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| author | 2022-11-30 06:45:28 +0000 | |
|---|---|---|
| committer | 2022-12-05 18:17:40 +0000 | |
| commit | 49f034785005e53ca51d2af7985e41e4be3d802d (patch) | |
| tree | 6961a925bcfdf1a89fa2b22201a7bdd16bff70a7 /runtime/linear_alloc.h | |
| parent | 5ac8b698c560e631b0a0e38aaed1445d488da826 (diff) | |
Maintain pre-zygote fork linear-alloc pages as shared-clean
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
Diffstat (limited to 'runtime/linear_alloc.h')
| -rw-r--r-- | runtime/linear_alloc.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/runtime/linear_alloc.h b/runtime/linear_alloc.h index ad1e349632..c40af8ad46 100644 --- a/runtime/linear_alloc.h +++ b/runtime/linear_alloc.h @@ -90,6 +90,9 @@ class LinearAlloc { size_t GetUsedMemory() const REQUIRES(!lock_); ArenaPool* GetArenaPool() REQUIRES(!lock_); + // Force arena allocator to ask for a new arena on next allocation. This + // is to preserve private/shared clean pages across zygote fork. + void SetupForPostZygoteFork(Thread* self) REQUIRES(!lock_); // Return true if the linear alloc contains an address. bool Contains(void* ptr) const REQUIRES(!lock_); |