1 /*
2 * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
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 <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 int OSContainer::_active_processor_count = 1;
58 julong _unlimited_memory;
59
60 class CgroupSubsystem: CHeapObj<mtInternal> {
61 friend class OSContainer;
62
63
64 private:
65 volatile jlong _next_check_counter;
66
67 /* mountinfo contents */
68 char *_root;
69 char *_mount_point;
70
71 /* Constructed subsystem directory */
72 char *_path;
73
74 public:
75 CgroupSubsystem(char *root, char *mountpoint) {
76 _root = os::strdup(root);
77 _mount_point = os::strdup(mountpoint);
78 _path = NULL;
79 _next_check_counter = min_jlong;
80 }
81
82 /*
83 * Set directory to subsystem specific files based
84 * on the contents of the mountinfo and cgroup files.
85 */
86 void set_subsystem_path(char *cgroup_path) {
87 char buf[MAXPATHLEN+1];
88 if (_root != NULL && cgroup_path != NULL) {
89 if (strcmp(_root, "/") == 0) {
90 int buflen;
91 strncpy(buf, _mount_point, MAXPATHLEN);
92 buf[MAXPATHLEN-1] = '\0';
93 if (strcmp(cgroup_path,"/") != 0) {
94 buflen = strlen(buf);
95 if ((buflen + strlen(cgroup_path)) > (MAXPATHLEN-1)) {
96 return;
97 }
98 strncat(buf, cgroup_path, MAXPATHLEN-buflen);
99 buf[MAXPATHLEN-1] = '\0';
100 }
101 _path = os::strdup(buf);
102 } else {
103 if (strcmp(_root, cgroup_path) == 0) {
104 strncpy(buf, _mount_point, MAXPATHLEN);
105 buf[MAXPATHLEN-1] = '\0';
106 _path = os::strdup(buf);
107 } else {
108 char *p = strstr(cgroup_path, _root);
109 if (p != NULL && p == _root) {
110 if (strlen(cgroup_path) > strlen(_root)) {
111 int buflen;
112 strncpy(buf, _mount_point, MAXPATHLEN);
113 buf[MAXPATHLEN-1] = '\0';
114 buflen = strlen(buf);
115 if ((buflen + strlen(cgroup_path) - strlen(_root)) > (MAXPATHLEN-1)) {
116 return;
117 }
118 strncat(buf, cgroup_path + strlen(_root), MAXPATHLEN-buflen);
119 buf[MAXPATHLEN-1] = '\0';
120 _path = os::strdup(buf);
121 }
122 }
123 }
124 }
125 }
126 }
127
128 char *subsystem_path() { return _path; }
129
130 bool cache_has_expired() {
131 return os::elapsed_counter() > _next_check_counter;
132 }
133
134 void set_cache_expiry_time(jlong timeout) {
135 _next_check_counter = os::elapsed_counter() + timeout;
136 }
137 };
138
139 class CgroupMemorySubsystem: CgroupSubsystem {
140 friend class OSContainer;
141
142 private:
143 /* Some container runtimes set limits via cgroup
144 * hierarchy. If set to true consider also memory.stat
145 * file if everything else seems unlimited */
146 bool _uses_mem_hierarchy;
147 volatile jlong _memory_limit_in_bytes;
148
149 public:
150 CgroupMemorySubsystem(char *root, char *mountpoint) : CgroupSubsystem::CgroupSubsystem(root, mountpoint) {
151 _uses_mem_hierarchy = false;
152 _memory_limit_in_bytes = -1;
153
154 }
155
156 bool is_hierarchical() { return _uses_mem_hierarchy; }
157 void set_hierarchical(bool value) { _uses_mem_hierarchy = value; }
158
159 jlong memory_limit_in_bytes() { return _memory_limit_in_bytes; }
160 void set_memory_limit_in_bytes(jlong value) {
161 _memory_limit_in_bytes = value;
162 // max memory limit is unlikely to change, but we want to remain
163 // responsive to configuration changes. A very short grace time
164 // between re-read avoids excessive overhead during startup without
165 // significantly reducing the VMs ability to promptly react to reduced
166 // memory availability
167 set_cache_expiry_time(OSCONTAINER_CACHE_TIMEOUT);
168 }
169
170 };
171
172 CgroupMemorySubsystem* memory = NULL;
173 CgroupSubsystem* cpuset = NULL;
174 CgroupSubsystem* cpu = NULL;
175 CgroupSubsystem* cpuacct = NULL;
176
177 typedef char * cptr;
178
179 PRAGMA_DIAG_PUSH
180 PRAGMA_FORMAT_NONLITERAL_IGNORED
181 template <typename T> int subsystem_file_line_contents(CgroupSubsystem* c,
182 const char *filename,
183 const char *matchline,
184 const char *scan_fmt,
185 T returnval) {
186 FILE *fp = NULL;
187 char *p;
188 char file[MAXPATHLEN+1];
189 char buf[MAXPATHLEN+1];
190 char discard[MAXPATHLEN+1];
191 bool found_match = false;
192
193 if (c == NULL) {
194 log_debug(os, container)("subsystem_file_line_contents: CgroupSubsytem* is NULL");
195 return OSCONTAINER_ERROR;
196 }
197 if (c->subsystem_path() == NULL) {
198 log_debug(os, container)("subsystem_file_line_contents: subsystem path is NULL");
199 return OSCONTAINER_ERROR;
200 }
201
202 strncpy(file, c->subsystem_path(), MAXPATHLEN);
203 file[MAXPATHLEN-1] = '\0';
204 int filelen = strlen(file);
205 if ((filelen + strlen(filename)) > (MAXPATHLEN-1)) {
206 log_debug(os, container)("File path too long %s, %s", file, filename);
207 return OSCONTAINER_ERROR;
208 }
209 strncat(file, filename, MAXPATHLEN-filelen);
210 log_trace(os, container)("Path to %s is %s", filename, file);
211 fp = fopen(file, "r");
212 if (fp != NULL) {
213 int err = 0;
214 while ((p = fgets(buf, MAXPATHLEN, fp)) != NULL) {
215 found_match = false;
216 if (matchline == NULL) {
217 // single-line file case
218 int matched = sscanf(p, scan_fmt, returnval);
219 found_match = (matched == 1);
220 } else {
221 // multi-line file case
222 if (strstr(p, matchline) != NULL) {
223 // discard matchline string prefix
224 int matched = sscanf(p, scan_fmt, discard, returnval);
225 found_match = (matched == 2);
226 } else {
227 continue; // substring not found
228 }
229 }
230 if (found_match) {
231 fclose(fp);
232 return 0;
233 } else {
234 err = 1;
235 log_debug(os, container)("Type %s not found in file %s", scan_fmt, file);
236 }
237 }
238 if (err == 0) {
239 log_debug(os, container)("Empty file %s", file);
240 }
241 } else {
242 log_debug(os, container)("Open of file %s failed, %s", file, os::strerror(errno));
243 }
244 if (fp != NULL)
245 fclose(fp);
246 return OSCONTAINER_ERROR;
247 }
248 PRAGMA_DIAG_POP
249
250 #define GET_CONTAINER_INFO(return_type, subsystem, filename, \
251 logstring, scan_fmt, variable) \
252 return_type variable; \
253 { \
254 int err; \
255 err = subsystem_file_line_contents(subsystem, \
256 filename, \
257 NULL, \
258 scan_fmt, \
259 &variable); \
260 if (err != 0) \
261 return (return_type) OSCONTAINER_ERROR; \
262 \
263 log_trace(os, container)(logstring, variable); \
264 }
265
266 #define GET_CONTAINER_INFO_CPTR(return_type, subsystem, filename, \
267 logstring, scan_fmt, variable, bufsize) \
268 char variable[bufsize]; \
269 { \
270 int err; \
271 err = subsystem_file_line_contents(subsystem, \
272 filename, \
273 NULL, \
274 scan_fmt, \
275 variable); \
276 if (err != 0) \
277 return (return_type) NULL; \
278 \
279 log_trace(os, container)(logstring, variable); \
280 }
281
282 #define GET_CONTAINER_INFO_LINE(return_type, subsystem, filename, \
283 matchline, logstring, scan_fmt, variable) \
284 return_type variable; \
285 { \
286 int err; \
287 err = subsystem_file_line_contents(subsystem, \
288 filename, \
289 matchline, \
290 scan_fmt, \
291 &variable); \
292 if (err != 0) \
293 return (return_type) OSCONTAINER_ERROR; \
294 \
295 log_trace(os, container)(logstring, variable); \
296 }
297
298 /* init
299 *
300 * Initialize the container support and determine if
301 * we are running under cgroup control.
302 */
303 void OSContainer::init() {
304 FILE *mntinfo = NULL;
305 FILE *cgroup = NULL;
306 char buf[MAXPATHLEN+1];
307 char tmproot[MAXPATHLEN+1];
308 char tmpmount[MAXPATHLEN+1];
309 char *p;
310 jlong mem_limit;
311
312 assert(!_is_initialized, "Initializing OSContainer more than once");
313
314 _is_initialized = true;
315 _is_containerized = false;
316
317 _unlimited_memory = (LONG_MAX / os::vm_page_size()) * os::vm_page_size();
318
319 log_trace(os, container)("OSContainer::init: Initializing Container Support");
320 if (!UseContainerSupport) {
321 log_trace(os, container)("Container Support not enabled");
322 return;
323 }
324
325 /*
326 * Find the cgroup mount point for memory and cpuset
327 * by reading /proc/self/mountinfo
328 *
329 * Example for docker:
330 * 219 214 0:29 /docker/7208cebd00fa5f2e342b1094f7bed87fa25661471a4637118e65f1c995be8a34 /sys/fs/cgroup/memory ro,nosuid,nodev,noexec,relatime - cgroup cgroup rw,memory
331 *
332 * Example for host:
333 * 34 28 0:29 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,memory
334 */
335 mntinfo = fopen("/proc/self/mountinfo", "r");
336 if (mntinfo == NULL) {
337 log_debug(os, container)("Can't open /proc/self/mountinfo, %s",
338 os::strerror(errno));
339 return;
340 }
341
342 while ((p = fgets(buf, MAXPATHLEN, mntinfo)) != NULL) {
343 char tmpcgroups[MAXPATHLEN+1];
344 char *cptr = tmpcgroups;
345 char *token;
346
347 // mountinfo format is documented at https://www.kernel.org/doc/Documentation/filesystems/proc.txt
348 if (sscanf(p, "%*d %*d %*d:%*d %s %s %*[^-]- cgroup %*s %s", tmproot, tmpmount, tmpcgroups) != 3) {
349 continue;
350 }
351 while ((token = strsep(&cptr, ",")) != NULL) {
352 if (strcmp(token, "memory") == 0) {
353 memory = new CgroupMemorySubsystem(tmproot, tmpmount);
354 } else if (strcmp(token, "cpuset") == 0) {
355 cpuset = new CgroupSubsystem(tmproot, tmpmount);
356 } else if (strcmp(token, "cpu") == 0) {
357 cpu = new CgroupSubsystem(tmproot, tmpmount);
358 } else if (strcmp(token, "cpuacct") == 0) {
359 cpuacct= new CgroupSubsystem(tmproot, tmpmount);
360 }
361 }
362 }
363
364 fclose(mntinfo);
365
366 if (memory == NULL) {
367 log_debug(os, container)("Required cgroup memory subsystem not found");
368 return;
369 }
370 if (cpuset == NULL) {
371 log_debug(os, container)("Required cgroup cpuset subsystem not found");
372 return;
373 }
374 if (cpu == NULL) {
375 log_debug(os, container)("Required cgroup cpu subsystem not found");
376 return;
377 }
378 if (cpuacct == NULL) {
379 log_debug(os, container)("Required cgroup cpuacct subsystem not found");
380 return;
381 }
382
383 /*
384 * Read /proc/self/cgroup and map host mount point to
385 * local one via /proc/self/mountinfo content above
386 *
387 * Docker example:
388 * 5:memory:/docker/6558aed8fc662b194323ceab5b964f69cf36b3e8af877a14b80256e93aecb044
389 *
390 * Host example:
391 * 5:memory:/user.slice
392 *
393 * Construct a path to the process specific memory and cpuset
394 * cgroup directory.
395 *
396 * For a container running under Docker from memory example above
397 * the paths would be:
398 *
399 * /sys/fs/cgroup/memory
400 *
401 * For a Host from memory example above the path would be:
402 *
403 * /sys/fs/cgroup/memory/user.slice
404 *
405 */
406 cgroup = fopen("/proc/self/cgroup", "r");
407 if (cgroup == NULL) {
408 log_debug(os, container)("Can't open /proc/self/cgroup, %s",
409 os::strerror(errno));
410 return;
411 }
412
413 while ((p = fgets(buf, MAXPATHLEN, cgroup)) != NULL) {
414 char *controllers;
415 char *token;
416 char *base;
417
418 /* Skip cgroup number */
419 strsep(&p, ":");
420 /* Get controllers and base */
421 controllers = strsep(&p, ":");
422 base = strsep(&p, "\n");
423
424 if (controllers == NULL) {
425 continue;
426 }
427
428 while ((token = strsep(&controllers, ",")) != NULL) {
429 if (strcmp(token, "memory") == 0) {
430 memory->set_subsystem_path(base);
431 jlong hierarchy = uses_mem_hierarchy();
432 if (hierarchy > 0) {
433 memory->set_hierarchical(true);
434 }
435 } else if (strcmp(token, "cpuset") == 0) {
436 cpuset->set_subsystem_path(base);
437 } else if (strcmp(token, "cpu") == 0) {
438 cpu->set_subsystem_path(base);
439 } else if (strcmp(token, "cpuacct") == 0) {
440 cpuacct->set_subsystem_path(base);
441 }
442 }
443 }
444
445 fclose(cgroup);
446
447 // We need to update the amount of physical memory now that
448 // command line arguments have been processed.
449 if ((mem_limit = memory_limit_in_bytes()) > 0) {
450 os::Linux::set_physical_memory(mem_limit);
451 log_info(os, container)("Memory Limit is: " JLONG_FORMAT, mem_limit);
452 }
453
454 _is_containerized = true;
455
456 }
457
458 const char * OSContainer::container_type() {
459 if (is_containerized()) {
460 return "cgroupv1";
461 } else {
462 return NULL;
463 }
464 }
465
466 /* uses_mem_hierarchy
467 *
468 * Return whether or not hierarchical cgroup accounting is being
469 * done.
470 *
471 * return:
472 * A number > 0 if true, or
473 * OSCONTAINER_ERROR for not supported
474 */
475 jlong OSContainer::uses_mem_hierarchy() {
476 GET_CONTAINER_INFO(jlong, memory, "/memory.use_hierarchy",
477 "Use Hierarchy is: " JLONG_FORMAT, JLONG_FORMAT, use_hierarchy);
478 return use_hierarchy;
479 }
480
481
482 /* memory_limit_in_bytes
483 *
484 * Return the limit of available memory for this process.
485 *
486 * return:
487 * memory limit in bytes or
488 * -1 for unlimited
489 * OSCONTAINER_ERROR for not supported
490 */
491 jlong OSContainer::memory_limit_in_bytes() {
492 if (!memory->cache_has_expired()) {
493 return memory->memory_limit_in_bytes();
494 }
495 jlong memory_limit = read_memory_limit_in_bytes();
496 // Update CgroupMemorySubsystem to avoid re-reading container settings too often
497 memory->set_memory_limit_in_bytes(memory_limit);
498 return memory_limit;
499 }
500
501 jlong OSContainer::read_memory_limit_in_bytes() {
502 GET_CONTAINER_INFO(julong, memory, "/memory.limit_in_bytes",
503 "Memory Limit is: " JULONG_FORMAT, JULONG_FORMAT, memlimit);
504
505 if (memlimit >= _unlimited_memory) {
506 log_trace(os, container)("Non-Hierarchical Memory Limit is: Unlimited");
507 if (memory->is_hierarchical()) {
508 const char* matchline = "hierarchical_memory_limit";
509 const char* format = "%s " JULONG_FORMAT;
510 GET_CONTAINER_INFO_LINE(julong, memory, "/memory.stat", matchline,
511 "Hierarchical Memory Limit is: " JULONG_FORMAT, format, hier_memlimit)
512 if (hier_memlimit >= _unlimited_memory) {
513 log_trace(os, container)("Hierarchical Memory Limit is: Unlimited");
514 } else {
515 return (jlong)hier_memlimit;
516 }
517 }
518 return (jlong)-1;
519 }
520 else {
521 return (jlong)memlimit;
522 }
523 }
524
525 jlong OSContainer::memory_and_swap_limit_in_bytes() {
526 GET_CONTAINER_INFO(julong, memory, "/memory.memsw.limit_in_bytes",
527 "Memory and Swap Limit is: " JULONG_FORMAT, JULONG_FORMAT, memswlimit);
528 if (memswlimit >= _unlimited_memory) {
529 log_trace(os, container)("Non-Hierarchical Memory and Swap Limit is: Unlimited");
530 if (memory->is_hierarchical()) {
531 const char* matchline = "hierarchical_memsw_limit";
532 const char* format = "%s " JULONG_FORMAT;
533 GET_CONTAINER_INFO_LINE(julong, memory, "/memory.stat", matchline,
534 "Hierarchical Memory and Swap Limit is : " JULONG_FORMAT, format, hier_memlimit)
535 if (hier_memlimit >= _unlimited_memory) {
536 log_trace(os, container)("Hierarchical Memory and Swap Limit is: Unlimited");
537 } else {
538 return (jlong)hier_memlimit;
539 }
540 }
541 return (jlong)-1;
542 } else {
543 return (jlong)memswlimit;
544 }
545 }
546
547 jlong OSContainer::memory_soft_limit_in_bytes() {
548 GET_CONTAINER_INFO(julong, memory, "/memory.soft_limit_in_bytes",
549 "Memory Soft Limit is: " JULONG_FORMAT, JULONG_FORMAT, memsoftlimit);
550 if (memsoftlimit >= _unlimited_memory) {
551 log_trace(os, container)("Memory Soft Limit is: Unlimited");
552 return (jlong)-1;
553 } else {
554 return (jlong)memsoftlimit;
555 }
556 }
557
558 /* memory_usage_in_bytes
559 *
560 * Return the amount of used memory for this process.
561 *
562 * return:
563 * memory usage in bytes or
564 * -1 for unlimited
565 * OSCONTAINER_ERROR for not supported
566 */
567 jlong OSContainer::memory_usage_in_bytes() {
568 GET_CONTAINER_INFO(jlong, memory, "/memory.usage_in_bytes",
569 "Memory Usage is: " JLONG_FORMAT, JLONG_FORMAT, memusage);
570 return memusage;
571 }
572
573 /* memory_max_usage_in_bytes
574 *
575 * Return the maximum amount of used memory for this process.
576 *
577 * return:
578 * max memory usage in bytes or
579 * OSCONTAINER_ERROR for not supported
580 */
581 jlong OSContainer::memory_max_usage_in_bytes() {
582 GET_CONTAINER_INFO(jlong, memory, "/memory.max_usage_in_bytes",
583 "Maximum Memory Usage is: " JLONG_FORMAT, JLONG_FORMAT, memmaxusage);
584 return memmaxusage;
585 }
586
587 /* active_processor_count
588 *
589 * Calculate an appropriate number of active processors for the
590 * VM to use based on these three inputs.
591 *
592 * cpu affinity
593 * cgroup cpu quota & cpu period
594 * cgroup cpu shares
595 *
596 * Algorithm:
597 *
598 * Determine the number of available CPUs from sched_getaffinity
599 *
600 * If user specified a quota (quota != -1), calculate the number of
601 * required CPUs by dividing quota by period.
602 *
603 * If shares are in effect (shares != -1), calculate the number
604 * of CPUs required for the shares by dividing the share value
605 * by PER_CPU_SHARES.
606 *
607 * All results of division are rounded up to the next whole number.
608 *
609 * If neither shares or quotas have been specified, return the
610 * number of active processors in the system.
611 *
612 * If both shares and quotas have been specified, the results are
613 * based on the flag PreferContainerQuotaForCPUCount. If true,
614 * return the quota value. If false return the smallest value
615 * between shares or quotas.
616 *
617 * If shares and/or quotas have been specified, the resulting number
618 * returned will never exceed the number of active processors.
619 *
620 * return:
621 * number of CPUs
622 */
623 int OSContainer::active_processor_count() {
624 int quota_count = 0, share_count = 0;
625 int cpu_count, limit_count;
626 int result;
627
628 // We use a cache with a timeout to avoid performing expensive
629 // computations in the event this function is called frequently.
630 // [See 8227006].
631 if (!cpu->cache_has_expired()) {
632 log_trace(os, container)("OSContainer::active_processor_count (cached): %d", OSContainer::_active_processor_count);
633 return OSContainer::_active_processor_count;
634 }
635
636 cpu_count = limit_count = os::Linux::active_processor_count();
637 int quota = cpu_quota();
638 int period = cpu_period();
639 int share = cpu_shares();
640
641 if (quota > -1 && period > 0) {
642 quota_count = ceilf((float)quota / (float)period);
643 log_trace(os, container)("CPU Quota count based on quota/period: %d", quota_count);
644 }
645 if (share > -1) {
646 share_count = ceilf((float)share / (float)PER_CPU_SHARES);
647 log_trace(os, container)("CPU Share count based on shares: %d", share_count);
648 }
649
650 // If both shares and quotas are setup results depend
651 // on flag PreferContainerQuotaForCPUCount.
652 // If true, limit CPU count to quota
653 // If false, use minimum of shares and quotas
654 if (quota_count !=0 && share_count != 0) {
655 if (PreferContainerQuotaForCPUCount) {
656 limit_count = quota_count;
657 } else {
658 limit_count = MIN2(quota_count, share_count);
659 }
660 } else if (quota_count != 0) {
661 limit_count = quota_count;
662 } else if (share_count != 0) {
663 limit_count = share_count;
664 }
665
666 result = MIN2(cpu_count, limit_count);
667 log_trace(os, container)("OSContainer::active_processor_count: %d", result);
668
669 // Update the value and reset the cache timeout
670 OSContainer::_active_processor_count = result;
671 cpu->set_cache_expiry_time(OSCONTAINER_CACHE_TIMEOUT);
672
673 return result;
674 }
675
676 char * OSContainer::cpu_cpuset_cpus() {
677 GET_CONTAINER_INFO_CPTR(cptr, cpuset, "/cpuset.cpus",
678 "cpuset.cpus is: %s", "%1023s", cpus, 1024);
679 return os::strdup(cpus);
680 }
681
682 char * OSContainer::cpu_cpuset_memory_nodes() {
683 GET_CONTAINER_INFO_CPTR(cptr, cpuset, "/cpuset.mems",
684 "cpuset.mems is: %s", "%1023s", mems, 1024);
685 return os::strdup(mems);
686 }
687
688 /* cpu_quota
689 *
690 * Return the number of milliseconds per period
691 * process is guaranteed to run.
692 *
693 * return:
694 * quota time in milliseconds
695 * -1 for no quota
696 * OSCONTAINER_ERROR for not supported
697 */
698 int OSContainer::cpu_quota() {
699 GET_CONTAINER_INFO(int, cpu, "/cpu.cfs_quota_us",
700 "CPU Quota is: %d", "%d", quota);
701 return quota;
702 }
703
704 int OSContainer::cpu_period() {
705 GET_CONTAINER_INFO(int, cpu, "/cpu.cfs_period_us",
706 "CPU Period is: %d", "%d", period);
707 return period;
708 }
709
710 /* cpu_shares
711 *
712 * Return the amount of cpu shares available to the process
713 *
714 * return:
715 * Share number (typically a number relative to 1024)
716 * (2048 typically expresses 2 CPUs worth of processing)
717 * -1 for no share setup
718 * OSCONTAINER_ERROR for not supported
719 */
720 int OSContainer::cpu_shares() {
721 GET_CONTAINER_INFO(int, cpu, "/cpu.shares",
722 "CPU Shares is: %d", "%d", shares);
723 // Convert 1024 to no shares setup
724 if (shares == 1024) return -1;
725
726 return shares;
727 }