8003237: G1: Reduce unnecessary (and failing) allocation attempts when handling an evacuation failure
Summary: Remember for every generation whether the memory for that generation has already been exhausted. If so, do not try to get a new region for these generations. Further, if the last generation is full, early exit from copy_to_survivor_space.
Reviewed-by: jmasa, brutisso
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/*
* @test
* @bug 8022865
* @summary Tests for the -XX:CompressedClassSpaceSize command line option
* @library /testlibrary
* @modules java.base/sun.misc
* java.management
* @run main CompressedClassSpaceSize
*/
import jdk.test.lib.*;
public class CompressedClassSpaceSize {
public static void main(String[] args) throws Exception {
ProcessBuilder pb;
OutputAnalyzer output;
if (Platform.is64bit()) {
// Minimum size is 1MB
pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=0",
"-version");
output = new OutputAnalyzer(pb.start());
output.shouldContain("outside the allowed range")
.shouldHaveExitValue(1);
// Invalid size of -1 should be handled correctly
pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=-1",
"-version");
output = new OutputAnalyzer(pb.start());
output.shouldContain("Improperly specified VM option 'CompressedClassSpaceSize=-1'")
.shouldHaveExitValue(1);
// Maximum size is 3GB
pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=4g",
"-version");
output = new OutputAnalyzer(pb.start());
output.shouldContain("outside the allowed range")
.shouldHaveExitValue(1);
// Make sure the minimum size is set correctly and printed
pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
"-XX:CompressedClassSpaceSize=1m",
"-XX:+PrintCompressedOopsMode",
"-version");
output = new OutputAnalyzer(pb.start());
output.shouldContain("Compressed class space size: 1048576")
.shouldHaveExitValue(0);
// Make sure the maximum size is set correctly and printed
pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
"-XX:CompressedClassSpaceSize=3g",
"-XX:+PrintCompressedOopsMode",
"-version");
output = new OutputAnalyzer(pb.start());
output.shouldContain("Compressed class space size: 3221225472")
.shouldHaveExitValue(0);
pb = ProcessTools.createJavaProcessBuilder("-XX:-UseCompressedOops",
"-XX:CompressedClassSpaceSize=1m",
"-version");
output = new OutputAnalyzer(pb.start());
output.shouldContain("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used")
.shouldHaveExitValue(0);
pb = ProcessTools.createJavaProcessBuilder("-XX:-UseCompressedClassPointers",
"-XX:CompressedClassSpaceSize=1m",
"-version");
output = new OutputAnalyzer(pb.start());
output.shouldContain("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used")
.shouldHaveExitValue(0);
} else {
// 32bit platforms doesn't have compressed oops
pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=1m",
"-version");
output = new OutputAnalyzer(pb.start());
output.shouldContain("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used")
.shouldHaveExitValue(0);
}
}
}