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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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10
components/layout_2020/flow/mod.rs
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@ -7,6 +7,7 @@
use app_units::{Au, MAX_AU};
use inline::InlineFormattingContext;
use malloc_size_of_derive::MallocSizeOf;
use rayon::iter::{IndexedParallelIterator, IntoParallelRefIterator, ParallelIterator};
use servo_arc::Arc;
use style::Zero;
@ -53,13 +54,13 @@ mod root;
pub(crate) use construct::BlockContainerBuilder;
pub use root::{BoxTree, CanvasBackground};
#[derive(Debug)]
#[derive(Debug, MallocSizeOf)]
pub(crate) struct BlockFormattingContext {
pub contents: BlockContainer,
pub contains_floats: bool,
}
#[derive(Debug)]
#[derive(Debug, MallocSizeOf)]
pub(crate) enum BlockContainer {
BlockLevelBoxes(Vec<ArcRefCell<BlockLevelBox>>),
InlineFormattingContext(InlineFormattingContext),
@ -76,7 +77,7 @@ impl BlockContainer {
}
}
#[derive(Debug)]
#[derive(Debug, MallocSizeOf)]
pub(crate) enum BlockLevelBox {
Independent(IndependentFormattingContext),
OutOfFlowAbsolutelyPositionedBox(ArcRefCell<AbsolutelyPositionedBox>),
@ -246,8 +247,9 @@ pub(crate) struct CollapsibleWithParentStartMargin(bool);
/// The contentes of a BlockContainer created to render a list marker
/// for a list that has `list-style-position: outside`.
#[derive(Debug)]
#[derive(Debug, MallocSizeOf)]
pub(crate) struct OutsideMarker {
#[conditional_malloc_size_of]
pub list_item_style: Arc<ComputedValues>,
pub base: LayoutBoxBase,
pub block_container: BlockContainer,