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8130434: [TESTBUG] Harden TestLargePageUseForAuxMemory for more page size combinations

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Reviewed-by: tschatzl
This commit is contained in:
Goetz Lindenmaier 2015-07-22 16:25:20 +02:00
parent 19857b164b
commit dbdadd5e40
1 changed files with 23 additions and 4 deletions
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27
hotspot/test/gc/g1/TestLargePageUseForAuxMemory.java
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@ -94,29 +94,47 @@ public class TestLargePageUseForAuxMemory {
output.shouldHaveExitValue(0);
}
private static long gcd(long x, long y) {
while (x > 0) {
long t = x;
x = y % x;
y = t;
}
return y;
}
private static long lcm(long x, long y) {
return x * (y / gcd(x, y));
}
public static void main(String[] args) throws Exception {
if (!Platform.isDebugBuild()) {
System.out.println("Skip tests on non-debug builds because the required option TracePageSizes is a debug-only option.");
return;
}
// Size that a single card covers.
final int cardSize = 512;
WhiteBox wb = WhiteBox.getWhiteBox();
smallPageSize = wb.getVMPageSize();
largePageSize = wb.getVMLargePageSize();
allocGranularity = wb.getVMAllocationGranularity();
final long heapAlignment = lcm(cardSize * smallPageSize, largePageSize);
if (largePageSize == 0) {
System.out.println("Skip tests because large page support does not seem to be available on this platform.");
return;
}
if (largePageSize == smallPageSize) {
System.out.println("Skip tests because large page support does not seem to be available on this platform." +
"Small and large page size are the same.");
return;
}
// To get large pages for the card table etc. we need at least a 1G heap (with 4k page size).
// 32 bit systems will have problems reserving such an amount of contiguous space, so skip the
// test there.
if (!Platform.is32bit()) {
// Size that a single card covers.
final int cardSize = 512;
final long heapSizeForCardTableUsingLargePages = largePageSize * cardSize;
final long heapSizeDiffForCardTable = Math.max(Math.max(allocGranularity * cardSize, HEAP_REGION_SIZE), largePageSize);
@ -131,7 +149,8 @@ public class TestLargePageUseForAuxMemory {
// everywhere.
final int bitmapTranslationFactor = 8 * 8; // ObjectAlignmentInBytes * BitsPerByte
final long heapSizeForBitmapUsingLargePages = largePageSize * bitmapTranslationFactor;
final long heapSizeDiffForBitmap = Math.max(Math.max(allocGranularity * bitmapTranslationFactor, HEAP_REGION_SIZE), largePageSize);
final long heapSizeDiffForBitmap = Math.max(Math.max(allocGranularity * bitmapTranslationFactor, HEAP_REGION_SIZE),
Math.max(largePageSize, heapAlignment));
Asserts.assertGT(heapSizeForBitmapUsingLargePages, heapSizeDiffForBitmap,
"To test we would require to use an invalid heap size");