RFR 8197518: Kerberos krb5 authentication: AuthList's put method leads to performance issue

[Weijun Wang]

You mean I can save it somewhere and only update it when a cleanup is performed?

This should be better. Now there will be only isEmpty(), getFirst() and addFirst(), and one less getLast().

Thanks
Max

> On Feb 23, 2018, at 1:45 AM, Xuelei Fan <xuelei.fan at oracle.com> wrote:
> 
> Looks like list synchronization is a factor of the performance impact. Maybe, you can have a private time for the oldest entry so don't access/iterate/cleanup entries list until necessary.  The "at most every minute" may be not a good strategy in some situations.
> 
> Xuelei
> 
> On 2/22/2018 12:36 AM, Weijun Wang wrote:
>> Please take a review at
>>    http://cr.openjdk.java.net/~weijun/8197518/webrev.00/
>> Two notes:
>> 1. I tried list.subList(here, end).clear() but it's not faster.
>> 2. I have looked at ConcurrentHashMap + ConcurrentSkipListMap but will need more time to verify its correctness and measure the performance gain. Since the bug is reported on 8u, a safer fix looks better.
>> Noreg-perf.
>> Thanks
>> Max