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 TestSmallHeap
26 * @bug 8067438 8152239
27 * @requires vm.gc=="null"
28 * @summary Verify that starting the VM with a small heap works
29 * @library /test/lib
30 * @modules java.base/jdk.internal.misc
31 * @modules java.management/sun.management
32 * @build sun.hotspot.WhiteBox
33 * @run main ClassFileInstaller sun.hotspot.WhiteBox
34 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestSmallHeap
35 */
36
37 /* Note: It would be nice to verify the minimal supported heap size here,
38 * but we align the heap size based on the card table size. And the card table
39 * size is aligned based on the minimal pages size provided by the os. This
40 * means that on most platforms, where the minimal page size is 4k, we get a
41 * minimal heap size of 2m but on Solaris/Sparc we have a page size of 8k and
42 * get a minimal heap size of 4m. And on platforms where the page size is 64k
43 * we get a minimal heap size of 32m. We never use large pages for the card table.
44 *
45 * There is also no check in the VM for verifying that the maximum heap size
46 * is larger than the supported minimal heap size.
47 *
48 * To work around these behaviors this test uses -Xmx4m but then
49 * calculates what the expected heap size should be. The calculation is a
50 * simplified version of the code in the VM. We assume that the card table will
51 * use one page. Each byte in the card table corresponds to 512 bytes on the heap.
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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 TestSmallHeap
26 * @bug 8067438 8152239
27 * @requires vm.gc=="null"
28 * @summary Verify that starting the VM with a small heap works
29 * @library /test/lib
30 * @modules java.base/jdk.internal.misc
31 * @build sun.hotspot.WhiteBox
32 * @run main ClassFileInstaller sun.hotspot.WhiteBox
33 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestSmallHeap
34 */
35
36 /* Note: It would be nice to verify the minimal supported heap size here,
37 * but we align the heap size based on the card table size. And the card table
38 * size is aligned based on the minimal pages size provided by the os. This
39 * means that on most platforms, where the minimal page size is 4k, we get a
40 * minimal heap size of 2m but on Solaris/Sparc we have a page size of 8k and
41 * get a minimal heap size of 4m. And on platforms where the page size is 64k
42 * we get a minimal heap size of 32m. We never use large pages for the card table.
43 *
44 * There is also no check in the VM for verifying that the maximum heap size
45 * is larger than the supported minimal heap size.
46 *
47 * To work around these behaviors this test uses -Xmx4m but then
48 * calculates what the expected heap size should be. The calculation is a
49 * simplified version of the code in the VM. We assume that the card table will
50 * use one page. Each byte in the card table corresponds to 512 bytes on the heap.
|