The CMS improvements I&#x27;ve mentioned to are being contributed by a 3rd party. Based on the mailing list posts[1] I think it was google.<p>[1] <a href="http:&#x2F;&#x2F;mail.openjdk.java.net&#x2F;pipermail&#x2F;hotspot-gc-dev&#x2F;2015-June&#x2F;013784.html" rel="nofollow">http:&#x2F;&#x2F;mail.openjdk.java.net&#x2F;pipermail&#x2F;hotspot-gc-dev&#x2F;2015-J...</a>