mirror of
https://github.com/openjdk/jdk.git
synced 2025-09-17 01:24:33 +02:00
8146115: Improve docker container detection and resource configuration usage
Reviewed-by: dholmes, kbarrett, phh
This commit is contained in:
Bob Vandette
parent
2f84103a78
commit
20a8de0f70
15 changed files with 899 additions and 13 deletions
594
src/hotspot/os/linux/osContainer_linux.cpp
Normal file
594
src/hotspot/os/linux/osContainer_linux.cpp
Normal file
|
|
@ -0,0 +1,594 @@
|
|||
/*
|
||||
* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
|
||||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
||||
*
|
||||
* This code is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License version 2 only, as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This code is distributed in the hope that it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* version 2 for more details (a copy is included in the LICENSE file that
|
||||
* accompanied this code).
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License version
|
||||
* 2 along with this work; if not, write to the Free Software Foundation,
|
||||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*
|
||||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
||||
* or visit www.oracle.com if you need additional information or have any
|
||||
* questions.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <string.h>
|
||||
#include <math.h>
|
||||
#include <errno.h>
|
||||
#include "utilities/globalDefinitions.hpp"
|
||||
#include "memory/allocation.hpp"
|
||||
#include "runtime/os.hpp"
|
||||
#include "logging/log.hpp"
|
||||
#include "osContainer_linux.hpp"
|
||||
|
||||
/*
|
||||
* Warning: Some linux distros use 0x7FFFFFFFFFFFF000
|
||||
* and others use 0x7FFFFFFFFFFFFFFF for unlimited.
|
||||
*/
|
||||
#define UNLIMITED_MEM CONST64(0x7FFFFFFFFFFFF000)
|
||||
|
||||
#define PER_CPU_SHARES 1024
|
||||
|
||||
bool OSContainer::_is_initialized = false;
|
||||
bool OSContainer::_is_containerized = false;
|
||||
|
||||
class CgroupSubsystem: CHeapObj<mtInternal> {
|
||||
friend class OSContainer;
|
||||
|
||||
private:
|
||||
/* mountinfo contents */
|
||||
char *_root;
|
||||
char *_mount_point;
|
||||
|
||||
/* Constructed subsystem directory */
|
||||
char *_path;
|
||||
|
||||
public:
|
||||
CgroupSubsystem(char *root, char *mountpoint) {
|
||||
_root = os::strdup(root);
|
||||
_mount_point = os::strdup(mountpoint);
|
||||
_path = NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Set directory to subsystem specific files based
|
||||
* on the contents of the mountinfo and cgroup files.
|
||||
*/
|
||||
void set_subsystem_path(char *cgroup_path) {
|
||||
char buf[MAXPATHLEN+1];
|
||||
if (_root != NULL && cgroup_path != NULL) {
|
||||
if (strcmp(_root, "/") == 0) {
|
||||
int buflen;
|
||||
strncpy(buf, _mount_point, MAXPATHLEN);
|
||||
buf[MAXPATHLEN-1] = '\0';
|
||||
if (strcmp(cgroup_path,"/") != 0) {
|
||||
buflen = strlen(buf);
|
||||
if ((buflen + strlen(cgroup_path)) > (MAXPATHLEN-1)) {
|
||||
return;
|
||||
}
|
||||
strncat(buf, cgroup_path, MAXPATHLEN-buflen);
|
||||
buf[MAXPATHLEN-1] = '\0';
|
||||
}
|
||||
_path = os::strdup(buf);
|
||||
} else {
|
||||
if (strcmp(_root, cgroup_path) == 0) {
|
||||
strncpy(buf, _mount_point, MAXPATHLEN);
|
||||
buf[MAXPATHLEN-1] = '\0';
|
||||
_path = os::strdup(buf);
|
||||
} else {
|
||||
char *p = strstr(_root, cgroup_path);
|
||||
if (p != NULL && p == _root) {
|
||||
if (strlen(cgroup_path) > strlen(_root)) {
|
||||
int buflen;
|
||||
strncpy(buf, _mount_point, MAXPATHLEN);
|
||||
buf[MAXPATHLEN-1] = '\0';
|
||||
buflen = strlen(buf);
|
||||
if ((buflen + strlen(cgroup_path)) > (MAXPATHLEN-1)) {
|
||||
return;
|
||||
}
|
||||
strncat(buf, cgroup_path + strlen(_root), MAXPATHLEN-buflen);
|
||||
buf[MAXPATHLEN-1] = '\0';
|
||||
_path = os::strdup(buf);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
char *subsystem_path() { return _path; }
|
||||
};
|
||||
|
||||
CgroupSubsystem* memory = NULL;
|
||||
CgroupSubsystem* cpuset = NULL;
|
||||
CgroupSubsystem* cpu = NULL;
|
||||
CgroupSubsystem* cpuacct = NULL;
|
||||
|
||||
typedef char * cptr;
|
||||
|
||||
PRAGMA_DIAG_PUSH
|
||||
PRAGMA_FORMAT_NONLITERAL_IGNORED
|
||||
template <typename T> int subsystem_file_contents(CgroupSubsystem* c,
|
||||
const char *filename,
|
||||
const char *scan_fmt,
|
||||
T returnval) {
|
||||
FILE *fp = NULL;
|
||||
char *p;
|
||||
char file[MAXPATHLEN+1];
|
||||
char buf[MAXPATHLEN+1];
|
||||
|
||||
if (c != NULL && c->subsystem_path() != NULL) {
|
||||
strncpy(file, c->subsystem_path(), MAXPATHLEN);
|
||||
file[MAXPATHLEN-1] = '\0';
|
||||
int filelen = strlen(file);
|
||||
if ((filelen + strlen(filename)) > (MAXPATHLEN-1)) {
|
||||
log_debug(os, container)("File path too long %s, %s", file, filename);
|
||||
return OSCONTAINER_ERROR;
|
||||
}
|
||||
strncat(file, filename, MAXPATHLEN-filelen);
|
||||
log_trace(os, container)("Path to %s is %s", filename, file);
|
||||
fp = fopen(file, "r");
|
||||
if (fp != NULL) {
|
||||
p = fgets(buf, MAXPATHLEN, fp);
|
||||
if (p != NULL) {
|
||||
int matched = sscanf(p, scan_fmt, returnval);
|
||||
if (matched == 1) {
|
||||
fclose(fp);
|
||||
return 0;
|
||||
} else {
|
||||
log_debug(os, container)("Type %s not found in file %s",
|
||||
scan_fmt , file);
|
||||
}
|
||||
} else {
|
||||
log_debug(os, container)("Empty file %s", file);
|
||||
}
|
||||
} else {
|
||||
log_debug(os, container)("Open of file %s failed, %s", file,
|
||||
os::strerror(errno));
|
||||
}
|
||||
}
|
||||
if (fp != NULL)
|
||||
fclose(fp);
|
||||
return OSCONTAINER_ERROR;
|
||||
}
|
||||
PRAGMA_DIAG_POP
|
||||
|
||||
#define GET_CONTAINER_INFO(return_type, subsystem, filename, \
|
||||
logstring, scan_fmt, variable) \
|
||||
return_type variable; \
|
||||
{ \
|
||||
int err; \
|
||||
err = subsystem_file_contents(subsystem, \
|
||||
filename, \
|
||||
scan_fmt, \
|
||||
&variable); \
|
||||
if (err != 0) \
|
||||
return (return_type) OSCONTAINER_ERROR; \
|
||||
\
|
||||
log_trace(os, container)(logstring, variable); \
|
||||
}
|
||||
|
||||
#define GET_CONTAINER_INFO_CPTR(return_type, subsystem, filename, \
|
||||
logstring, scan_fmt, variable, bufsize) \
|
||||
char variable[bufsize]; \
|
||||
{ \
|
||||
int err; \
|
||||
err = subsystem_file_contents(subsystem, \
|
||||
filename, \
|
||||
scan_fmt, \
|
||||
variable); \
|
||||
if (err != 0) \
|
||||
return (return_type) NULL; \
|
||||
\
|
||||
log_trace(os, container)(logstring, variable); \
|
||||
}
|
||||
|
||||
/* init
|
||||
*
|
||||
* Initialize the container support and determine if
|
||||
* we are running under cgroup control.
|
||||
*/
|
||||
void OSContainer::init() {
|
||||
int mountid;
|
||||
int parentid;
|
||||
int major;
|
||||
int minor;
|
||||
FILE *mntinfo = NULL;
|
||||
FILE *cgroup = NULL;
|
||||
char buf[MAXPATHLEN+1];
|
||||
char tmproot[MAXPATHLEN+1];
|
||||
char tmpmount[MAXPATHLEN+1];
|
||||
char tmpbase[MAXPATHLEN+1];
|
||||
char *p;
|
||||
jlong mem_limit;
|
||||
|
||||
assert(!_is_initialized, "Initializing OSContainer more than once");
|
||||
|
||||
_is_initialized = true;
|
||||
_is_containerized = false;
|
||||
|
||||
log_trace(os, container)("OSContainer::init: Initializing Container Support");
|
||||
if (!UseContainerSupport) {
|
||||
log_trace(os, container)("Container Support not enabled");
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Find the cgroup mount point for memory and cpuset
|
||||
* by reading /proc/self/mountinfo
|
||||
*
|
||||
* Example for docker:
|
||||
* 219 214 0:29 /docker/7208cebd00fa5f2e342b1094f7bed87fa25661471a4637118e65f1c995be8a34 /sys/fs/cgroup/memory ro,nosuid,nodev,noexec,relatime - cgroup cgroup rw,memory
|
||||
*
|
||||
* Example for host:
|
||||
* 34 28 0:29 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,memory
|
||||
*/
|
||||
mntinfo = fopen("/proc/self/mountinfo", "r");
|
||||
if (mntinfo == NULL) {
|
||||
log_debug(os, container)("Can't open /proc/self/mountinfo, %s",
|
||||
os::strerror(errno));
|
||||
return;
|
||||
}
|
||||
|
||||
while ( (p = fgets(buf, MAXPATHLEN, mntinfo)) != NULL) {
|
||||
// Look for the filesystem type and see if it's cgroup
|
||||
char fstype[MAXPATHLEN+1];
|
||||
fstype[0] = '\0';
|
||||
char *s = strstr(p, " - ");
|
||||
if (s != NULL &&
|
||||
sscanf(s, " - %s", fstype) == 1 &&
|
||||
strcmp(fstype, "cgroup") == 0) {
|
||||
|
||||
if (strstr(p, "memory") != NULL) {
|
||||
int matched = sscanf(p, "%d %d %d:%d %s %s",
|
||||
&mountid,
|
||||
&parentid,
|
||||
&major,
|
||||
&minor,
|
||||
tmproot,
|
||||
tmpmount);
|
||||
if (matched == 6) {
|
||||
memory = new CgroupSubsystem(tmproot, tmpmount);
|
||||
}
|
||||
else
|
||||
log_debug(os, container)("Incompatible str containing cgroup and memory: %s", p);
|
||||
} else if (strstr(p, "cpuset") != NULL) {
|
||||
int matched = sscanf(p, "%d %d %d:%d %s %s",
|
||||
&mountid,
|
||||
&parentid,
|
||||
&major,
|
||||
&minor,
|
||||
tmproot,
|
||||
tmpmount);
|
||||
if (matched == 6) {
|
||||
cpuset = new CgroupSubsystem(tmproot, tmpmount);
|
||||
}
|
||||
else {
|
||||
log_debug(os, container)("Incompatible str containing cgroup and cpuset: %s", p);
|
||||
}
|
||||
} else if (strstr(p, "cpu,cpuacct") != NULL) {
|
||||
int matched = sscanf(p, "%d %d %d:%d %s %s",
|
||||
&mountid,
|
||||
&parentid,
|
||||
&major,
|
||||
&minor,
|
||||
tmproot,
|
||||
tmpmount);
|
||||
if (matched == 6) {
|
||||
cpu = new CgroupSubsystem(tmproot, tmpmount);
|
||||
cpuacct = new CgroupSubsystem(tmproot, tmpmount);
|
||||
}
|
||||
else {
|
||||
log_debug(os, container)("Incompatible str containing cgroup and cpu,cpuacct: %s", p);
|
||||
}
|
||||
} else if (strstr(p, "cpuacct") != NULL) {
|
||||
int matched = sscanf(p, "%d %d %d:%d %s %s",
|
||||
&mountid,
|
||||
&parentid,
|
||||
&major,
|
||||
&minor,
|
||||
tmproot,
|
||||
tmpmount);
|
||||
if (matched == 6) {
|
||||
cpuacct = new CgroupSubsystem(tmproot, tmpmount);
|
||||
}
|
||||
else {
|
||||
log_debug(os, container)("Incompatible str containing cgroup and cpuacct: %s", p);
|
||||
}
|
||||
} else if (strstr(p, "cpu") != NULL) {
|
||||
int matched = sscanf(p, "%d %d %d:%d %s %s",
|
||||
&mountid,
|
||||
&parentid,
|
||||
&major,
|
||||
&minor,
|
||||
tmproot,
|
||||
tmpmount);
|
||||
if (matched == 6) {
|
||||
cpu = new CgroupSubsystem(tmproot, tmpmount);
|
||||
}
|
||||
else {
|
||||
log_debug(os, container)("Incompatible str containing cgroup and cpu: %s", p);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (mntinfo != NULL) fclose(mntinfo);
|
||||
|
||||
/*
|
||||
* Read /proc/self/cgroup and map host mount point to
|
||||
* local one via /proc/self/mountinfo content above
|
||||
*
|
||||
* Docker example:
|
||||
* 5:memory:/docker/6558aed8fc662b194323ceab5b964f69cf36b3e8af877a14b80256e93aecb044
|
||||
*
|
||||
* Host example:
|
||||
* 5:memory:/user.slice
|
||||
*
|
||||
* Construct a path to the process specific memory and cpuset
|
||||
* cgroup directory.
|
||||
*
|
||||
* For a container running under Docker from memory example above
|
||||
* the paths would be:
|
||||
*
|
||||
* /sys/fs/cgroup/memory
|
||||
*
|
||||
* For a Host from memory example above the path would be:
|
||||
*
|
||||
* /sys/fs/cgroup/memory/user.slice
|
||||
*
|
||||
*/
|
||||
cgroup = fopen("/proc/self/cgroup", "r");
|
||||
if (cgroup == NULL) {
|
||||
log_debug(os, container)("Can't open /proc/self/cgroup, %s",
|
||||
os::strerror(errno));
|
||||
return;
|
||||
}
|
||||
|
||||
while ( (p = fgets(buf, MAXPATHLEN, cgroup)) != NULL) {
|
||||
int cgno;
|
||||
int matched;
|
||||
char *controller;
|
||||
char *base;
|
||||
|
||||
/* Skip cgroup number */
|
||||
strsep(&p, ":");
|
||||
/* Get controller and base */
|
||||
controller = strsep(&p, ":");
|
||||
base = strsep(&p, "\n");
|
||||
|
||||
if (controller != NULL) {
|
||||
if (strstr(controller, "memory") != NULL) {
|
||||
memory->set_subsystem_path(base);
|
||||
} else if (strstr(controller, "cpuset") != NULL) {
|
||||
cpuset->set_subsystem_path(base);
|
||||
} else if (strstr(controller, "cpu,cpuacct") != NULL) {
|
||||
cpu->set_subsystem_path(base);
|
||||
cpuacct->set_subsystem_path(base);
|
||||
} else if (strstr(controller, "cpuacct") != NULL) {
|
||||
cpuacct->set_subsystem_path(base);
|
||||
} else if (strstr(controller, "cpu") != NULL) {
|
||||
cpu->set_subsystem_path(base);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (cgroup != NULL) fclose(cgroup);
|
||||
|
||||
if (memory == NULL || cpuset == NULL || cpu == NULL) {
|
||||
log_debug(os, container)("Required cgroup subsystems not found");
|
||||
return;
|
||||
}
|
||||
|
||||
// We need to update the amount of physical memory now that
|
||||
// command line arguments have been processed.
|
||||
if ((mem_limit = memory_limit_in_bytes()) > 0) {
|
||||
os::Linux::set_physical_memory(mem_limit);
|
||||
}
|
||||
|
||||
_is_containerized = true;
|
||||
|
||||
}
|
||||
|
||||
char * OSContainer::container_type() {
|
||||
if (is_containerized()) {
|
||||
return (char *)"cgroupv1";
|
||||
} else {
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/* memory_limit_in_bytes
|
||||
*
|
||||
* Return the limit of available memory for this process.
|
||||
*
|
||||
* return:
|
||||
* memory limit in bytes or
|
||||
* -1 for unlimited
|
||||
* OSCONTAINER_ERROR for not supported
|
||||
*/
|
||||
jlong OSContainer::memory_limit_in_bytes() {
|
||||
GET_CONTAINER_INFO(jlong, memory, "/memory.limit_in_bytes",
|
||||
"Memory Limit is: " JLONG_FORMAT, JLONG_FORMAT, memlimit);
|
||||
|
||||
if (memlimit >= UNLIMITED_MEM) {
|
||||
log_trace(os, container)("Memory Limit is: Unlimited");
|
||||
return (jlong)-1;
|
||||
}
|
||||
else {
|
||||
return memlimit;
|
||||
}
|
||||
}
|
||||
|
||||
jlong OSContainer::memory_and_swap_limit_in_bytes() {
|
||||
GET_CONTAINER_INFO(jlong, memory, "/memory.memsw.limit_in_bytes",
|
||||
"Memory and Swap Limit is: " JLONG_FORMAT, JLONG_FORMAT, memswlimit);
|
||||
if (memswlimit >= UNLIMITED_MEM) {
|
||||
log_trace(os, container)("Memory and Swap Limit is: Unlimited");
|
||||
return (jlong)-1;
|
||||
} else {
|
||||
return memswlimit;
|
||||
}
|
||||
}
|
||||
|
||||
jlong OSContainer::memory_soft_limit_in_bytes() {
|
||||
GET_CONTAINER_INFO(jlong, memory, "/memory.soft_limit_in_bytes",
|
||||
"Memory Soft Limit is: " JLONG_FORMAT, JLONG_FORMAT, memsoftlimit);
|
||||
if (memsoftlimit >= UNLIMITED_MEM) {
|
||||
log_trace(os, container)("Memory Soft Limit is: Unlimited");
|
||||
return (jlong)-1;
|
||||
} else {
|
||||
return 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 cgroup options.
|
||||
*
|
||||
* cpu affinity
|
||||
* cpu quota & cpu period
|
||||
* 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.
|
||||
*
|
||||
* Return the smaller number from the three different settings.
|
||||
*
|
||||
* return:
|
||||
* number of cpus
|
||||
* OSCONTAINER_ERROR if failure occured during extract of cpuset info
|
||||
*/
|
||||
int OSContainer::active_processor_count() {
|
||||
int cpu_count, share_count, quota_count;
|
||||
int share, quota, period;
|
||||
int result;
|
||||
|
||||
cpu_count = os::Linux::active_processor_count();
|
||||
|
||||
share = cpu_shares();
|
||||
if (share > -1) {
|
||||
share_count = ceilf((float)share / (float)PER_CPU_SHARES);
|
||||
log_trace(os, container)("cpu_share count: %d", share_count);
|
||||
} else {
|
||||
share_count = cpu_count;
|
||||
}
|
||||
|
||||
quota = cpu_quota();
|
||||
period = cpu_period();
|
||||
if (quota > -1 && period > 0) {
|
||||
quota_count = ceilf((float)quota / (float)period);
|
||||
log_trace(os, container)("quota_count: %d", quota_count);
|
||||
} else {
|
||||
quota_count = cpu_count;
|
||||
}
|
||||
|
||||
result = MIN2(cpu_count, MIN2(share_count, quota_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;
|
||||
}
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue