RFR(S) 8240205: Avoid PackageEntry lookup when loading shared classes

[Calvin Cheung]

Hi Claes,

Thanks for your review!

Calvin

On 4/3/20 1:06 AM, Claes Redestad wrote:
> Looks good to me!
>
> /Claes
>
> On 2020-04-03 02:58, Calvin Cheung wrote:
>> RFE: https://bugs.openjdk.java.net/browse/JDK-8240205
>> webrev: http://cr.openjdk.java.net/~ccheung/jdk15/8240205/webrev.00/
>>
>> During loading of a shared class from a CDS archive, the PackageEntry 
>> is being looked up in several places within the same call stack. This 
>> RFE is to do the PackageEntry lookup at one place and then pass it 
>> along to the subsequently called functions which need it.
>>
>> Perf improvement on loading approx. 2000 classes on linux:
>>
>> instr delta = -17930620 -0.6155%
>> time delta = -6.311 ms -0.7516%
>>
>> Passed tiers1 - 4 testing.
>>
>> thanks,
>>
>> Calvin
>>
>>