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8253797: [cgroups v2] Account for the fact that swap accounting is disabled on some systems

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Reviewed-by: hseigel
This commit is contained in:
Severin Gehwolf 2020-12-10 16:47:02 +00:00
parent 6be1f5671e
commit 669361117d
2 changed files with 44 additions and 21 deletions
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23
src/java.base/linux/classes/jdk/internal/platform/cgroupv2/CgroupV2Subsystem.java
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@ -48,16 +48,21 @@ public class CgroupV2Subsystem implements CgroupSubsystem {
private static final int PER_CPU_SHARES = 1024;
private static final String MAX_VAL = "max";
private static final Object EMPTY_STR = "";
private static final long NO_SWAP = 0;
private CgroupV2Subsystem(CgroupSubsystemController unified) {
this.unified = unified;
}
private long getLongVal(String file) {
private long getLongVal(String file, long defaultValue) {
return CgroupSubsystemController.getLongValue(unified,
file,
CgroupV2SubsystemController::convertStringToLong,
CgroupSubsystem.LONG_RETVAL_UNLIMITED);
defaultValue);
}
private long getLongVal(String file) {
return getLongVal(file, CgroupSubsystem.LONG_RETVAL_UNLIMITED);
}
private static CgroupV2Subsystem initSubsystem() {
@ -289,6 +294,11 @@ public class CgroupV2Subsystem implements CgroupSubsystem {
@Override
public long getMemoryAndSwapLimit() {
String strVal = CgroupSubsystemController.getStringValue(unified, "memory.swap.max");
// We only get a null string when file memory.swap.max doesn't exist.
// In that case we return the memory limit without any swap.
if (strVal == null) {
return getMemoryLimit();
}
long swapLimit = limitFromString(strVal);
if (swapLimit >= 0) {
long memoryLimit = getMemoryLimit();
@ -307,9 +317,14 @@ public class CgroupV2Subsystem implements CgroupSubsystem {
*/
@Override
public long getMemoryAndSwapUsage() {
long swapUsage = getLongVal("memory.swap.current");
long memoryUsage = getMemoryUsage();
return memoryUsage + swapUsage;
if (memoryUsage >= 0) {
// If file memory.swap.current doesn't exist, only return the regular
// memory usage (without swap). Thus, use default value of NO_SWAP.
long swapUsage = getLongVal("memory.swap.current", NO_SWAP);
return memoryUsage + swapUsage;
}
return memoryUsage; // case of no memory limits
}
@Override