[jdk17u-dev] RFR: 8292989: Avoid dynamic memory in AsyncLogWriter [v2]

[Xin Liu]

On Fri, 4 Aug 2023 19:40:10 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> This patch is *NOT* a clean backport.  The logic part is exactly the same, but I have to adjust code in the following parts:
>> 1. change from KVHashtable to ResourceHashtable because we want to use resourceArea instead of C_HEAP. 
>> 2. rewrite lambda expression using Functor. 
>> 
>> Testing: 
>> jdk-test1 tests including gtest. 
>> Manually check there's no malloc/free in runtime.
>
> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert resourceHash.hpp and use functor instead of C++ lambda.

Hi, Thomas, 

Thanks you for the comments. I was told that it is better reducing memory footprint of UL in jdk17u, a LTS Java. May I learn more about glibc autotrim? Is it a glibc feature or a new feature of hotspot? 

I found [JDK-8268893](https://bugs.openjdk.org/browse/JDK-8268893) on JBS. It itself is a very useful feature! It is not an automatic trimmer, is it?

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PR Comment: https://git.openjdk.org/jdk17u-dev/pull/1630#issuecomment-1667216510