RFR(XL): 8185640: Thread-local handshakes
aph at redhat.com
Wed Oct 25 15:16:40 UTC 2017
On 24/10/17 15:54, Robbin Ehn wrote:
> I did a fix for the interpreter performance regression, it's plain and simple, I
> kept the polling code inside dispatch_base but made it optional as the verify oop.
> Manual tested with jstack and it passes: hotspot_tier1, hotspot_handshake
> It reduces the polling cost of 80%, sensitive benchmarks shows -0.44% regression
> vs TLH off. More insensitive benchmark show no regression.
I think it's not quite right: you're missing a check in tableswitch
and fast_linearswitch. These can be used to construct loops.
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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