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Bring a few minor GC patches from upstream #163

Merged
merged 7 commits into from
Jul 3, 2024
Merged

Bring a few minor GC patches from upstream #163

merged 7 commits into from
Jul 3, 2024

Commits on Jun 28, 2024

  1. reset mark queue indices at the end of GC (JuliaLang#52780) 

    Should allow us to access fewer pages on the circular buffers owned by
these work-stealing queues.
    @d-netto
    d-netto committed Jun 28, 2024
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  2. optimize remset marking (JuliaLang#52476) 

    Tag the lowest bit of a pointer to indicate it's in the remset and
enqueue objects in the remset for later processing when GC threads have
woken up, instead of sequentially marking them all at once.

In principle, this should allow for more parallelism in the mark phase,
though I didn't benchmark it yet.
    @d-netto
    d-netto committed Jun 28, 2024
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  3. print types more verbosely in page profiler (JuliaLang#53256) 

    Instead of just printing `Tuple`, print the full type signature such as
`Tuple{UnionAll, GenericMemory{:not_atomic, Tuple{Int64, Int64,
Array{Pair{Any, Any}, 1}}, Core.AddrSpace{Core}(0x00)}, Int64}`
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  4. fix stale docstring in gc_sweep_page (JuliaLang#54743)

    @d-netto
    d-netto committed Jun 28, 2024
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  5. use atomic-fetch-and in write barrier slow-path (JuliaLang#54744) 

    Not sure why we're not using it, but we probably should.
    @d-netto
    d-netto committed Jun 28, 2024
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  6. remove a bunch of bit unnecessary bit clearing in bigval's sz field (J… 

    …uliaLang#54946)

We don't store anything in the lowest two bits of `sz` after
JuliaLang#49644.
    @d-netto
    d-netto committed Jun 28, 2024
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  7. simplify handling of buffered pages (JuliaLang#54961) 

    Simplifies handling of buffered pages by keeping them in a single place (`global_page_pool_lazily_freed`) instead of making them thread local. Performance has been assessed on the serial & multithreaded GCBenchmarks and it has shown to be performance neutral.
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