Commits on Nov 1, 2024

1. Implement initial RAM class persistence feature …

   With the motivation of reducing startup time, this patch implements
   initial support for a mechanism to persist RAM classes to disk during
   a training run and load the persisted snapshot on subsequent
   identical production runs.
   
   Towards this goal, this patch:
   - Identifies an -Xsnapshot= command-line option that enables the
     snapshotting functionality and takes a string parameter that
     specifies a file path where the snapshot image is/will be.
   - Adds SnapshotFileFormat.h file that specifies the format of the
     snapshot image that is persisted to disk. It describes the J9JavaVM
     members that are supported, namely immortal J9ClassLoader objects
     and the J9Class objects that they load.
   - Adds the VMSnapshotImpl files that specify and implement the
     snapshotting API and include suballocators wherein the data to include
     within a snapshot is allocated.
   - Ensures correct allocation/initialization of the immortal J9ClassLoaders
     and memory segments snapshotting and restoring.
   - Enables taking a snapshot on VM shutdown, and restoring during startup.
   
   Co-authored-by: Tobi Ajila <[email protected]>
   Co-authored-by: Babneet Singh <[email protected]>
   Co-authored-by: Nathan Henderson <[email protected]>
   Signed-off-by: Nathan Henderson <[email protected]>

   

   4 people committed Nov 1, 2024
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