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layout: Report memory usage for fragment and box trees. (#36553)

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Add memory reporter integration for the fragment and box trees that are
persisted in the layout thread.

Testing: Looked at the numbers for https://servo.org and
https://html.spec.whatwg.org/. The former was very small, but the latter
was 700mb.

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-04-18 16:05:15 -04:00 • committed by GitHub
parent add8c51f47
commit c787688afc
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33 changed files with 230 additions and 69 deletions
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3
components/layout_2020/fragment_tree/positioning_fragment.rs
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@ -4,6 +4,7 @@
use app_units::Au;
use base::print_tree::PrintTree;
use malloc_size_of_derive::MallocSizeOf;
use servo_arc::Arc as ServoArc;
use style::properties::ComputedValues;
@ -14,6 +15,7 @@ use crate::geom::PhysicalRect;
/// Can contain child fragments with relative coordinates, but does not contribute to painting
/// itself. [`PositioningFragment`]s may be completely anonymous, or just non-painting Fragments
/// generated by boxes.
#[derive(MallocSizeOf)]
pub(crate) struct PositioningFragment {
pub base: BaseFragment,
pub rect: PhysicalRect<Au>,
@ -22,6 +24,7 @@ pub(crate) struct PositioningFragment {
pub scrollable_overflow: PhysicalRect<Au>,
/// If this fragment was created with a style, the style of the fragment.
#[conditional_malloc_size_of]
pub style: Option<ServoArc<ComputedValues>>,
}