RFR: 8178836: Improve PtrQueue index abstraction

[Aleksey Shipilev]

On 04/19/2017 09:05 PM, Kim Barrett wrote:
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8178836/hotspot.00/

Looks nice.

Minor nits:

*) On first scan, "limit" reads as the loop variable, because it is the only
initialization in init block. Move it out?

 161   for (size_t limit = buffer_size(); i < limit; ++i) {

*) Is there a Unified Logging tag for these?

 185   tty->print_cr("  SATB BUFFER [%s] buf: ...

Thanks,
-Aleksey

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