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Remove parallel display list construction

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Parallel display list construction hasn't been shown to give any
performance gains. It is also incompatible with the current flat display
list implementation. Once flat display lists have landed, we can explore
possible benefits of parallel construction once again.
This commit is contained in:
Martin Robinson 2016-02-19 14:52:56 -08:00
parent ff20a2d3dc
commit 630a9d4255
3 changed files with 3 additions and 80 deletions
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60
components/layout/parallel.rs
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@ -17,8 +17,8 @@ use std::sync::atomic::{AtomicIsize, Ordering};
use style::dom::{TNode, UnsafeNode};
use style::parallel::{CHUNK_SIZE, WorkQueueData};
use style::parallel::{run_queue_with_custom_work_data_type};
use traversal::{AssignBSizesAndStoreOverflow, AssignISizes, BubbleISizes};
use traversal::{BuildDisplayList, ComputeAbsolutePositions, PostorderNodeMutTraversal};
use traversal::AssignBSizesAndStoreOverflow;
use traversal::{AssignISizes, BubbleISizes, PostorderNodeMutTraversal};
use util::opts;
use util::workqueue::{WorkQueue, WorkUnit, WorkerProxy};
@ -200,23 +200,6 @@ impl<'a> ParallelPreorderFlowTraversal for AssignISizes<'a> {
impl<'a> ParallelPostorderFlowTraversal for AssignBSizesAndStoreOverflow<'a> {}
impl<'a> ParallelPreorderFlowTraversal for ComputeAbsolutePositions<'a> {
fn run_parallel(&self,
unsafe_flows: UnsafeFlowList,
proxy: &mut WorkerProxy<SharedLayoutContext, UnsafeFlowList>) {
self.run_parallel_helper(unsafe_flows,
proxy,
compute_absolute_positions,
build_display_list)
}
fn should_record_thread_ids(&self) -> bool {
false
}
}
impl<'a> ParallelPostorderFlowTraversal for BuildDisplayList<'a> {}
fn assign_inline_sizes(unsafe_flows: UnsafeFlowList,
proxy: &mut WorkerProxy<SharedLayoutContext, UnsafeFlowList>) {
let shared_layout_context = proxy.user_data();
@ -237,28 +220,6 @@ fn assign_block_sizes_and_store_overflow(
assign_block_sizes_traversal.run_parallel(unsafe_flow)
}
fn compute_absolute_positions(
unsafe_flows: UnsafeFlowList,
proxy: &mut WorkerProxy<SharedLayoutContext, UnsafeFlowList>) {
let shared_layout_context = proxy.user_data();
let layout_context = LayoutContext::new(shared_layout_context);
let compute_absolute_positions_traversal = ComputeAbsolutePositions {
layout_context: &layout_context,
};
compute_absolute_positions_traversal.run_parallel(unsafe_flows, proxy);
}
fn build_display_list(unsafe_flow: UnsafeFlow,
shared_layout_context: &SharedLayoutContext) {
let layout_context = LayoutContext::new(shared_layout_context);
let build_display_list_traversal = BuildDisplayList {
layout_context: &layout_context,
};
build_display_list_traversal.run_parallel(unsafe_flow);
}
pub fn traverse_flow_tree_preorder(
root: &mut FlowRef,
profiler_metadata: Option<TimerMetadata>,
@ -281,20 +242,3 @@ pub fn traverse_flow_tree_preorder(
});
}, shared_layout_context);
}
pub fn build_display_list_for_subtree(
root: &mut FlowRef,
profiler_metadata: Option<TimerMetadata>,
time_profiler_chan: time::ProfilerChan,
shared_layout_context: &SharedLayoutContext,
queue: &mut WorkQueue<SharedLayoutContext, WorkQueueData>) {
run_queue_with_custom_work_data_type(queue, |queue| {
profile(time::ProfilerCategory::LayoutParallelWarmup, profiler_metadata,
time_profiler_chan, || {
queue.push(WorkUnit {
fun: compute_absolute_positions,
data: (box vec![mut_owned_flow_to_unsafe_flow(root)], 0),
})
});
}, shared_layout_context);
}