review for 7029167: add support for conditional card marks
john.r.rose at oracle.com
Wed Mar 30 17:30:22 PDT 2011
Your comment mentions ldsb/ldub, but I think it is about ldsw/lduw.
(I think you'll get lduw from the LoadI, and whether that turns into a brnz depends on the vagaries of can_branch_register in sparc.ad.)
I spot-checked other places where card marks are processed in opto, and saw no problems.
On Mar 30, 2011, at 4:46 PM, Tom Rodriguez wrote:
> 7029167: add support for conditional card marks
> Repeated updates to the card table can be a source of contention on
> multiprocessor machines that can greatly inhibit scalability. This
> adds support in C2 for conditional card marks. Tested with jbb and
> CTW. At some point this should be turned on automatically when multi
> socket machines are detected but that's covered under another bug as
> is C1 support.
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