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Reduce allocations in layout_block_level_children_in_parallel (#35781)

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This function showed up as a top producer of allocations
(around 10% of all allocations).
Allocating the vector once upfront and using
`collect_into_vec` removes any intermediate allocations.
This approach is also recommended by the rayon documentation:
https://docs.rs/rayon/1.10.0/rayon/iter/trait.ParallelIterator.html#method.collect

Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
This commit is contained in:
Jonathan Schwender 2025-03-04 08:48:12 +01:00 • committed by GitHub
parent f594691af9
commit 5533092ab3
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1 changed files with 6 additions and 3 deletions
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9
components/layout_2020/flow/mod.rs
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@ -7,7 +7,7 @@
use app_units::{Au, MAX_AU};
use inline::InlineFormattingContext;
use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
use rayon::iter::{IndexedParallelIterator, IntoParallelRefIterator, ParallelIterator};
use servo_arc::Arc;
use style::Zero;
use style::computed_values::clear::T as StyleClear;
@ -662,7 +662,10 @@ fn layout_block_level_children_in_parallel(
) -> Vec<Fragment> {
let collects_for_nearest_positioned_ancestor =
positioning_context.collects_for_nearest_positioned_ancestor();
let layout_results: Vec<(Fragment, PositioningContext)> = child_boxes
let mut layout_results: Vec<(Fragment, PositioningContext)> =
Vec::with_capacity(child_boxes.len());
child_boxes
.par_iter()
.map(|child_box| {
let mut child_positioning_context =
@ -676,7 +679,7 @@ fn layout_block_level_children_in_parallel(
);
(fragment, child_positioning_context)
})
.collect();
.collect_into_vec(&mut layout_results);
layout_results
.into_iter()