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Bug: 260881207
Test: presubmit
Test: abtd app_compat_drm
Test: abtd app_compat_top_100
Test: abtd app_compat_banking
Change-Id: I0a3d7b31dbe87e78ddf663b0914829913d3d3021
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In case of userfaultfd, we were setting declaring_class_ of all
ArtMethods to nullptr. This could cause problem if a GC is taking place
simultaneously and it is visiting the ArtMethod array at the same time.
Instead, we should convert the array to a 'no gc-root array' so that
compaction code skips it. The marking-phase will simply skips it as it
will no longer be pointed by the class.
Bug: 301880194
Test: test infra
Change-Id: I72007dd94ad71aa9ccc6005eb6d99b5a8c1ad7ee
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Userfaultfd tends to dirty all the pages of the space it is used on.
However, we want to maintain the shared-clean trait of the pages
allocated in zygote process prior to first fork.
This CL separates the pre-zygote fork arenas from the userfaultfd
visited ones, thereby reataining the former's shared-clean trait.
Bug: 160737021
Test: module install and enable uffd GC
Change-Id: Iddffb2c8d2d234ce7b20c069d86341dda5443a9b
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Additionally also uses userfaultfd's minor-fault feature for moving
space.
Bug: 160737021
Test: ART_USE_READ_BARRIER=false art/test/testrunner/testrunner.py and module install
Change-Id: I98b0c69fba4aec1263b1f38cc9f31494fd5c8cf5
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This CL enables updating native GC-roots during compaction page by
page. It does so by using a single-space linear allocator for allocating
ArtMethods/ArtFields/DexCache etc. and using a per-object header to
describe the kind of object/array and its size. Under the hood it still
uses arena allocator but the arenas are page-aligned regions taken from
a single-space.
This allows us in a future CL to use userfaultfd to protect this space
during the compaction pause and then concurrently update the pages
independently.
Bug: 160737021
Test: ART_USE_READ_BARRIER art/test/testrunner/testrunner.py --host
Change-Id: Ie52243741360f6008feccec76117d34c77ab1dcf
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