Currently we have things called XPtr which are not what you get from ptr().
Old world:
handle->raw() returns RawObject* (tagged)
raw_obj->ptr() returns RawObject* (untagged)
After 6fe15f6df9:
handle->raw() returns ObjectPtr
obj_ptr->ptr() returns ObjectLayout*
New world:
handle->ptr() returns ObjectPtr
obj_ptr->untag() returns UntaggedObject*
TEST=ci
Change-Id: I6c7f34014cf20737607caaf84979838300d12df2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149367
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
As part of making the compiler and other subsystems independent
of `Isolate` we have to move various state from `Isolate` to
`IsolateGroup`.
The class_table and object_store were already moved to `IsolateGroup`.
This CL only replaces usages of `Isolate::{object_store,class_table}`
with the equivalent in `IsolateGroup`.
Issue https://github.com/dart-lang/sdk/issues/36097
TEST=Pure refactoring - relying on existing test coverage.
Change-Id: I34a0682d715b054d6c5faff077a513980f59a348
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/177126
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
This removes our temporary scaffolding support for JIT isolate groups
(which was implemented by creating a new isolate group, loading the
application kernel into it and then merging the heap into the original
isolate group - maintaining a different object store)
It makes all isolates within a group share the same object store, same
libraries and JITed code. It will be conservative to start with, only
allow running unoptimized code, etc.
We will gradually remove the restrictions imposed by this CL:
https://dart-review.googlesource.com/c/sdk/+/173970
Issue https://github.com/dart-lang/sdk/issues/36097
TEST=Tests using --enable-isolate-groups with JIT sharing.
Change-Id: I2bf69a6fe3c905067c4cec2e81613f731c52e5ee
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175302
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
Remove header access from typed data case in RawObject::HeapSizeFromClass.
Address data race between visiting remembered cards and allocating new large pages for promotion.
Change-Id: I92cc4604ed38ab8f42b87b140a26a8118e7030d4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142565
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>
This reverts commit 9209f522d6.
Reason for revert: Flaky analyzer crashes
Original change's description:
> [vm, gc] Parallel scavenge.
>
> Run N tasks that compete to copy or promote survivors. Installation of the forwarding pointer uses a CAS.
> Tasks do not share the list of copied objects to be processed.
> Tasks do share the list of promoted objects to be processed.
> Divide the freelist in N copies. Each scavenger task uses one without locking. The sweeper inserts into the freelists round-robin.
>
> Change-Id: I54c7839ac5f15829462b3be7cf8c9635c01b785f
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/135962
> Commit-Queue: Ryan Macnak <rmacnak@google.com>
> Reviewed-by: Martin Kustermann <kustermann@google.com>
TBR=kustermann@google.com,aam@google.com,rmacnak@google.com,asiva@google.com
Change-Id: I0d97b8d9148b2a81cabafde4602512e423eba223
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142554
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Run N tasks that compete to copy or promote survivors. Installation of the forwarding pointer uses a CAS.
Tasks do not share the list of copied objects to be processed.
Tasks do share the list of promoted objects to be processed.
Divide the freelist in N copies. Each scavenger task uses one without locking. The sweeper inserts into the freelists round-robin.
Change-Id: I54c7839ac5f15829462b3be7cf8c9635c01b785f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/135962
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Begin concurrent marking when available space in old-space is less than 5% or than the size of new-space, whichever comes first.
Avoids concurrent marking starting too late in larger heaps, where the program would exceed the hard threshold before concurrent marking would finish.
Change-Id: I6a1991331a1450ffa647bf0e21dfc19e82537268
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134466
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
This CL:
* Moves [Heap]/[SharedClassTable] from [Isolate] to [IsolateGroup], which
will make all isolates in the group use the same heap. The GC will use
the shared class table for object size information.
* Adds support for entering/leaving an isolate group as a helper thread
(e.g. via [Thread::EnterIsolateGroupAsHelper]). The current active
isolate group can be accessed via TLS `IsolateGroup::Current()` or
`Thread::isolate_group_`. When entering as a helper thread there will be
no current isolate.
* Changes the GC to use the above mechanism and ensures GC works without
a currently active isolate. The GC will use information purely available via
[IsolateGroup]. The GC will iterate all isolates within an isolate
group e.g. for scanning roots.
* Makes spawning of new isolates start in their own isolate group.
Once the isolate is fully functional it's heap will be merged into
the original isolate group
* Moves ApiState, containing persistent and weak persistent handles,
from [Isolate] to [IsolateGroup], plus adds appropriate locking.
Issue https://github.com/dart-lang/sdk/issues/36097
Change-Id: Ia8e1d8aa78750e8400864200f4825395a182c004
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/126646
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Previously large (>256k) typed arrays would be initialized 3 times:
- The OS initializing the new virtual memory to zero
- Object::InitializeObject initializing to object null
- TypedData::New reinitializing to zero
Change-Id: I432944919ab68aecb2038bba245594bbbaed9093
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/130928
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
In some workloads, the heap is mostly large pages.
Move large executable pages from the large list to the executable list. They do not require special treatment because they are large during sweeping because we never truncate an Instructions object. They still require being swept immediately because they are executable so that code protections can be flipped before resuming Dart execution.
Fix off-by-one errors in SnapshotGraph.objects and SnapshotClass.instances discovered as a result of the large page list changing from prepending to appending.
Bug: https://github.com/flutter/flutter/issues/48360
Change-Id: If6d9137fd36c9b18205493166d586b9a7cee4b1c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/130823
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
The VM does not include image pages in its usual accounting of heap usage and capacity because they are immortal and don't contribute to marking or sweeping work. The heap snapshot does include objects on these pages, so it should include the pages in its notion of usage and capacity, otherwise the heap-snapshot can effectively claim it has more usage than capacity.
Fixes negative fragmentation reported by the heap snapshot page.
Change-Id: Ib9f3c395ee5a6e51ee9b4c9a834843851426910d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128565
Reviewed-by: Siva Annamalai <asiva@google.com>
Reviewed-by: Ben Konyi <bkonyi@google.com>
Don't trigger an interrupt when concurrent marking finishes, which could trigger cause synchronous finalization in the middle of a frame; instead wait for the next allocation failure or idle notification.
Change-Id: I969c7e8de05ee1eb70103eda2df98cb2320085b8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/125082
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Allocate space for ForwardingPages when allocating a new HeapPages that is subject to compaction, instead of allocating it at compaction time, which is when we're already low on memory.
This has a 4KB/256KB = 1.5% overhead for ordinary pages, no overhead for large and code pages.
Bug: https://github.com/dart-lang/sdk/issues/37772
Change-Id: I9ce4d0791093df8ee98d9bda17f0a1cc33788e28
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/114020
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
In many cases, the Mutexes and Monitors have to be marked "mutable"
because they're used to synchronize const accessor methods.
Small text segment improvement for Product builds:
$ size dart.{arm,x64}.{before,after}
text data bss dec hex filename
19726069 409960 392332 20528361 1393ce9 dart.arm.before
19725525 409960 392332 20527817 1393ac9 dart.arm.after
22576021 600376 1782824 24959221 17cd8f5 dart.x64.before
22574821 600376 1782824 24958021 17cd445 dart.x64.after
Change-Id: I68f5cd5ad452044df8bfebd160910496036a3e6b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/101745
Commit-Queue: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Code collection interacts badly with
- warming up compiled code
- retaining pre-compiled code
- code coverage
- hot reload (deopting to an old version of a function)
Change-Id: Id269a6c3281e577d4f600f0c158af9e62f6b49ea
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99722
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Ryan Macnak