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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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6
components/layout_2020/layout_box_base.rs
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@ -6,6 +6,7 @@ use std::fmt::{Debug, Formatter};
use app_units::Au;
use atomic_refcell::AtomicRefCell;
use malloc_size_of_derive::MallocSizeOf;
use servo_arc::Arc;
use style::properties::ComputedValues;
@ -23,8 +24,10 @@ use crate::{ConstraintSpace, ContainingBlockSize};
/// passes.
///
/// In the future, this will hold layout results to support incremental layout.
#[derive(MallocSizeOf)]
pub(crate) struct LayoutBoxBase {
pub base_fragment_info: BaseFragmentInfo,
#[conditional_malloc_size_of]
pub style: Arc<ComputedValues>,
pub cached_inline_content_size:
AtomicRefCell<Option<Box<(SizeConstraint, InlineContentSizesResult)>>>,
@ -95,7 +98,7 @@ impl Debug for LayoutBoxBase {
}
}
#[derive(Clone)]
#[derive(Clone, MallocSizeOf)]
pub(crate) struct CacheableLayoutResult {
pub fragments: Vec<Fragment>,
@ -124,6 +127,7 @@ pub(crate) struct CacheableLayoutResult {
}
/// A collection of layout inputs and a cached layout result for a [`LayoutBoxBase`].
#[derive(MallocSizeOf)]
pub(crate) struct CacheableLayoutResultAndInputs {
/// The [`CacheableLayoutResult`] for this layout.
pub result: CacheableLayoutResult,