Reviewers: Hannes Payer,
Message:
PTAL. This relands parts of CL 794583003. The difference is that we retain
only
maps embedded in optimized code, which avoid maps space iteration.
Description:
Retain maps embedded in optimized code for several garbage collections.
This keeps dying maps alive for FLAG_retain_maps_for_n_gc garbage
collections
to increase chances of them being reused for new objects in future and
decrease number of deoptimizations.
BUG=v8:3664
LOG=N
TEST=cctest/test-heap/MapRetaining
Please review this at https://codereview.chromium.org/980523004/
Base URL: https://chromium.googlesource.com/v8/v8.git@master
Affected files (+255, -2 lines):
M include/v8.h
M src/flag-definitions.h
M src/heap/heap.h
M src/heap/heap.cc
M src/heap/mark-compact.h
M src/heap/mark-compact.cc
M src/lithium.cc
M src/objects.h
M src/objects.cc
M src/objects-inl.h
M test/cctest/cctest.gyp
M test/cctest/test-api.cc
A test/cctest/test-array-list.cc
M test/cctest/test-heap.cc
M test/cctest/test-mark-compact.cc
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