Commits on Nov 27, 2024

1. jvm: drop UseCompressedOops JVM option …

   Motivation:
   Starting java7, the UseCompressedOops is dynamically controed by heap
   size.
   
   ```
   $ java -Xmx32g -XX:+PrintFlagsFinal 2>/dev/null | grep UseCompressedOops
        bool UseCompressedOops                        = false                          {product lp64_product} {default}
   
   $ java -Xmx28g -XX:+PrintFlagsFinal 2>/dev/null | grep UseCompressedOops
        bool UseCompressedOops                        = true                           {product lp64_product} {ergonomic}
   ```
   
   The mismatch between UseCompressedOops endup with error:
   
   ```
   OpenJDK 64-Bit Server VM warning: Max heap size too large for Compressed Oops
   ***** WARNING! INCORRECT SYSTEM CONFIGURATION DETECTED! *****
   The system limit on number of memory mappings per process might be too low for the given
   [gc] max Java heap size (40960M). Please adjust /proc/sys/vm/max_map_count to allow for at
   [gc] least 73728 mappings (current limit is 65530). Continuing execution with the current
   ```
   
   Modification:
   drop UseCompressedOops JVM option from defaults.
   
   Result:
   correct behavior on JVMs with large heap
   
   Acked-by: Lea Morschel
   Target: master
   Require-book: no
   Require-notes: yes
   (cherry picked from commit 59ea69f)
   Signed-off-by: Tigran Mkrtchyan <[email protected]>

   

   kofemann committed Nov 27, 2024
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