RFR (S) 7187999: dtrace jstack action is broken

[Dmitry Samersoff]

Serguei,

Looks good for me.

Could you put comments below into makefile?

-Dmitry

On 2014-08-01 04:29, serguei.spitsyn at oracle.com wrote:
> Please, review the fix for:
>   https://bugs.openjdk.java.net/browse/JDK-7187999
> 
> 
> Open webrev:
> http://cr.openjdk.java.net/~sspitsyn/webrevs/2014/hotspot/7187999-dtrace.1
> 
> 
> Summary:
> 
>   The DTrace jstack action support was broken for several years.
>   The issue came when the build flag -Xlazyload was added by request
> from the Solaris team.
>   This flag was necessary to resolve a performance issue.
>   The jstack action stopped working as the jhelper.d was loaded lazily
> as well.
> 
>   The idea of this fix was suggested by Junsang Cho from the Solaris team.
>   The jhelper.d and hotspot probes (other USDT scripts) are separated
> into two different SUNW_DOF sections.
>   Now the jhelper.d is built without the -Xlazyload flag.
> 
> Testing:
>   Running the adhoc dtrace tests on Solaris sparcv9 and amd64
> 
> 
> Thanks,
> Serguei


-- 
Dmitry Samersoff
Oracle Java development team, Saint Petersburg, Russia
* I would love to change the world, but they won't give me the sources.