Function pac_expand_impl

BeefRT/JEMalloc/src/pac.c:190–226

}

static bool
pac_expand_impl(tsdn_t *tsdn, pai_t *self, edata_t *edata, size_t old_size,
    size_t new_size, bool zero, bool *deferred_work_generated) {
	pac_t *pac = (pac_t *)self;
	ehooks_t *ehooks = pac_ehooks_get(pac);

	size_t mapped_add = 0;
	size_t expand_amount = new_size - old_size;

	if (ehooks_merge_will_fail(ehooks)) {
		return true;
	}
	edata_t *trail = ecache_alloc(tsdn, pac, ehooks, &pac->ecache_dirty,
	    edata, expand_amount, PAGE, zero, /* guarded*/ false);
	if (trail == NULL) {
		trail = ecache_alloc(tsdn, pac, ehooks, &pac->ecache_muzzy,
		    edata, expand_amount, PAGE, zero, /* guarded*/ false);
	}
	if (trail == NULL) {
		trail = ecache_alloc_grow(tsdn, pac, ehooks,
		    &pac->ecache_retained, edata, expand_amount, PAGE, zero,
		    /* guarded */ false);
		mapped_add = expand_amount;
	}
	if (trail == NULL) {
		return true;
	}
	if (extent_merge_wrapper(tsdn, pac, ehooks, edata, trail)) {
		extent_dalloc_wrapper(tsdn, pac, ehooks, trail);
		return true;
	}
	if (config_stats && mapped_add > 0) {
		atomic_fetch_add_zu(&pac->stats->pac_mapped, mapped_add,
		    ATOMIC_RELAXED);
	}
	return false;
}

static bool
pac_shrink_impl(tsdn_t *tsdn, pai_t *self, edata_t *edata, size_t old_size,