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

[zgu at redhat.com]

On Wed, 2019-02-06 at 15:48 +0100, Aleksey Shipilev wrote:
> On 2/6/19 3:34 PM, zgu at redhat.com wrote:
> > > *) In src/hotspot/share/gc/shared/threadLocalAllocBuffer.hpp, why
> > > this whole thing is removed? I
> > > would expect "just" the rename of slow_refill_waste() to
> > > refill_waste() and removing
> > > fast_refill_waste() here, leaving everything else untouched.
> > > 
> > >  105   // statistics
> > >  106
> > >  107   int number_of_refills() const { return _number_of_refills;
> > > }
> > >  108   int fast_refill_waste() const { return _fast_refill_waste;
> > > }
> > >  109   int slow_refill_waste() const { return _slow_refill_waste;
> > > }
> > >  110   int gc_waste() const          { return _gc_waste; }
> > >  111   int slow_allocations() const  { return _slow_allocations;
> > > }
> > >  112
> > 
> > They are dead code. Do they worth for another cleanup RFE for the
> > trivial cleanup?
> 
> Okay. I thought the patch was about fast refills only. But indeed, we
> can clean these unused
> definitions in the same patch. On one hand, removing trivial unused
> getters would require us to add
> them back when they are needed. On the other hand, it seems that TLAB
> does every statistic
> internally, and we should instead force callers to use higher-level
> TLAB methods to access and
> interpret them.
> 
> Code looks good! I think we still need Serviceability to acknowledge
> this is okay to do.

Serguei okayed.

Serguei, does it still okay with you?

Thanks,

-Zhengyu

> 
> -Aleksey
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