Function pac_dalloc_impl

BeefRT/JEMalloc/src/pac.c:250–280

}

static void
pac_dalloc_impl(tsdn_t *tsdn, pai_t *self, edata_t *edata,
    bool *deferred_work_generated) {
	pac_t *pac = (pac_t *)self;
	ehooks_t *ehooks = pac_ehooks_get(pac);

	if (edata_guarded_get(edata)) {
		/*
		 * Because cached guarded extents do exact fit only, large
		 * guarded extents are restored on dalloc eagerly (otherwise
		 * they will not be reused efficiently).  Slab sizes have a
		 * limited number of size classes, and tend to cycle faster.
		 *
		 * In the case where coalesce is restrained (VirtualFree on
		 * Windows), guarded extents are also not cached -- otherwise
		 * during arena destroy / reset, the retained extents would not
		 * be whole regions (i.e. they are split between regular and
		 * guarded).
		 */
		if (!edata_slab_get(edata) || !maps_coalesce) {
			assert(edata_size_get(edata) >= SC_LARGE_MINCLASS ||
			    !maps_coalesce);
			san_unguard_pages_two_sided(tsdn, ehooks, edata,
			    pac->emap);
		}
	}

	ecache_dalloc(tsdn, pac, ehooks, &pac->ecache_dirty, edata);
	/* Purging of deallocated pages is deferred */
	*deferred_work_generated = true;
}

static inline uint64_t
pac_ns_until_purge(tsdn_t *tsdn, decay_t *decay, size_t npages) {