This bug is a follow-up to this thread:

http://mail.openjdk.java.net/pipermail/hotspot-dev/2013-September/010803.html

The changes for JDK-8007074 are causing a significant slowdown in the execution of jdk_core and jdk_svc tests on a machine running Ubuntu 12.0.4.1 LTS (64-bit) on Intel Xeon E5345 hardware. See attached image for the test execution times to see the significant jump from 45mins to >1h to run the tests at concurrency=4. The jump from under 45 minutes to 70+ minutes corresponds to when jdk8/tl was updated from jdk8-b104 to jdk8-b106 (since up to hs25-b48).

From what I can tell, the changes in JDK-8007074 mean that large pages are being used when they weren't previously. Running with -XX:-UseLargePages restores the performance.