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WIP: Incremental GC#5227

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carnaval wants to merge 17 commits intoJuliaLang:masterJuliaLang/julia:masterfrom carnaval:incgcCopy head branch name to clipboard

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Commits on Oct 16, 2014

• Add incremental GC & write barrier.

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• All wb are now backward for quick collections, big objects can be transients,

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• working version of promotion at sweep

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• fix darwin build & start to cleanup

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• Fix a bug where a soon-to-be-promoted object would escape the write barrier. A bit more cleanup too. Also some missing write barrier in new code.

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• repair timing & memory stats

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• count external memory alloc again

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• add peak resident memory to perf tests, slight heuristic adjustment, no there yet.

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• Prevent module level assignments from clobbering up the remembered set. A bit more tweaking of the collection heuristics. We are now faster/less memory hungry on almost every benchmark of the micro…

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• Slight allocation optimizations. Also another cleanup round.

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• More cleanup

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• Avoid a silly 1-cycle latency to old object remarking after a full collection. Slight cleanup. Address some of Jeff's comments.

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• cleanup some defines. remove useless geptr instruction. repair GC_FINAL_STATS.

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• yet another round of cleanups + some additional comments.

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• add some more timing output. improve a bit the page allocator.

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• oups

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• remove gc_inc, add more comments

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