I filed https://bugs.openjdk.java.net/browse/JDK-8087107 and attached a patch to the ticket that exposes some useful code cache stats as perf data counters:
$ jcmd <pid> PerfCounter.print | grep -i "sun\.ci\." sun.ci.codeCacheCapacity=6291456 sun.ci.codeCacheMaxCapacity=6291456 sun.ci.codeCacheMethodsReclaimedNum=1030 sun.ci.codeCacheSweepsTotalNum=93 sun.ci.codeCacheSweepsTotalTimeMillis=63 sun.ci.codeCacheUsed=3386880 ... At Twitter, we've found this useful for easy monitoring of code cache activity, and would like to see this integrated into OpenJDK. thanks! -- ramki
