RFR: 8231471: Obsolete -XX:CompilationPolicyChoice

[David Holmes]

Hi Claes,

This is the obsoletion step of removing the flag (where the flag is 
ignored and a warning issued), the actual removal of the flag happens in 
a future version so in arguments.cpp this:

+   { "CompilationPolicyChoice",       JDK_Version::jdk(13), 
JDK_Version::jdk(14), JDK_Version::jdk(14) },

should be:

+   { "CompilationPolicyChoice",       JDK_Version::jdk(13), 
JDK_Version::jdk(14), JDK_Version::jdk(15) },

and at the beginning of the JDK 15 cycle we will delete all such entries 
from the table.

Thanks,
David

On 26/09/2019 11:27 pm, Claes Redestad wrote:
> Hi,
> 
> CompilationPolicyChoice was deprecated in 13 with the goal of obsoleting
> it in 14.
> 
> Webrev: http://cr.openjdk.java.net/~redestad/8231471/webrev.00/
> Bug:    https://bugs.openjdk.java.net/browse/JDK-8231471
> 
> Since removing CompilationPolicyChoice makes it impossible to select and
> run the StackWalkCompPolicy I've removed that code, along with 2 develop
> flags only used by it.
> 
> StackWalkCompPolicy was the C2 default before 6, but abandoned in favor
> of the simpler C1 policy since it resulted in better startup and similar
> or better performance[1]. The choice to go back has remained as an
> undocumented options, and we've seen no reports of it being used.
> 
> Testing: tier1-3
> 
> Thanks!
> 
> /Claes