7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @summary Test corner case that overflows malloc site hashtable bucket
27 * @key nmt jcmd stress
28 * @library /testlibrary /testlibrary/whitebox
29 * @ignore - This test is disabled since it will stress NMT and timeout during normal testing
30 * @build MallocSiteHashOverflow
31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
32 * @run main/othervm/timeout=480 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow
33 */
34
35 import com.oracle.java.testlibrary.*;
36 import sun.hotspot.WhiteBox;
37
38 public class MallocSiteHashOverflow {
39 private static long K = 1024;
40 public static void main(String args[]) throws Exception {
41 String vm_name = System.getProperty("java.vm.name");
42
43 // For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket
44 // For 64-bit systems, create 64K + 1 malloc sites with the same hash bucket to overflow a hash bucket
45 long entries = 257;
46 if (Platform.is64bit()) {
47 entries = 64 * K + 1;
48 }
49
50 OutputAnalyzer output;
51 WhiteBox wb = WhiteBox.getWhiteBox();
52
53 // Grab my own PID
54 String pid = Integer.toString(ProcessTools.getProcessId());
55 ProcessBuilder pb = new ProcessBuilder();
56
57 wb.NMTOverflowHashBucket(entries);
58
59 // Run 'jcmd <pid> VM.native_memory summary'
60 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
61 output = new OutputAnalyzer(pb.start());
62 output.shouldContain("Tracking level has been downgraded due to lack of resources");
63 }
64 }
|
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @summary Test corner case that overflows malloc site hashtable bucket
27 * @requires sun.arch.data.model == "32"
28 * @key nmt jcmd stress
29 * @library /testlibrary /testlibrary/whitebox
30 * @build MallocSiteHashOverflow
31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow
33 */
34
35 import com.oracle.java.testlibrary.*;
36 import sun.hotspot.WhiteBox;
37
38 public class MallocSiteHashOverflow {
39
40 public static void main(String args[]) throws Exception {
41
42 // Size of entries based on malloc tracking header defined in mallocTracker.hpp
43 // For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket
44 long entries = 257;
45
46 OutputAnalyzer output;
47 WhiteBox wb = WhiteBox.getWhiteBox();
48 int MAX_HASH_SIZE = wb.NMTGetHashSize();
49
50 // Grab my own PID
51 String pid = Integer.toString(ProcessTools.getProcessId());
52 ProcessBuilder pb = new ProcessBuilder();
53
54 // Verify that current tracking level is "detail"
55 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
56 output = new OutputAnalyzer(pb.start());
57 output.shouldContain("Native Memory Tracking Statistics");
58
59 // Attempt to cause NMT to downgrade tracking level by allocating small amounts
60 // of memory with random pseudo call stack
61 int pc = 1;
62 for (int i = 0; i < entries; i++) {
63 long addr = wb.NMTMallocWithPseudoStack(1, pc);
64 if (addr == 0) {
65 throw new RuntimeException("NMTMallocWithPseudoStack: out of memory");
66 }
67 // We free memory here since it doesn't affect pseudo malloc alloc site hash table entries
68 wb.NMTFree(addr);
69 pc += MAX_HASH_SIZE;
70 if (i == entries) {
71 // Verify that tracking has been downgraded
72 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
73 output = new OutputAnalyzer(pb.start());
74 output.shouldContain("Tracking level has been downgraded due to lack of resources");
75 }
76 }
77 }
78 }
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