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constellation: Use FnvHashMap for hashmaps that use ids as keys (#39106)

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FNV is faster for hashing less than 16 bytes of data and the
cryptographic properties of the default HashMap are not needed for the
various ids.

Testing: This does not change functionality.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>
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Narfinger 2025-09-03 20:15:19 +02:00 • committed by GitHub
parent 0ae9ee28d5
commit 5c7ea4bdee
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19 changed files with 71 additions and 54 deletions
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9
components/shared/constellation/lib.rs
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@ -11,7 +11,7 @@
mod from_script_message;
mod structured_data;
use std::collections::{HashMap, VecDeque};
use std::collections::VecDeque;
use std::fmt;
use std::time::Duration;
@ -22,6 +22,7 @@ use embedder_traits::{
CompositorHitTestResult, FocusId, InputEvent, JavaScriptEvaluationId, MediaSessionActionType,
Theme, TraversalId, ViewportDetails, WebDriverCommandMsg, WebDriverCommandResponse,
};
use fnv::FnvHashMap;
pub use from_script_message::*;
use ipc_channel::ipc::IpcSender;
use malloc_size_of_derive::MallocSizeOf;
@ -41,7 +42,7 @@ pub enum EmbedderToConstellationMessage {
/// Exit the constellation.
Exit,
/// Query the constellation to see if the current compositor output is stable
IsReadyToSaveImage(HashMap<PipelineId, Epoch>),
IsReadyToSaveImage(FnvHashMap<PipelineId, Epoch>),
/// Whether to allow script to navigate.
AllowNavigationResponse(PipelineId, bool),
/// Request to load a page.
@ -94,7 +95,7 @@ pub enum EmbedderToConstellationMessage {
SetWebViewThrottled(WebViewId, bool),
/// The Servo renderer scrolled and is updating the scroll states of the nodes in the
/// given pipeline via the constellation.
SetScrollStates(PipelineId, HashMap<ExternalScrollId, LayoutVector2D>),
SetScrollStates(PipelineId, FnvHashMap<ExternalScrollId, LayoutVector2D>),
/// Notify the constellation that a particular paint metric event has happened for the given pipeline.
PaintMetric(PipelineId, PaintMetricEvent),
/// Evaluate a JavaScript string in the context of a `WebView`. When execution is complete or an
@ -180,7 +181,7 @@ pub struct PortTransferInfo {
#[allow(clippy::large_enum_variant)]
pub enum MessagePortMsg {
/// Complete the transfer for a batch of ports.
CompleteTransfer(HashMap<MessagePortId, PortTransferInfo>),
CompleteTransfer(FnvHashMap<MessagePortId, PortTransferInfo>),
/// Complete the transfer of a single port,
/// whose transfer was pending because it had been requested
/// while a previous failed transfer was being rolled-back.