Review request: exports runtime support + jdk modules converted to use exports

[Alan Bateman]

Mandy Chung wrote:
> An update on the analysis:
>
> I instrumented the simple library. This single context's name itself
> takes up 80% of the config file size (~75M).
>
> +jdk.boot+sun.charsets+sun.compat+sun.corba+sun.desktop+sun.ext+sun.instrument+sun.jaas+sun.jaxp+sun.jdbc+sun.jndi+sun.jsse+sun.jta+sun.kerberos+sun.localedata+sun.logging+sun.management+sun.resources+sun.rmi+sun.security.acl+sun.sunec 
>
>
> count  per-string bytes total bytes
> 327099     235          76868265
>
> Each context contains a map from a remote class name to a context's name.
> When the map's key is changed from package name to a class name, the
> number of context's name is thus significantly increased.  A simple
> fix would be using an integer as the context ID and storing the name
> only once.
>
> Top 15 strings with the highest total of bytes in the config file:
> count   bytes    total  contexts name
> 327099    235 76868265   41     
> +jdk.boot+sun.charsets+sun.compat+sun.corba+sun.desktop+sun.ext+sun.instrument+sun.jaas+sun.jaxp+sun.jdbc+sun.jndi+sun.jsse+sun.jta+sun.kerberos+sun.localedata+sun.logging+sun.management+sun.resources+sun.rmi+sun.security.acl+sun.sunec 
>
>   5550     16    88800    1     sun.desktop at 7-ea
>   4121     10    41210   11     +jdk.javac
>   3722     10    37220    6     +sun.jaxws
>   3467     13    45071    1     jdk.boot at 7-ea
>   3325     14    46550    1     jdk.tools at 7-ea
>   2502     13    32526    1     sun.jaxp at 7-ea
>   2405     14    33670    1     sun.jaxws at 7-ea
>   1677     14    23478    1     sun.corba at 7-ea
>   1441     20    28820    1     jdk.tools.jaxws at 7-ea
>    801     13    10413    9     +jdk.compiler
>    768     14    10752    1     jdk.javac at 7-ea
>    558     19    10602    1     sun.management at 7-ea
>
> Total number of strings in the config file is 729694 but 26185
> unique strings. Total bytes occupied by these strings is 91839030.
>
> The strings created in the configuration includes
>    context's name
>    module's name at version
>    module library path
>    class name
>
> There is other opportunity for optimization.  For example, for each class
> from jdk.boot, there are 40 copies in the config as one in each remote 
> map
> of each context and there are 40 contexts requiring it.
>
> Mandy
>
For the current problem then adding indirection for the context name 
should do it. If you are anxious to get the exports work completed then 
this could be separated from other optimization work.

-Alan