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List:       openjdk-serviceability-dev
Subject:    Integrated: 8331087: Move immutable nmethod data from CodeCache
From:       Vladimir Kozlov <kvn () openjdk ! org>
Date:       2024-04-29 16:02:17
Message-ID: L7Ie2phaKSEk-FxaOc4XYTy_q5yyPRGONvg2FqC0hrg=.df742515-d231-4521-81ba-04d3ead6fadb () github ! com
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On Fri, 26 Apr 2024 21:16:03 GMT, Vladimir Kozlov <kvn@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 <kvn@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


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