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Back out https://github.com/servo/servo/pull/17198 for Gecko test failures

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This commit is contained in:
Boris Zbarsky 2017-06-07 15:57:48 -04:00
parent bf46da065d
commit 3d3ce51797
2 changed files with 6 additions and 10 deletions
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10
components/style/parallel.rs
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@ -37,11 +37,9 @@ use traversal::{DomTraversal, PerLevelTraversalData, PreTraverseToken};
///
/// Larger values will increase style sharing cache hits and general DOM locality
/// at the expense of decreased opportunities for parallelism. The style sharing
/// cache can hold 31 entries, but not all styles are shareable, so we set this
/// value to 16. The size of the cache has been measured to provide pretty good
/// sharing on a few pages, but could probably use more measurement and tuning.
/// The work unit size is a bit of a guess at the moment; again could use
/// measurement and tuning.
/// cache can hold 8 entries, but not all styles are shareable, so we set this
/// value to 16. These values have not been measured and could potentially be
/// tuned.
pub const WORK_UNIT_MAX: usize = 16;
/// Verify that the style sharing cache size doesn't change. If it does, we should
@ -50,7 +48,7 @@ pub const WORK_UNIT_MAX: usize = 16;
/// have surprising effects on the parallelism characteristics of the style system.
#[allow(dead_code)]
fn static_assert() {
unsafe { mem::transmute::<_, [u32; STYLE_SHARING_CANDIDATE_CACHE_SIZE]>([1; 31]); }
unsafe { mem::transmute::<_, [u32; STYLE_SHARING_CANDIDATE_CACHE_SIZE]>([1; 8]); }
}
/// A list of node pointers.

6
components/style/sharing/mod.rs
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@ -84,10 +84,8 @@ use stylist::{ApplicableDeclarationBlock, Stylist};
mod checks;
/// The amount of nodes that the style sharing candidate cache should hold at
/// most. We'd somewhat like 32, but ArrayDeque only implements certain backing
/// store sizes. A cache size of 32 would mean a backing store of 33, but
/// that's not an implemented size: we can do 32 or 40.
pub const STYLE_SHARING_CANDIDATE_CACHE_SIZE: usize = 31;
/// most.
pub const STYLE_SHARING_CANDIDATE_CACHE_SIZE: usize = 8;
/// Controls whether the style sharing cache is used.
#[derive(Clone, Copy, PartialEq)]