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  1. JDK
  2. JDK-8280872

Reorder code cache segments to improve code density

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    • b17
    • aarch64

        To reduce far jumps, far calls and trampolines in segmented CodeCache of the size [128M, 248M) and equally sized profiled and non-profiled segments, we can put the non-nmethod segment in between the profiled and non-profiled segments.
        Doing this we will have the sizes of the combined segments (non-nmethod, profiled) and (non-nmethod, non-profiled) below 128M. So there is no need for far jumps, far calls and trampolines to the non-nmethod section. Also when we reposition the non-nmethod segment, in the segment on the left we can allocate space from the end to make everything close to each other.

          1. CodeHeap200MB.png
            CodeHeap200MB.png
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              bulasevich Boris Ulasevich
              eastigeevich Evgeny Astigeevich
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