RFR 8202086 : Improve performance characteristics of sun.security.util.MemoryCache

[Ivan Gerasimov]

Hello!

This enhancement was generously contributed by Peter Levart [1]. The 
original webrev is found here [2].

The goal was to improve concurrent accessibility of the cache, while 
maintaining some additional limitations dictated by the spec.

Would you please help review this fix?

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8202086
WEBREV: http://cr.openjdk.java.net/~igerasim/8202086/00/webrev/

Thanks in advance!

[1] 
http://mail.openjdk.java.net/pipermail/security-dev/2017-November/016512.html 

[2] 
http://cr.openjdk.java.net/~plevart/jdk10-dev/8186628_ssl_session_cache_scalability/webrev.01/

-- 
With kind regards,
Ivan Gerasimov