8196062: Enable docker container related tests for linux ppc64le

Also fix cgroup subsystem recognition

Reviewed-by: goetz, dsamersoff, bobv

src/hotspot/os/linux/osContainer_linux.cpp

@@ -122,7 +122,15 @@ template <typename T> int subsystem_file_contents(CgroupSubsystem* c,
   char file[MAXPATHLEN+1];
   char buf[MAXPATHLEN+1];
 
-  if (c != NULL && c->subsystem_path() != NULL) {
+  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);
@@ -141,16 +149,13 @@ template <typename T> int subsystem_file_contents(CgroupSubsystem* c,
         fclose(fp);
         return 0;
       } else {
-          log_debug(os, container)("Type %s not found in file %s",
+        log_debug(os, container)("Type %s not found in file %s", scan_fmt, file);
-                                     scan_fmt , file);
       }
     } else {
       log_debug(os, container)("Empty file %s", file);
     }
   } else {
-      log_debug(os, container)("Open of file %s failed, %s", file,
+    log_debug(os, container)("Open of file %s failed, %s", file, os::strerror(errno));
-                               os::strerror(errno));
-    }
   }
   if (fp != NULL)
     fclose(fp);
@@ -273,7 +278,7 @@ void OSContainer::init() {
         else {
           log_debug(os, container)("Incompatible str containing cgroup and cpuset: %s", p);
         }
-      } else if (strstr(p, "cpu,cpuacct") != NULL) {
+      } else if (strstr(p, "cpu,cpuacct") != NULL || strstr(p, "cpuacct,cpu") != NULL) {
         int matched = sscanf(p, "%d %d %d:%d %s %s",
                              &mountid,
                              &parentid,
@@ -322,8 +327,20 @@ void OSContainer::init() {
 
   fclose(mntinfo);
 
-  if (memory == NULL || cpuset == NULL || cpu == NULL || cpuacct == NULL) {
+  if (memory == NULL) {
-    log_debug(os, container)("Required cgroup subsystems not found");
+    log_debug(os, container)("Required cgroup memory subsystem not found");
+    return;
+  }
+  if (cpuset == NULL) {
+    log_debug(os, container)("Required cgroup cpuset subsystem not found");
+    return;
+  }
+  if (cpu == NULL) {
+    log_debug(os, container)("Required cgroup cpu subsystem not found");
+    return;
+  }
+  if (cpuacct == NULL) {
+    log_debug(os, container)("Required cgroup cpuacct subsystem not found");
     return;
   }
 
@@ -374,7 +391,7 @@ void OSContainer::init() {
         memory->set_subsystem_path(base);
       } else if (strstr(controller, "cpuset") != NULL) {
         cpuset->set_subsystem_path(base);
-      } else if (strstr(controller, "cpu,cpuacct") != NULL) {
+      } else if (strstr(controller, "cpu,cpuacct") != NULL || strstr(controller, "cpuacct,cpu") != NULL) {
         cpu->set_subsystem_path(base);
         cpuacct->set_subsystem_path(base);
       } else if (strstr(controller, "cpuacct") != NULL) {

test/hotspot/jtreg/runtime/containers/docker/Dockerfile-BasicTest-ppc64le

@@ -0,0 +1,10 @@
+# test on x86_64 uses Oracle Linux but we do not have this for ppc64le
+# so use some other Linux where OpenJDK works 
+# FROM oraclelinux:7.2
+FROM ppc64le/ubuntu
+
+COPY /jdk /jdk
+
+ENV JAVA_HOME=/jdk
+
+CMD ["/bin/bash"]

test/jtreg-ext/requires/VMProps.java

@@ -352,9 +352,11 @@ public class VMProps implements Callable<Map<String, String>> {
      * @return true if docker is supported in a given environment
      */
     protected String dockerSupport() {
-        // currently docker testing is only supported for Linux-x64
+        // currently docker testing is only supported for Linux-x64 and Linux-ppc64le
-        if (! ( Platform.isLinux() && Platform.isX64() ) )
+        String arch = System.getProperty("os.arch");
+        if (! (Platform.isLinux() && (Platform.isX64() || arch.equals("ppc64le")))) {
             return "false";
+        }
 
         boolean isSupported;
         try {

test/lib/jdk/test/lib/containers/docker/DockerTestUtils.java

@@ -34,6 +34,7 @@ import java.nio.file.attribute.BasicFileAttributes;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import jdk.test.lib.Platform;
 import jdk.test.lib.Utils;
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.process.ProcessTools;
@@ -109,7 +110,9 @@ public class DockerTestUtils {
      * The jdk will be placed under the "/jdk/" folder inside the docker file system.
      *
      * @param imageName     name of the image to be created, including version tag
-     * @param dockerfile    name of the dockerfile residing in the test source
+     * @param dockerfile    name of the dockerfile residing in the test source;
+     *                      we check for a platform specific dockerfile as well
+     *                      and use this one in case it exists
      * @param buildDirName  name of the docker build/staging directory, which will
      *                      be created in the jtreg's scratch folder
      * @throws Exception
@@ -122,6 +125,11 @@ public class DockerTestUtils {
         if (Files.exists(buildDir)) {
             throw new RuntimeException("The docker build directory already exists: " + buildDir);
         }
+        // check for the existance of a platform specific docker file as well
+        String platformSpecificDockerfile = dockerfile + "-" + Platform.getOsArch();
+        if (Files.exists(Paths.get(Utils.TEST_SRC, platformSpecificDockerfile))) {
+          dockerfile = platformSpecificDockerfile;
+        }
 
         Path jdkSrcDir = Paths.get(Utils.TEST_JDK);
         Path jdkDstDir = buildDir.resolve("jdk");