mirror of
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676 lines
23 KiB
C++
676 lines
23 KiB
C++
/*
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* Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include <string.h>
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#include <math.h>
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#include <errno.h>
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#include "utilities/globalDefinitions.hpp"
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#include "memory/allocation.hpp"
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#include "runtime/os.hpp"
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#include "logging/log.hpp"
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#include "osContainer_linux.hpp"
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/*
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* PER_CPU_SHARES has been set to 1024 because CPU shares' quota
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* is commonly used in cloud frameworks like Kubernetes[1],
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* AWS[2] and Mesos[3] in a similar way. They spawn containers with
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* --cpu-shares option values scaled by PER_CPU_SHARES. Thus, we do
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* the inverse for determining the number of possible available
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* CPUs to the JVM inside a container. See JDK-8216366.
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*
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* [1] https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/#meaning-of-cpu
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* In particular:
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* When using Docker:
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* The spec.containers[].resources.requests.cpu is converted to its core value, which is potentially
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* fractional, and multiplied by 1024. The greater of this number or 2 is used as the value of the
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* --cpu-shares flag in the docker run command.
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* [2] https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_ContainerDefinition.html
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* [3] https://github.com/apache/mesos/blob/3478e344fb77d931f6122980c6e94cd3913c441d/src/docker/docker.cpp#L648
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* https://github.com/apache/mesos/blob/3478e344fb77d931f6122980c6e94cd3913c441d/src/slave/containerizer/mesos/isolators/cgroups/constants.hpp#L30
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*/
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#define PER_CPU_SHARES 1024
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bool OSContainer::_is_initialized = false;
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bool OSContainer::_is_containerized = false;
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julong _unlimited_memory;
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class CgroupSubsystem: CHeapObj<mtInternal> {
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friend class OSContainer;
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private:
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/* mountinfo contents */
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char *_root;
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char *_mount_point;
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/* Constructed subsystem directory */
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char *_path;
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public:
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CgroupSubsystem(char *root, char *mountpoint) {
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_root = os::strdup(root);
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_mount_point = os::strdup(mountpoint);
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_path = NULL;
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}
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/*
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* Set directory to subsystem specific files based
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* on the contents of the mountinfo and cgroup files.
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*/
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void set_subsystem_path(char *cgroup_path) {
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char buf[MAXPATHLEN+1];
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if (_root != NULL && cgroup_path != NULL) {
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if (strcmp(_root, "/") == 0) {
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int buflen;
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strncpy(buf, _mount_point, MAXPATHLEN);
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buf[MAXPATHLEN-1] = '\0';
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if (strcmp(cgroup_path,"/") != 0) {
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buflen = strlen(buf);
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if ((buflen + strlen(cgroup_path)) > (MAXPATHLEN-1)) {
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return;
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}
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strncat(buf, cgroup_path, MAXPATHLEN-buflen);
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buf[MAXPATHLEN-1] = '\0';
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}
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_path = os::strdup(buf);
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} else {
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if (strcmp(_root, cgroup_path) == 0) {
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strncpy(buf, _mount_point, MAXPATHLEN);
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buf[MAXPATHLEN-1] = '\0';
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_path = os::strdup(buf);
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} else {
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char *p = strstr(cgroup_path, _root);
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if (p != NULL && p == _root) {
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if (strlen(cgroup_path) > strlen(_root)) {
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int buflen;
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strncpy(buf, _mount_point, MAXPATHLEN);
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buf[MAXPATHLEN-1] = '\0';
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buflen = strlen(buf);
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if ((buflen + strlen(cgroup_path) - strlen(_root)) > (MAXPATHLEN-1)) {
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return;
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}
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strncat(buf, cgroup_path + strlen(_root), MAXPATHLEN-buflen);
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buf[MAXPATHLEN-1] = '\0';
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_path = os::strdup(buf);
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}
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}
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}
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}
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}
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}
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char *subsystem_path() { return _path; }
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};
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class CgroupMemorySubsystem: CgroupSubsystem {
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friend class OSContainer;
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private:
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/* Some container runtimes set limits via cgroup
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* hierarchy. If set to true consider also memory.stat
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* file if everything else seems unlimited */
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bool _uses_mem_hierarchy;
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public:
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CgroupMemorySubsystem(char *root, char *mountpoint) : CgroupSubsystem::CgroupSubsystem(root, mountpoint) {
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_uses_mem_hierarchy = false;
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}
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bool is_hierarchical() { return _uses_mem_hierarchy; }
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void set_hierarchical(bool value) { _uses_mem_hierarchy = value; }
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};
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CgroupMemorySubsystem* memory = NULL;
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CgroupSubsystem* cpuset = NULL;
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CgroupSubsystem* cpu = NULL;
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CgroupSubsystem* cpuacct = NULL;
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typedef char * cptr;
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PRAGMA_DIAG_PUSH
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PRAGMA_FORMAT_NONLITERAL_IGNORED
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template <typename T> int subsystem_file_line_contents(CgroupSubsystem* c,
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const char *filename,
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const char *matchline,
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const char *scan_fmt,
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T returnval) {
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FILE *fp = NULL;
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char *p;
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char file[MAXPATHLEN+1];
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char buf[MAXPATHLEN+1];
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char discard[MAXPATHLEN+1];
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bool found_match = false;
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if (c == NULL) {
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log_debug(os, container)("subsystem_file_line_contents: CgroupSubsytem* is NULL");
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return OSCONTAINER_ERROR;
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}
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if (c->subsystem_path() == NULL) {
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log_debug(os, container)("subsystem_file_line_contents: subsystem path is NULL");
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return OSCONTAINER_ERROR;
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}
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strncpy(file, c->subsystem_path(), MAXPATHLEN);
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file[MAXPATHLEN-1] = '\0';
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int filelen = strlen(file);
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if ((filelen + strlen(filename)) > (MAXPATHLEN-1)) {
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log_debug(os, container)("File path too long %s, %s", file, filename);
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return OSCONTAINER_ERROR;
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}
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strncat(file, filename, MAXPATHLEN-filelen);
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log_trace(os, container)("Path to %s is %s", filename, file);
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fp = fopen(file, "r");
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if (fp != NULL) {
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int err = 0;
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while ((p = fgets(buf, MAXPATHLEN, fp)) != NULL) {
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found_match = false;
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if (matchline == NULL) {
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// single-line file case
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int matched = sscanf(p, scan_fmt, returnval);
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found_match = (matched == 1);
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} else {
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// multi-line file case
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if (strstr(p, matchline) != NULL) {
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// discard matchline string prefix
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int matched = sscanf(p, scan_fmt, discard, returnval);
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found_match = (matched == 2);
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} else {
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continue; // substring not found
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}
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}
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if (found_match) {
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fclose(fp);
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return 0;
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} else {
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err = 1;
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log_debug(os, container)("Type %s not found in file %s", scan_fmt, file);
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}
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}
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if (err == 0) {
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log_debug(os, container)("Empty file %s", file);
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}
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} else {
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log_debug(os, container)("Open of file %s failed, %s", file, os::strerror(errno));
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}
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if (fp != NULL)
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fclose(fp);
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return OSCONTAINER_ERROR;
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}
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PRAGMA_DIAG_POP
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#define GET_CONTAINER_INFO(return_type, subsystem, filename, \
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logstring, scan_fmt, variable) \
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return_type variable; \
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{ \
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int err; \
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err = subsystem_file_line_contents(subsystem, \
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filename, \
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NULL, \
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scan_fmt, \
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&variable); \
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if (err != 0) \
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return (return_type) OSCONTAINER_ERROR; \
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\
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log_trace(os, container)(logstring, variable); \
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}
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#define GET_CONTAINER_INFO_CPTR(return_type, subsystem, filename, \
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logstring, scan_fmt, variable, bufsize) \
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char variable[bufsize]; \
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{ \
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int err; \
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err = subsystem_file_line_contents(subsystem, \
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filename, \
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NULL, \
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scan_fmt, \
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variable); \
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if (err != 0) \
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return (return_type) NULL; \
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\
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log_trace(os, container)(logstring, variable); \
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}
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#define GET_CONTAINER_INFO_LINE(return_type, subsystem, filename, \
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matchline, logstring, scan_fmt, variable) \
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return_type variable; \
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{ \
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int err; \
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err = subsystem_file_line_contents(subsystem, \
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filename, \
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matchline, \
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scan_fmt, \
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&variable); \
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if (err != 0) \
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return (return_type) OSCONTAINER_ERROR; \
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\
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log_trace(os, container)(logstring, variable); \
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}
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/* init
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*
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* Initialize the container support and determine if
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* we are running under cgroup control.
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*/
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void OSContainer::init() {
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FILE *mntinfo = NULL;
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FILE *cgroup = NULL;
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char buf[MAXPATHLEN+1];
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char tmproot[MAXPATHLEN+1];
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char tmpmount[MAXPATHLEN+1];
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char *p;
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jlong mem_limit;
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assert(!_is_initialized, "Initializing OSContainer more than once");
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_is_initialized = true;
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_is_containerized = false;
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_unlimited_memory = (LONG_MAX / os::vm_page_size()) * os::vm_page_size();
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log_trace(os, container)("OSContainer::init: Initializing Container Support");
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if (!UseContainerSupport) {
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log_trace(os, container)("Container Support not enabled");
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return;
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}
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/*
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* Find the cgroup mount point for memory and cpuset
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* by reading /proc/self/mountinfo
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*
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* Example for docker:
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* 219 214 0:29 /docker/7208cebd00fa5f2e342b1094f7bed87fa25661471a4637118e65f1c995be8a34 /sys/fs/cgroup/memory ro,nosuid,nodev,noexec,relatime - cgroup cgroup rw,memory
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*
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* Example for host:
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* 34 28 0:29 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,memory
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*/
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mntinfo = fopen("/proc/self/mountinfo", "r");
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if (mntinfo == NULL) {
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log_debug(os, container)("Can't open /proc/self/mountinfo, %s",
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os::strerror(errno));
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return;
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}
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while ((p = fgets(buf, MAXPATHLEN, mntinfo)) != NULL) {
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char tmpcgroups[MAXPATHLEN+1];
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char *cptr = tmpcgroups;
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char *token;
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// mountinfo format is documented at https://www.kernel.org/doc/Documentation/filesystems/proc.txt
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if (sscanf(p, "%*d %*d %*d:%*d %s %s %*[^-]- cgroup %*s %s", tmproot, tmpmount, tmpcgroups) != 3) {
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continue;
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}
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while ((token = strsep(&cptr, ",")) != NULL) {
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if (strcmp(token, "memory") == 0) {
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memory = new CgroupMemorySubsystem(tmproot, tmpmount);
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} else if (strcmp(token, "cpuset") == 0) {
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cpuset = new CgroupSubsystem(tmproot, tmpmount);
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} else if (strcmp(token, "cpu") == 0) {
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cpu = new CgroupSubsystem(tmproot, tmpmount);
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} else if (strcmp(token, "cpuacct") == 0) {
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cpuacct= new CgroupSubsystem(tmproot, tmpmount);
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}
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}
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}
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fclose(mntinfo);
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if (memory == NULL) {
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log_debug(os, container)("Required cgroup memory subsystem not found");
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return;
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}
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if (cpuset == NULL) {
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log_debug(os, container)("Required cgroup cpuset subsystem not found");
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return;
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}
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if (cpu == NULL) {
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log_debug(os, container)("Required cgroup cpu subsystem not found");
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return;
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}
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if (cpuacct == NULL) {
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log_debug(os, container)("Required cgroup cpuacct subsystem not found");
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return;
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}
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/*
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* Read /proc/self/cgroup and map host mount point to
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* local one via /proc/self/mountinfo content above
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*
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* Docker example:
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* 5:memory:/docker/6558aed8fc662b194323ceab5b964f69cf36b3e8af877a14b80256e93aecb044
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*
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* Host example:
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* 5:memory:/user.slice
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*
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* Construct a path to the process specific memory and cpuset
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* cgroup directory.
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*
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* For a container running under Docker from memory example above
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* the paths would be:
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*
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* /sys/fs/cgroup/memory
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*
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* For a Host from memory example above the path would be:
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*
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* /sys/fs/cgroup/memory/user.slice
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*
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*/
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cgroup = fopen("/proc/self/cgroup", "r");
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if (cgroup == NULL) {
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log_debug(os, container)("Can't open /proc/self/cgroup, %s",
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os::strerror(errno));
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return;
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}
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while ((p = fgets(buf, MAXPATHLEN, cgroup)) != NULL) {
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char *controllers;
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char *token;
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char *base;
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/* Skip cgroup number */
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strsep(&p, ":");
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/* Get controllers and base */
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controllers = strsep(&p, ":");
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base = strsep(&p, "\n");
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if (controllers == NULL) {
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continue;
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}
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while ((token = strsep(&controllers, ",")) != NULL) {
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if (strcmp(token, "memory") == 0) {
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memory->set_subsystem_path(base);
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jlong hierarchy = uses_mem_hierarchy();
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if (hierarchy > 0) {
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memory->set_hierarchical(true);
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}
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} else if (strcmp(token, "cpuset") == 0) {
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cpuset->set_subsystem_path(base);
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} else if (strcmp(token, "cpu") == 0) {
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cpu->set_subsystem_path(base);
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} else if (strcmp(token, "cpuacct") == 0) {
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cpuacct->set_subsystem_path(base);
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}
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}
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}
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fclose(cgroup);
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// We need to update the amount of physical memory now that
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// command line arguments have been processed.
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if ((mem_limit = memory_limit_in_bytes()) > 0) {
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os::Linux::set_physical_memory(mem_limit);
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log_info(os, container)("Memory Limit is: " JLONG_FORMAT, mem_limit);
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}
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_is_containerized = true;
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}
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const char * OSContainer::container_type() {
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if (is_containerized()) {
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return "cgroupv1";
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} else {
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return NULL;
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}
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}
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/* uses_mem_hierarchy
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*
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* Return whether or not hierarchical cgroup accounting is being
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* done.
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*
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* return:
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* A number > 0 if true, or
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* OSCONTAINER_ERROR for not supported
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*/
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jlong OSContainer::uses_mem_hierarchy() {
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GET_CONTAINER_INFO(jlong, memory, "/memory.use_hierarchy",
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"Use Hierarchy is: " JLONG_FORMAT, JLONG_FORMAT, use_hierarchy);
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return use_hierarchy;
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}
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/* memory_limit_in_bytes
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*
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* Return the limit of available memory for this process.
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*
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* return:
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* memory limit in bytes or
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* -1 for unlimited
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* OSCONTAINER_ERROR for not supported
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*/
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jlong OSContainer::memory_limit_in_bytes() {
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GET_CONTAINER_INFO(julong, memory, "/memory.limit_in_bytes",
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"Memory Limit is: " JULONG_FORMAT, JULONG_FORMAT, memlimit);
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if (memlimit >= _unlimited_memory) {
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log_trace(os, container)("Non-Hierarchical Memory Limit is: Unlimited");
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if (memory->is_hierarchical()) {
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const char* matchline = "hierarchical_memory_limit";
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const char* format = "%s " JULONG_FORMAT;
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GET_CONTAINER_INFO_LINE(julong, memory, "/memory.stat", matchline,
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"Hierarchical Memory Limit is: " JULONG_FORMAT, format, hier_memlimit)
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if (hier_memlimit >= _unlimited_memory) {
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log_trace(os, container)("Hierarchical Memory Limit is: Unlimited");
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} else {
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return (jlong)hier_memlimit;
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}
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}
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return (jlong)-1;
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}
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else {
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return (jlong)memlimit;
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}
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}
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jlong OSContainer::memory_and_swap_limit_in_bytes() {
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GET_CONTAINER_INFO(julong, memory, "/memory.memsw.limit_in_bytes",
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"Memory and Swap Limit is: " JULONG_FORMAT, JULONG_FORMAT, memswlimit);
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if (memswlimit >= _unlimited_memory) {
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log_trace(os, container)("Non-Hierarchical Memory and Swap Limit is: Unlimited");
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|
if (memory->is_hierarchical()) {
|
|
const char* matchline = "hierarchical_memsw_limit";
|
|
const char* format = "%s " JULONG_FORMAT;
|
|
GET_CONTAINER_INFO_LINE(julong, memory, "/memory.stat", matchline,
|
|
"Hierarchical Memory and Swap Limit is : " JULONG_FORMAT, format, hier_memlimit)
|
|
if (hier_memlimit >= _unlimited_memory) {
|
|
log_trace(os, container)("Hierarchical Memory and Swap Limit is: Unlimited");
|
|
} else {
|
|
return (jlong)hier_memlimit;
|
|
}
|
|
}
|
|
return (jlong)-1;
|
|
} else {
|
|
return (jlong)memswlimit;
|
|
}
|
|
}
|
|
|
|
jlong OSContainer::memory_soft_limit_in_bytes() {
|
|
GET_CONTAINER_INFO(julong, memory, "/memory.soft_limit_in_bytes",
|
|
"Memory Soft Limit is: " JULONG_FORMAT, JULONG_FORMAT, memsoftlimit);
|
|
if (memsoftlimit >= _unlimited_memory) {
|
|
log_trace(os, container)("Memory Soft Limit is: Unlimited");
|
|
return (jlong)-1;
|
|
} else {
|
|
return (jlong)memsoftlimit;
|
|
}
|
|
}
|
|
|
|
/* memory_usage_in_bytes
|
|
*
|
|
* Return the amount of used memory for this process.
|
|
*
|
|
* return:
|
|
* memory usage in bytes or
|
|
* -1 for unlimited
|
|
* OSCONTAINER_ERROR for not supported
|
|
*/
|
|
jlong OSContainer::memory_usage_in_bytes() {
|
|
GET_CONTAINER_INFO(jlong, memory, "/memory.usage_in_bytes",
|
|
"Memory Usage is: " JLONG_FORMAT, JLONG_FORMAT, memusage);
|
|
return memusage;
|
|
}
|
|
|
|
/* memory_max_usage_in_bytes
|
|
*
|
|
* Return the maximum amount of used memory for this process.
|
|
*
|
|
* return:
|
|
* max memory usage in bytes or
|
|
* OSCONTAINER_ERROR for not supported
|
|
*/
|
|
jlong OSContainer::memory_max_usage_in_bytes() {
|
|
GET_CONTAINER_INFO(jlong, memory, "/memory.max_usage_in_bytes",
|
|
"Maximum Memory Usage is: " JLONG_FORMAT, JLONG_FORMAT, memmaxusage);
|
|
return memmaxusage;
|
|
}
|
|
|
|
/* active_processor_count
|
|
*
|
|
* Calculate an appropriate number of active processors for the
|
|
* VM to use based on these three inputs.
|
|
*
|
|
* cpu affinity
|
|
* cgroup cpu quota & cpu period
|
|
* cgroup cpu shares
|
|
*
|
|
* Algorithm:
|
|
*
|
|
* Determine the number of available CPUs from sched_getaffinity
|
|
*
|
|
* If user specified a quota (quota != -1), calculate the number of
|
|
* required CPUs by dividing quota by period.
|
|
*
|
|
* If shares are in effect (shares != -1), calculate the number
|
|
* of CPUs required for the shares by dividing the share value
|
|
* by PER_CPU_SHARES.
|
|
*
|
|
* All results of division are rounded up to the next whole number.
|
|
*
|
|
* If neither shares or quotas have been specified, return the
|
|
* number of active processors in the system.
|
|
*
|
|
* If both shares and quotas have been specified, the results are
|
|
* based on the flag PreferContainerQuotaForCPUCount. If true,
|
|
* return the quota value. If false return the smallest value
|
|
* between shares or quotas.
|
|
*
|
|
* If shares and/or quotas have been specified, the resulting number
|
|
* returned will never exceed the number of active processors.
|
|
*
|
|
* return:
|
|
* number of CPUs
|
|
*/
|
|
int OSContainer::active_processor_count() {
|
|
int quota_count = 0, share_count = 0;
|
|
int cpu_count, limit_count;
|
|
int result;
|
|
|
|
cpu_count = limit_count = os::Linux::active_processor_count();
|
|
int quota = cpu_quota();
|
|
int period = cpu_period();
|
|
int share = cpu_shares();
|
|
|
|
if (quota > -1 && period > 0) {
|
|
quota_count = ceilf((float)quota / (float)period);
|
|
log_trace(os, container)("CPU Quota count based on quota/period: %d", quota_count);
|
|
}
|
|
if (share > -1) {
|
|
share_count = ceilf((float)share / (float)PER_CPU_SHARES);
|
|
log_trace(os, container)("CPU Share count based on shares: %d", share_count);
|
|
}
|
|
|
|
// If both shares and quotas are setup results depend
|
|
// on flag PreferContainerQuotaForCPUCount.
|
|
// If true, limit CPU count to quota
|
|
// If false, use minimum of shares and quotas
|
|
if (quota_count !=0 && share_count != 0) {
|
|
if (PreferContainerQuotaForCPUCount) {
|
|
limit_count = quota_count;
|
|
} else {
|
|
limit_count = MIN2(quota_count, share_count);
|
|
}
|
|
} else if (quota_count != 0) {
|
|
limit_count = quota_count;
|
|
} else if (share_count != 0) {
|
|
limit_count = share_count;
|
|
}
|
|
|
|
result = MIN2(cpu_count, limit_count);
|
|
log_trace(os, container)("OSContainer::active_processor_count: %d", result);
|
|
return result;
|
|
}
|
|
|
|
char * OSContainer::cpu_cpuset_cpus() {
|
|
GET_CONTAINER_INFO_CPTR(cptr, cpuset, "/cpuset.cpus",
|
|
"cpuset.cpus is: %s", "%1023s", cpus, 1024);
|
|
return os::strdup(cpus);
|
|
}
|
|
|
|
char * OSContainer::cpu_cpuset_memory_nodes() {
|
|
GET_CONTAINER_INFO_CPTR(cptr, cpuset, "/cpuset.mems",
|
|
"cpuset.mems is: %s", "%1023s", mems, 1024);
|
|
return os::strdup(mems);
|
|
}
|
|
|
|
/* cpu_quota
|
|
*
|
|
* Return the number of milliseconds per period
|
|
* process is guaranteed to run.
|
|
*
|
|
* return:
|
|
* quota time in milliseconds
|
|
* -1 for no quota
|
|
* OSCONTAINER_ERROR for not supported
|
|
*/
|
|
int OSContainer::cpu_quota() {
|
|
GET_CONTAINER_INFO(int, cpu, "/cpu.cfs_quota_us",
|
|
"CPU Quota is: %d", "%d", quota);
|
|
return quota;
|
|
}
|
|
|
|
int OSContainer::cpu_period() {
|
|
GET_CONTAINER_INFO(int, cpu, "/cpu.cfs_period_us",
|
|
"CPU Period is: %d", "%d", period);
|
|
return period;
|
|
}
|
|
|
|
/* cpu_shares
|
|
*
|
|
* Return the amount of cpu shares available to the process
|
|
*
|
|
* return:
|
|
* Share number (typically a number relative to 1024)
|
|
* (2048 typically expresses 2 CPUs worth of processing)
|
|
* -1 for no share setup
|
|
* OSCONTAINER_ERROR for not supported
|
|
*/
|
|
int OSContainer::cpu_shares() {
|
|
GET_CONTAINER_INFO(int, cpu, "/cpu.shares",
|
|
"CPU Shares is: %d", "%d", shares);
|
|
// Convert 1024 to no shares setup
|
|
if (shares == 1024) return -1;
|
|
|
|
return shares;
|
|
}
|
|
|