8313083: Print 'rss' and 'cache' as part of the container information

src/hotspot/os/linux/cgroupSubsystem_linux.hpp

@@ -266,6 +266,8 @@ class CgroupSubsystem: public CHeapObj<mtInternal> {
     virtual jlong memory_and_swap_limit_in_bytes() = 0;
     virtual jlong memory_soft_limit_in_bytes() = 0;
     virtual jlong memory_max_usage_in_bytes() = 0;
+    virtual jlong rss_usage_in_bytes() = 0;
+    virtual jlong cache_usage_in_bytes() = 0;
 
     virtual char * cpu_cpuset_cpus() = 0;
     virtual char * cpu_cpuset_memory_nodes() = 0;

src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp

@@ -214,6 +214,17 @@ jlong CgroupV1Subsystem::memory_max_usage_in_bytes() {
   return memmaxusage;
 }
 
+jlong CgroupV1Subsystem::rss_usage_in_bytes() {
+  GET_CONTAINER_INFO_LINE(julong, _memory->controller(), "/memory.stat",
+                          "rss", JULONG_FORMAT, JULONG_FORMAT, rss);
+  return rss;
+}
+
+jlong CgroupV1Subsystem::cache_usage_in_bytes() {
+  GET_CONTAINER_INFO_LINE(julong, _memory->controller(), "/memory.stat",
+                          "cache", JULONG_FORMAT, JULONG_FORMAT, cache);
+  return cache;
+}
 
 jlong CgroupV1Subsystem::kernel_memory_usage_in_bytes() {
   GET_CONTAINER_INFO(jlong, _memory->controller(), "/memory.kmem.usage_in_bytes",

src/hotspot/os/linux/cgroupV1Subsystem_linux.hpp

@@ -79,6 +79,8 @@ class CgroupV1Subsystem: public CgroupSubsystem {
     jlong memory_soft_limit_in_bytes();
     jlong memory_usage_in_bytes();
     jlong memory_max_usage_in_bytes();
+    jlong rss_usage_in_bytes();
+    jlong cache_usage_in_bytes();
 
     jlong kernel_memory_usage_in_bytes();
     jlong kernel_memory_limit_in_bytes();

src/hotspot/os/linux/cgroupV2Subsystem_linux.cpp

@@ -139,6 +139,18 @@ jlong CgroupV2Subsystem::memory_max_usage_in_bytes() {
   return OSCONTAINER_ERROR; // not supported
 }
 
+jlong CgroupV2Subsystem::rss_usage_in_bytes() {
+  GET_CONTAINER_INFO_LINE(julong, _memory->controller(), "/memory.stat",
+                          "anon", JULONG_FORMAT, JULONG_FORMAT, rss);
+  return rss;
+}
+
+jlong CgroupV2Subsystem::cache_usage_in_bytes() {
+  GET_CONTAINER_INFO_LINE(julong, _memory->controller(), "/memory.stat",
+                          "file", JULONG_FORMAT, JULONG_FORMAT, cache);
+  return cache;
+}
+
 char* CgroupV2Subsystem::mem_soft_limit_val() {
   GET_CONTAINER_INFO_CPTR(cptr, _unified, "/memory.low",
                          "Memory Soft Limit is: %s", "%1023s", mem_soft_limit_str, 1024);

src/hotspot/os/linux/cgroupV2Subsystem_linux.hpp

@@ -78,6 +78,8 @@ class CgroupV2Subsystem: public CgroupSubsystem {
     jlong memory_soft_limit_in_bytes();
     jlong memory_usage_in_bytes();
     jlong memory_max_usage_in_bytes();
+    jlong rss_usage_in_bytes();
+    jlong cache_usage_in_bytes();
 
     char * cpu_cpuset_cpus();
     char * cpu_cpuset_memory_nodes();

src/hotspot/os/linux/osContainer_linux.cpp

@@ -91,6 +91,16 @@ jlong OSContainer::memory_max_usage_in_bytes() {
   return cgroup_subsystem->memory_max_usage_in_bytes();
 }
 
+jlong OSContainer::rss_usage_in_bytes() {
+  assert(cgroup_subsystem != nullptr, "cgroup subsystem not available");
+  return cgroup_subsystem->rss_usage_in_bytes();
+}
+
+jlong OSContainer::cache_usage_in_bytes() {
+  assert(cgroup_subsystem != nullptr, "cgroup subsystem not available");
+  return cgroup_subsystem->cache_usage_in_bytes();
+}
+
 void OSContainer::print_version_specific_info(outputStream* st) {
   assert(cgroup_subsystem != NULL, "cgroup subsystem not available");
   cgroup_subsystem->print_version_specific_info(st);

src/hotspot/os/linux/osContainer_linux.hpp

@@ -55,6 +55,8 @@ class OSContainer: AllStatic {
   static jlong memory_soft_limit_in_bytes();
   static jlong memory_usage_in_bytes();
   static jlong memory_max_usage_in_bytes();
+  static jlong rss_usage_in_bytes();
+  static jlong cache_usage_in_bytes();
 
   static int active_processor_count();
 

src/hotspot/os/linux/os_linux.cpp

@@ -2387,6 +2387,8 @@ bool os::Linux::print_container_info(outputStream* st) {
   OSContainer::print_container_helper(st, OSContainer::memory_soft_limit_in_bytes(), "memory_soft_limit_in_bytes");
   OSContainer::print_container_helper(st, OSContainer::memory_usage_in_bytes(), "memory_usage_in_bytes");
   OSContainer::print_container_helper(st, OSContainer::memory_max_usage_in_bytes(), "memory_max_usage_in_bytes");
+  OSContainer::print_container_helper(st, OSContainer::rss_usage_in_bytes(), "rss_usage_in_bytes");
+  OSContainer::print_container_helper(st, OSContainer::cache_usage_in_bytes(), "cache_usage_in_bytes");
 
   OSContainer::print_version_specific_info(st);
 

test/hotspot/jtreg/containers/docker/TestMisc.java

@@ -117,7 +117,9 @@ private static void checkContainerInfo(OutputAnalyzer out) throws Exception {
             "Maximum Memory Usage",
             "memory_max_usage_in_bytes",
             "maximum number of tasks",
-            "current number of tasks"
+            "current number of tasks",
+            "rss_usage_in_bytes",
+            "cache_usage_in_bytes"
         };
 
         for (String s : expectedToContain) {