public void setCoreOnOOM(boolean coreOnOOM) {
        if ( ! coreOnOOM) {
            environmentVariables.put("VESPA_SILENCE_CORE_ON_OOM", true);
        } else {
            environmentVariables.remove("VESPA_SILENCE_CORE_ON_OOM");
        }
    }
If larger or equal to 0 it mean that explicit mmaps shall not be included in coredump.
config-model/src/main/java/com/yahoo/vespa/model/AbstractService.java