| bbd695c71e0bf518f582e84524e1cdeb3de3896c |
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16-Apr-2014 |
Mathieu Chartier <mathieuc@google.com> |
Replace ObjectSet with LargeObjectBitmap.
Speeds up large object marking since large objects no longer required
a lock. Changed the GCs to use the heap bitmap for marking objects
which aren't in the fast path. This eliminates the need for a
MarkLargeObject function.
Maps before (10 GC iterations):
Mean partial time: 180ms
Mean sticky time: 151ms
Maps after:
Mean partial time: 161ms
Mean sticky time: 101ms
Note: the GC durations are long due to recent ergonomic changes and
because the fast bulk free hasn't yet been enabled. Over 50% of the
GC time is spent in RosAllocSpace::FreeList.
Bug: 13571028
Change-Id: Id8f94718aeaa13052672ccbae1e8edf77d653f62
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| a8e8f9c0a8e259a807d7b99a148d14104c24209d |
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09-Apr-2014 |
Mathieu Chartier <mathieuc@google.com> |
Refactor space bitmap to support different alignments.
Required for:
Using space bitmaps instead of std::set in mod union table +
remembered set.
Using a bitmap instead of set for large object marking.
Bug: 13571028
Change-Id: Id024e9563d4ca4278f79607cdb2f81895121b113
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| 83c8ee000d525017ead8753fce6bc1020249b96a |
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28-Jan-2014 |
Mathieu Chartier <mathieuc@google.com> |
Add root types and thread id to root visiting.
Enables us to pass the root type and thread id to hprof.
Bug: 12680863
Change-Id: I6a0f1f9e3aa8f9b4033d695818ae7ca3460d67cb
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| db7f37d57b6ac83abe6815d0cd5c50701b6be821 |
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10-Jan-2014 |
Mathieu Chartier <mathieuc@google.com> |
Refactor large object sweeping.
Moved basic sweeping logic into large_object_space.cc.
Renamed SpaceSetMap -> ObjectSet.
Change-Id: I938c1f29f69b0682350347da2bd5de021c0e0224
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| e6da9af8dfe0a3e3fbc2be700554f6478380e7b9 |
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16-Dec-2013 |
Mathieu Chartier <mathieuc@google.com> |
Background compaction support.
When the process state changes to a state which does not perceives
jank, we copy from the main free-list backed allocation space to
the bump pointer space and enable the semispace allocator.
When we transition back to foreground, we copy back to a free-list
backed space.
Create a seperate non-moving space which only holds non-movable
objects. This enables us to quickly wipe the current alloc space
(DlMalloc / RosAlloc) when we transition to background.
Added multiple alloc space support to the sticky mark sweep GC.
Added a -XX:BackgroundGC option which lets you specify
which GC to use for background apps. Passing in
-XX:BackgroundGC=SS makes the heap compact the heap for apps which
do not perceive jank.
Results:
Simple background foreground test:
0. Reboot phone, unlock.
1. Open browser, click on home.
2. Open calculator, click on home.
3. Open calendar, click on home.
4. Open camera, click on home.
5. Open clock, click on home.
6. adb shell dumpsys meminfo
PSS Normal ART:
Sample 1:
88468 kB: Dalvik
3188 kB: Dalvik Other
Sample 2:
81125 kB: Dalvik
3080 kB: Dalvik Other
PSS Dalvik:
Total PSS by category:
Sample 1:
81033 kB: Dalvik
27787 kB: Dalvik Other
Sample 2:
81901 kB: Dalvik
28869 kB: Dalvik Other
PSS ART + Background Compaction:
Sample 1:
71014 kB: Dalvik
1412 kB: Dalvik Other
Sample 2:
73859 kB: Dalvik
1400 kB: Dalvik Other
Dalvik other reduction can be explained by less deep allocation
stacks / less live bitmaps / less dirty cards.
TODO improvements: Recycle mem-maps which are unused in the current
state. Not hardcode 64 MB capacity of non movable space (avoid
returning linear alloc nightmares). Figure out ways to deal with low
virtual address memory problems.
Bug: 8981901
Change-Id: Ib235d03f45548ffc08a06b8ae57bf5bada49d6f3
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| 02e25119b15a6f619f17db99f5d05124a5807ff3 |
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15-Aug-2013 |
Mathieu Chartier <mathieuc@google.com> |
Fix up TODO: c++0x, update cpplint.
Needed to update cpplint to handle const auto.
Fixed a few cpplint errors that were being missed before.
Replaced most of the TODO c++0x with ranged based loops. Loops which
do not have a descriptive container name have a concrete type instead
of auto.
Change-Id: Id7cc0f27030f56057c544e94277300b3f298c9c5
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| 0a9dc05e704bfd033bac2aa38a4fc6f6b8e6cf93 |
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25-Jul-2013 |
Mathieu Chartier <mathieuc@google.com> |
GC data structures allocation tracking
Adds a new stl compatible allocator that is used in most GC data
structures. When the data structures allocate and free memory, it
lets the heap know of how much memory was allocated or freed. Using
this info, we dump the approximated stl data structures memory usage
when a sigquit occurs.
The allocation tracking can be disabled with a compile time boolean
flag to remove performance impact.
Change-Id: Idddb6713169e07be913bceeb50f305c8573e4392
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| 7940e44f4517de5e2634a7e07d58d0fb26160513 |
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12-Jul-2013 |
Brian Carlstrom <bdc@google.com> |
Create separate Android.mk for main build targets
The runtime, compiler, dex2oat, and oatdump now are in seperate trees
to prevent dependency creep. They can now be individually built
without rebuilding the rest of the art projects. dalvikvm and jdwpspy
were already this way. Builds in the art directory should behave as
before, building everything including tests.
Change-Id: Ic6b1151e5ed0f823c3dd301afd2b13eb2d8feb81
|