Function extent_record

BeefRT/JEMalloc/src/extent.c:914–953

* Does the metadata management portions of putting an unused extent into the * given ecache_t (coalesces and inserts into the eset). */

 * given ecache_t (coalesces and inserts into the eset).
 */
void
extent_record(tsdn_t *tsdn, pac_t *pac, ehooks_t *ehooks, ecache_t *ecache,
    edata_t *edata) {
	assert((ecache->state != extent_state_dirty &&
	    ecache->state != extent_state_muzzy) ||
	    !edata_zeroed_get(edata));

	malloc_mutex_lock(tsdn, &ecache->mtx);

	emap_assert_mapped(tsdn, pac->emap, edata);

	if (edata_guarded_get(edata)) {
		goto label_skip_coalesce;
	}
	if (!ecache->delay_coalesce) {
		edata = extent_try_coalesce(tsdn, pac, ehooks, ecache, edata,
		    NULL);
	} else if (edata_size_get(edata) >= SC_LARGE_MINCLASS) {
		assert(ecache == &pac->ecache_dirty);
		/* Always coalesce large extents eagerly. */
		bool coalesced;
		do {
			assert(edata_state_get(edata) == extent_state_active);
			edata = extent_try_coalesce_large(tsdn, pac, ehooks,
			    ecache, edata, &coalesced);
		} while (coalesced);
		if (edata_size_get(edata) >=
		    atomic_load_zu(&pac->oversize_threshold, ATOMIC_RELAXED)
		    && extent_may_force_decay(pac)) {
			/* Shortcut to purge the oversize extent eagerly. */
			malloc_mutex_unlock(tsdn, &ecache->mtx);
			extent_maximally_purge(tsdn, pac, ehooks, edata);
			return;
		}
	}
label_skip_coalesce:
	extent_deactivate_locked(tsdn, pac, ecache, edata);

	malloc_mutex_unlock(tsdn, &ecache->mtx);
}

void
extent_dalloc_gap(tsdn_t *tsdn, pac_t *pac, ehooks_t *ehooks,