(original) (raw)
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 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
...
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