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src/hotspot/os/linux/osContainer_linux.cpp
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@ rev 53302 : [Containers] Also consider hierarchical memory limits.
|
~
@@ -120,11 +120,29 @@
}
char *subsystem_path() { return _path; }
};
-CgroupSubsystem* memory = NULL;
+class CgroupMemorySubsystem: CgroupSubsystem {
+ friend class OSContainer;
+
+ private:
+ /* Some container runtimes set limits via cgroup
+ * hierarchy. If set to true consider also memory.stat
+ * file if everything else seems unlimited */
+ bool _uses_mem_hierarchy;
+
+ public:
+ CgroupMemorySubsystem(char *root, char *mountpoint) : CgroupSubsystem::CgroupSubsystem(root, mountpoint) {
+ _uses_mem_hierarchy = false;
+ }
+
+ bool is_hierarchical() { return _uses_mem_hierarchy; }
+ void set_hierarchical(bool value) { _uses_mem_hierarchy = value; }
+};
+
+CgroupMemorySubsystem* memory = NULL;
CgroupSubsystem* cpuset = NULL;
CgroupSubsystem* cpu = NULL;
CgroupSubsystem* cpuacct = NULL;
typedef char * cptr;
@@ -179,10 +197,69 @@
fclose(fp);
return OSCONTAINER_ERROR;
}
PRAGMA_DIAG_POP
+PRAGMA_DIAG_PUSH
+PRAGMA_FORMAT_NONLITERAL_IGNORED
+template <typename T> int subsystem_file_line_contents(CgroupSubsystem* c,
+ const char *filename,
+ const char *matchline,
+ const char *scan_fmt,
+ T returnval) {
+ FILE *fp = NULL;
+ char *p;
+ char file[MAXPATHLEN+1];
+ char buf[MAXPATHLEN+1];
+ char discard[MAXPATHLEN+1];
+
+ if (c == NULL) {
+ log_debug(os, container)("subsystem_file_contents: CgroupSubsytem* is NULL");
+ return OSCONTAINER_ERROR;
+ }
+ if (c->subsystem_path() == NULL) {
+ log_debug(os, container)("subsystem_file_contents: subsystem path is NULL");
+ return OSCONTAINER_ERROR;
+ }
+
+ 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) {
+ int err = 0;
+ while ((p = fgets(buf, MAXPATHLEN, fp)) != NULL) {
+ if (strstr(p, matchline) != NULL) {
+ // discard matchline string prefix
+ int matched = sscanf(p, scan_fmt, discard, returnval);
+ if (matched == 2) {
+ fclose(fp);
+ return 0;
+ } else {
+ err = 1;
+ log_debug(os, container)("Type %s not found in file %s", scan_fmt, file);
+ }
+ }
+ }
+ if (err == 0) {
+ log_debug(os, container)("Empty file %s, or no match found for %s", file, matchline);
+ }
+ } 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; \
@@ -209,10 +286,26 @@
return (return_type) NULL; \
\
log_trace(os, container)(logstring, variable); \
}
+#define GET_CONTAINER_INFO_LINE(return_type, subsystem, filename, \
+ matchline, logstring, scan_fmt, variable) \
+ return_type variable; \
+{ \
+ int err; \
+ err = subsystem_file_line_contents(subsystem, \
+ filename, \
+ matchline, \
+ scan_fmt, \
+ &variable); \
+ if (err != 0) \
+ return (return_type) OSCONTAINER_ERROR; \
+ \
+ log_trace(os, container)(logstring, variable); \
+}
+
/* init
*
* Initialize the container support and determine if
* we are running under cgroup control.
*/
@@ -276,11 +369,11 @@
&major,
&minor,
tmproot,
tmpmount);
if (matched == 6) {
- memory = new CgroupSubsystem(tmproot, tmpmount);
+ memory = new CgroupMemorySubsystem(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",
@@ -405,10 +498,14 @@
base = strsep(&p, "\n");
if (controller != NULL) {
if (strstr(controller, "memory") != NULL) {
memory->set_subsystem_path(base);
+ jlong hierarchy = uses_mem_hierarchy();
+ if (hierarchy > 0) {
+ memory->set_hierarchical(true);
+ }
} else if (strstr(controller, "cpuset") != NULL) {
cpuset->set_subsystem_path(base);
} else if (strstr(controller, "cpu,cpuacct") != NULL || strstr(controller, "cpuacct,cpu") != NULL) {
cpu->set_subsystem_path(base);
cpuacct->set_subsystem_path(base);
@@ -424,10 +521,11 @@
// 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);
+ log_info(os, container)("Memory Limit is: " JLONG_FORMAT, mem_limit);
}
_is_containerized = true;
}
@@ -438,10 +536,25 @@
} else {
return NULL;
}
}
+/* uses_mem_hierarchy
+ *
+ * Return whether or not hierarchical cgroup accounting is being
+ * done.
+ *
+ * return:
+ * A number > 0 if true, or
+ * OSCONTAINER_ERROR for not supported
+ */
+jlong OSContainer::uses_mem_hierarchy() {
+ GET_CONTAINER_INFO(jlong, memory, "/memory.use_hierarchy",
+ "Use Hierarchy is: " JLONG_FORMAT, JLONG_FORMAT, use_hierarchy);
+ return use_hierarchy;
+}
+
/* memory_limit_in_bytes
*
* Return the limit of available memory for this process.
*
@@ -453,11 +566,22 @@
jlong OSContainer::memory_limit_in_bytes() {
GET_CONTAINER_INFO(julong, memory, "/memory.limit_in_bytes",
"Memory Limit is: " JULONG_FORMAT, JULONG_FORMAT, memlimit);
if (memlimit >= _unlimited_memory) {
- log_trace(os, container)("Memory Limit is: Unlimited");
+ log_trace(os, container)("Non-Hierarchical Memory Limit is: Unlimited");
+ if (memory->is_hierarchical()) {
+ const char* matchline = "hierarchical_memory_limit";
+ char* format = "%s " JULONG_FORMAT;
+ GET_CONTAINER_INFO_LINE(julong, memory, "/memory.stat", matchline,
+ "Hierarchical Memory Limit is: " JULONG_FORMAT, format, hier_memlimit)
+ if (hier_memlimit >= _unlimited_memory) {
+ log_trace(os, container)("Hierarchical Memory Limit is: Unlimited");
+ } else {
+ return (jlong)hier_memlimit;
+ }
+ }
return (jlong)-1;
}
else {
return (jlong)memlimit;
}
@@ -465,11 +589,22 @@
jlong OSContainer::memory_and_swap_limit_in_bytes() {
GET_CONTAINER_INFO(julong, memory, "/memory.memsw.limit_in_bytes",
"Memory and Swap Limit is: " JULONG_FORMAT, JULONG_FORMAT, memswlimit);
if (memswlimit >= _unlimited_memory) {
- log_trace(os, container)("Memory and Swap Limit is: Unlimited");
+ log_trace(os, container)("Non-Hierarchical Memory and Swap Limit is: Unlimited");
+ if (memory->is_hierarchical()) {
+ const char* matchline = "hierarchical_memsw_limit";
+ 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;
}
}
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