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Chris Tate
add07dba3d
On Linux, a worker thread that exits without having made any object it allocated reachable from another thread gives back all of its memory: the pages it carved, including ProgramLifetime instances and other objects it never freed, and the system blocks it still holds. A worker carves past each slice's frontier while the arena's free lists and returned regions are set aside, takes from those free lists only once a slice has no bump room left, and records the system blocks it allocates. Messages and intern tables that share published graphs by pointer, and the process-wide key arrays of typed records, mark the thread as sharing; so does a remote free of one of its blocks. When a worker that did not share parks, the trim helper returns its pages, frees its system blocks, and restores the arena to its state at the claim, with the free blocks the worker took free again. A worker that shared keeps its memory as before. SCR_SA_DISCARD=0 keeps every worker's memory; SCR_SA_DISCARD=poison makes the discarded pages inaccessible instead, for tests.