Fix unbounded increase in stash_decayed.
Added an upper bound on how many pages we can decay during the current run. Without this, decay could have unbounded increase in stashed, since other threads could add new pages into the extents.
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@@ -36,7 +36,8 @@ extent_t *extents_alloc(tsdn_t *tsdn, arena_t *arena,
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void extents_dalloc(tsdn_t *tsdn, arena_t *arena,
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extent_hooks_t **r_extent_hooks, extents_t *extents, extent_t *extent);
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extent_t *extents_evict(tsdn_t *tsdn, arena_t *arena,
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extent_hooks_t **r_extent_hooks, extents_t *extents, size_t npages_min);
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extent_hooks_t **r_extent_hooks, extents_t *extents, size_t npages_min,
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size_t npages_max);
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void extents_prefork(tsdn_t *tsdn, extents_t *extents);
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void extents_postfork_parent(tsdn_t *tsdn, extents_t *extents);
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void extents_postfork_child(tsdn_t *tsdn, extents_t *extents);
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