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

[zgu at redhat.com]

On Sat, 2019-02-02 at 08:38 -0500, zgu at redhat.com wrote:
> 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 

s/image/imagine

-Zhengyu

> 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
> > >