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| author | Mathieu Chartier <mathieuc@google.com> | 2014-06-10 11:22:31 -0700 |
|---|---|---|
| committer | Mathieu Chartier <mathieuc@google.com> | 2014-06-19 12:57:05 -0700 |
| commit | 52e4b43d62896b56f8c2bd041e528472bb4a0d8d (patch) | |
| tree | 3a9367c391418c1375a6c86f678b3f047cacc03f /runtime/globals.h | |
| parent | ef38670cae8462d579da983c1863f96717cccee6 (diff) | |
| download | art-52e4b43d62896b56f8c2bd041e528472bb4a0d8d.zip art-52e4b43d62896b56f8c2bd041e528472bb4a0d8d.tar.gz art-52e4b43d62896b56f8c2bd041e528472bb4a0d8d.tar.bz2 | |
Add mark compact collector.
The mark compact collector is a 4 phase collection, doing a normal
full mark_sweep, calculating forwarding addresses of objects in the
from space, updating references of objects in the from space, and
moving the objects in the from space.
Support is diabled by default since it needs to have non movable
classes and field arrays. Performance numbers is around 50% as fast.
The main advantage that this has over semispace is that the worst
case memory usage is 50% since we only need one space isntead of two.
TODO: Make field arrays and classes movable. This causes complication
since Object::VisitReferences relies on these, so if we update the
fields of an object but another future object uses this object to
figure out what fields are reference fields it doesn't work.
Bug: 14059466
Change-Id: I661ed3b71ad4dde124ef80312c95696b4a5665a1
Diffstat (limited to 'runtime/globals.h')
| -rw-r--r-- | runtime/globals.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/runtime/globals.h b/runtime/globals.h index 58c2118..3a906f1 100644 --- a/runtime/globals.h +++ b/runtime/globals.h @@ -74,8 +74,11 @@ static constexpr bool kUsePortableCompiler = false; // Garbage collector constants. static constexpr bool kMovingCollector = true && !kUsePortableCompiler; +static constexpr bool kMarkCompactSupport = false && kMovingCollector; +// True if we allow moving field arrays, this can cause complication with mark compact. +static constexpr bool kMoveFieldArrays = !kMarkCompactSupport; // True if we allow moving classes. -static constexpr bool kMovingClasses = true; +static constexpr bool kMovingClasses = !kMarkCompactSupport; // True if we allow moving fields. static constexpr bool kMovingFields = false; // True if we allow moving methods. |