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Sébastien Paolacci authored
Periodically browse MHeap's freelists for long unused spans and release them if any. Current hardcoded settings: - GC is forced if none occured over the last 2 minutes. - spans are handed back after 5 minutes of uselessness. SysUnused (for Unix) is a wrapper on madvise MADV_DONTNEED on Linux and MADV_FREE on BSDs. R=rsc, dvyukov, remyoudompheng CC=golang-dev https://golang.org/cl/5451057
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