Request review: 4360113: Evict nmethods when code cache gets full

[Vladimir Kozlov]

Eric Caspole wrote:
> 
> Could you send me a cmd line for trying CompileTheWorld? I don't think I 
> am doing it right, I tried:
> 
> $ time /home/ecaspole/jdk1.6.0_16/bin/java -XX:+CompileTheWorld 
> -XX:+PrintCompilation  -version
> VM option '+CompileTheWorld'
> VM option '+PrintCompilation'
> CompileTheWorld : Compiling all classes in 
> /home/ecaspole/jdk1.6.0_16/jre/lib/resources.jar

You need to specify .jar file you want to process, for example:

-Xbootclasspath/p:/home/ecaspole/jdk1.6.0_16/jre/lib/rt.jar

And eith -version VM will exit, use -showversion.

>> Actually, I don't understand why it is need to be atomic.
>> It is always one direction change:
>> compiler broker change it to "false" and
>> only sweeper (at safepoint) change it to "true".
> 
> What I was going for here is that when there are multiple compiler 
> threads, probably more than one will hit the full condition more at less 
> at once. I want to get the flag set and let me know if I actually set 
> it. If I won to set it, I will run the cleaning op, otherwise I will go 
> back and block and wait on the compile queue until the flag gets set 
> back to true.
> 

I see. I still want to use "1" instead of "true" for initialization
since in all places you use "1" or "0".

Vladimir