• Ulan Degenbaev's avatar
    [api] New v8::Isolate::MeasureMemory API with per-context sizes · 80242048
    Ulan Degenbaev authored
    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: 's avatarHannes Payer <hpayer@chromium.org>
    Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
    Reviewed-by: 's avatarDominik Inführ <dinfuehr@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#65856}
    80242048
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