[9] RFR(M): 8054292 : code comments leak in fastdebug builds

David Chase david.r.chase at oracle.com
Fri Aug 29 19:16:05 UTC 2014

On 2014-08-28, at 1:51 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> On 8/28/14 6:28 AM, David Chase wrote:
>> Revised changes: http://cr.openjdk.java.net/~drchase/8054292/webrev-for-leak-checks.12/

>> Added placement-new-constructor call in InterpreterCodelet (to allow that extra assert).
> This one I am not sure. It could hide potential memory leak when constructor overwrite previously stored _strings values. But I agree that it is the simplest change to enable the assert. And based on what I see in current code it should not cause a leak because we assign default NULL to _strings several times until the final store in ~CodeletMark().
> In short, I accept current change but, please, file RFE (starter task) to clean this code. As I said before strings recording for InterpreterCodelet could be done differently (do not do it generally for Stub class).

Chris seemed to think that though this could leak, it was bounded because we only generate the interpreter once.
But I’ll file that bug once this one is pushed.

>> Tested fastdebug and not-debug (calls itself “release”) builds w/ jtreg, fastdebug with PrintAsm enabled.
>> Did 64-hour leak check with KitchenSink; any leaks seem to be below the what’s-currently-compiled noise threshold.
>> Sanity check: is “optimized build” the default if I just run configure?
> No, the default is 'product' Hotspot build. I would suggest to build 'optimized' VM separately (it looks like 'optimized' target for whole forest does not work) and test it for leaks.

Done, and there appeared to be no leaks in CTW (not in “code”, which is where they showed up before).

Good to go?


More information about the hotspot-compiler-dev mailing list