This adds a new API function that can be customized by the embedder
by providing a delegate that defines contexts to be measured and
reports the results to JS.
A memory measurement request is carried out as follows:
1) MeasureMemory(delegate) invocation enqueues a new request in
MemoryMeasurement::received_ and schedules a delayed GC task.
2) At the start of the next GC (that is triggered either by the
GC schedule or by the delayed task) each request in received_
moves to processing_. Per-context marking worklists are created
for each native context that was selected by the delegates
(using the ShouldMeasure predicate).
3) At the end of the GC the sizes of the native contexts are
recorded for each request in processing_. The requests move
to the done_ list and result reporting task is scheduled.
4) When the result reporting task runs it invokes the
MeasurementComplete function of each delegate in done_.
Bug: chromium:973627
Change-Id: I0254cae693c5b8fab7c85a9eca0a3a128210b6c4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1981493
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65856}
This adds inference for general JSObjects to NativeContextInferrer in
the case when the object is going to be attributed to the shard context.
Bug: chromium:973627
Change-Id: I393e8dd16a1f8b615fb2f8dceb52f543bae33554
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1997133
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65736}
This changes the marking worklist draining for the main thread
marker and the concurrent marker to use the following algorithm in
per-context mode:
1) Pop an object from the marking worklist.
2) Try to infer the native context that owns the objects.
This is done using a new NativeContextInferrer class.
3) If the inference is successful, then change the active marking
worklist to the worklist of the inferred native context.
4) Otherwise, keep the current active marking worklist.
5) Visit the object. Newly discovered objects will be pushed
onto the active marking worklist.
6) Account the object size for the native context corresponding
to the active marking worklist.
This is done using a new NativeContextStats class.
The main property of the algorithm is that each object for which
we couldn't infer the native context is either attributed to
the native context retaining it or is not attributed to any native
context.
Bug: chromium:973627
Change-Id: Ide4ab992275d115279f971d89ace657f4c05e176
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1981491
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65663}
