSContainer::cpu_period() {
125 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
126 return cgroup_subsystem->cpu_period();
127 }
128
129 int OSContainer::cpu_shares() {
130 assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
131 return cgroup_subsystem->cpu_shares();
132 }
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