RFR(S) 8212127: Cleanup TLAB fast refill statistics, perf counters and etc.

[zgu at redhat.com]

On Sat, 2019-02-02 at 11:01 +1000, David Holmes wrote:
> On 2/02/2019 4:27 am, zgu at redhat.com wrote:
> > After FastTLABRefill was removed, let's cleanup related perf
> > counters.
> > I removed perf counters for fast refill, and renamed perf counters
> > for
> > slow refill.
> > 
> > I am not all clear what implication of renaming/removing exported
> > symbols, and have no idea what aliasmap is for. So I ran all tests
> > I
> > think could be affected, showed no problem.
> 
> Will need to check how perfcounters may be accessed before removing 
> them. I don't know if external tools may access them as jvmstat does.
Yep, but It is hard to find out. I can not image this is the first one,
how we dealt with before?

Removing "_reserve_for_allocation_prefetch" breaks JDK8 tools, how it
was communicated?

Thanks,

-Zhengyu 


> 
> David
> -----
> 
> > 
> > Bug: https://bugs.openjdk.java.net/browse/JDK-8212127
> > Webrev: http://cr.openjdk.java.net/~zgu/JDK-8212127/webrev.00/
> > 
> > Test:
> >    hotspot_runtime, hotspot_serviceability,
> > vmTestbase_nsk_monitoring,
> >    vmTestbase_nsk_jdi, vmTestbase_nsk_jvmti, vmTestbase_vm_jdwp
> >    on Linux x64
> > 
> >    Eyeball output of jsnap
> > 
> > Thanks,
> > 
> > -Zhengyu
> >