Request for review: 7022370 Launcher ergonomics doesn't need per-architecture implementations

[Kumar Srinivasan]

Looks good to me - approved.

Thanks
Kumar

> Hopefully all interested parties are addressed in the cc lists.
>
> webrev at:
>
> http://cr.openjdk.java.net/~dholmes/7022370/webrev/
>
> The launcher ergonomics (ergo.c) currently relies on per-architecture, 
> eg ergo_sparc.c, ergo_i586.c, files to define the actual ergonomics 
> operations. Only x86 is actually CPU specific, both sparc and zero 
> share the same platform independent implementation. It will simplify 
> things if we provide a platform independent default in ergo.c that is 
> conditionally compiled, and modify the build system to cause that 
> compilation if a platform specific ergo file is not found.
>
> We can potentially delete all the ergo_*.c files except for 
> ergo_i586.c, and we no longer require that there be a per-architecture 
> file, which makes additional porting easier.
>
> Gary: do you mind seeing ergo_zero.c go away, or would you prefer to 
> leave it in case someone is doing a local customization? I suppose the 
> some consideration could be given to ergo_sparc.c too. Is anybody 
> aware of downstream distros that modify these files to change the 
> default ergonomics policies?
>
> Thanks,
> David Holmes