• Michael Achenbach's avatar
    Revert "[heap] Move initial objects into RO_SPACE" · 223e0088
    Michael Achenbach authored
    This reverts commit f8ae62fe.
    
    Reason for revert:
    https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20internal%20snapshot/builds/14825
    
    Original change's description:
    > [heap] Move initial objects into RO_SPACE
    > 
    > This moves:
    > * the main oddballs (null, undefined, hole, true, false) as well as
    > their supporting maps (also adds hole as an internalized string to make
    > this work).
    > * most of the internalized strings
    > * the struct maps
    > * empty array
    > * empty enum cache
    > * the contents of the initial string table
    > * the weak_cell_cache for any map in RO_SPACE (and eagerly creates the
    > value avoid writing to it during run-time)
    > 
    > The StartupSerializer stats change as follows:
    > 
    >      RO_SPACE  NEW_SPACE  OLD_SPACE  CODE_SPACE  MAP_SPACE  LO_SPACE
    > old         0          0     270264       32608      12144         0
    > new     21776          0     253168       32608       8184         0
    > Overall memory usage has increased by 720 bytes due to the eager
    > initialization of the Map weak cell caches.
    > 
    > Also extends --serialization-statistics to print out separate instance
    > type stats for objects in RO_SPACE as shown here:
    > 
    >   Read Only Instance types (count and bytes):
    >        404      16736  ONE_BYTE_INTERNALIZED_STRING_TYPE
    >          2         32  HEAP_NUMBER_TYPE
    >          5        240  ODDBALL_TYPE
    >         45       3960  MAP_TYPE
    >          1         16  BYTE_ARRAY_TYPE
    >          1         24  TUPLE2_TYPE
    >          1         16  FIXED_ARRAY_TYPE
    >          1         32  DESCRIPTOR_ARRAY_TYPE
    >         45        720  WEAK_CELL_TYPE
    > 
    > Bug: v8:7464
    > Change-Id: I12981c39c82a7057f68bbbe03f89fb57b0b4c6a6
    > Reviewed-on: https://chromium-review.googlesource.com/973722
    > Commit-Queue: Dan Elphick <delphick@chromium.org>
    > Reviewed-by: Hannes Payer <hpayer@chromium.org>
    > Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
    > Reviewed-by: Yang Guo <yangguo@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#52435}
    
    TBR=rmcilroy@chromium.org,yangguo@chromium.org,hpayer@chromium.org,mlippautz@chromium.org,delphick@chromium.org
    
    Change-Id: Ie62a73a5be3b21a15bb46e342acb3e808fbaa4f3
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Bug: v8:7464
    Reviewed-on: https://chromium-review.googlesource.com/999653Reviewed-by: 's avatarMichael Achenbach <machenbach@chromium.org>
    Commit-Queue: Michael Achenbach <machenbach@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#52440}
    223e0088
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