On Fri, 26 Apr 2024 21:16:03 GMT, Vladimir Kozlov <k...@openjdk.org> wrote:
> Move immutable nmethod's data from CodeCache to C heap. It includes > `dependencies, nul_chk_table, handler_table, scopes_pcs, scopes_data, > speculations`. It amounts for about 30% (optimized VM) of space in CodeCache. > > Use HotSpot's `os::malloc()` to allocate memory in C heap for immutable > nmethod's data. Call `vm_exit_out_of_memory()` if allocation failed. > > Shuffle fields order and change some fields size from 4 to 2 bytes to avoid > nmethod's header size increase. > > Tested tier1-5, stress,xcomp > > Our performance testing does not show difference. > > Example of updated `-XX:+PrintNMethodStatistics` output is in JBS comment. This pull request has now been integrated. Changeset: bdcc2400 Author: Vladimir Kozlov <k...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/bdcc2400db63e604d76f9b5bd3c876271743f69f Stats: 311 lines in 5 files changed: 163 ins; 42 del; 106 mod 8331087: Move immutable nmethod data from CodeCache Reviewed-by: thartmann, dlong, dnsimon ------------- PR: https://git.openjdk.org/jdk/pull/18984
