diff --git a/include/jemalloc/internal/pa.h b/include/jemalloc/internal/pa.h
index 0cf83cc3..1c84c8de 100644
--- a/include/jemalloc/internal/pa.h
+++ b/include/jemalloc/internal/pa.h
@@ -162,10 +162,10 @@ size_t pa_shard_extent_sn_next(pa_shard_t *shard);
 
 /* Gets an edata for the given allocation. */
 edata_t *pa_alloc(tsdn_t *tsdn, pa_shard_t *shard, size_t size,
-    size_t alignment, bool slab, szind_t szind, bool *zero, size_t *mapped_add);
+    size_t alignment, bool slab, szind_t szind, bool *zero);
 /* Returns true on error, in which case nothing changed. */
 bool pa_expand(tsdn_t *tsdn, pa_shard_t *shard, edata_t *edata, size_t old_size,
-    size_t new_size, szind_t szind, bool slab, bool *zero, size_t *mapped_add);
+    size_t new_size, szind_t szind, bool slab, bool *zero);
 /*
  * The same.  Sets *generated_dirty to true if we produced new dirty pages, and
  * false otherwise.
diff --git a/src/arena.c b/src/arena.c
index 2fe69041..c4bf29fc 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -424,21 +424,15 @@ edata_t *
 arena_extent_alloc_large(tsdn_t *tsdn, arena_t *arena, size_t usize,
     size_t alignment, bool *zero) {
 	szind_t szind = sz_size2index(usize);
-	size_t mapped_add;
 	size_t esize = usize + sz_large_pad;
 
 	edata_t *edata = pa_alloc(tsdn, &arena->pa_shard, esize, alignment,
-	    /* slab */ false, szind, zero, &mapped_add);
+	    /* slab */ false, szind, zero);
 
 	if (edata != NULL) {
 		if (config_stats) {
 			LOCKEDINT_MTX_LOCK(tsdn, arena->stats.mtx);
 			arena_large_malloc_stats_update(tsdn, arena, usize);
-			if (mapped_add != 0) {
-				atomic_fetch_add_zu(
-				    &arena->pa_shard.stats->mapped, mapped_add,
-				    ATOMIC_RELAXED);
-			}
 			LOCKEDINT_MTX_UNLOCK(tsdn, arena->stats.mtx);
 		}
 	}
@@ -842,14 +836,9 @@ arena_slab_alloc(tsdn_t *tsdn, arena_t *arena, szind_t binind, unsigned binshard
 	    WITNESS_RANK_CORE, 0);
 
 	bool zero = false;
-	size_t mapped_add = 0;
 
 	edata_t *slab = pa_alloc(tsdn, &arena->pa_shard, bin_info->slab_size,
-	    PAGE, /* slab */ true, /* szind */ binind, &zero, &mapped_add);
-	if (config_stats && slab != NULL && mapped_add != 0) {
-		atomic_fetch_add_zu(&arena->pa_shard.stats->mapped, mapped_add,
-		    ATOMIC_RELAXED);
-	}
+	    PAGE, /* slab */ true, /* szind */ binind, &zero);
 
 	if (slab == NULL) {
 		return NULL;
diff --git a/src/large.c b/src/large.c
index f61d1fed..494a32ba 100644
--- a/src/large.c
+++ b/src/large.c
@@ -113,19 +113,13 @@ large_ralloc_no_move_expand(tsdn_t *tsdn, edata_t *edata, size_t usize,
 	 * below, even if is_zeroed_trail ends up true when zero is false.
 	 */
 	bool is_zeroed_trail = zero;
-	size_t mapped_add;
 	szind_t szind = sz_size2index(usize);
 	bool err = pa_expand(tsdn, &arena->pa_shard, edata, old_size, new_size,
-	    szind, /* slab */ false, &is_zeroed_trail, &mapped_add);
+	    szind, /* slab */ false, &is_zeroed_trail);
 	if (err) {
 		return true;
 	}
 
-	if (config_stats && mapped_add > 0) {
-		atomic_fetch_add_zu(&arena->pa_shard.stats->mapped, mapped_add,
-		    ATOMIC_RELAXED);
-	}
-
 	if (zero) {
 		if (config_cache_oblivious) {
 			/*
diff --git a/src/pa.c b/src/pa.c
index e20eab94..10a4401e 100644
--- a/src/pa.c
+++ b/src/pa.c
@@ -77,16 +77,17 @@ pa_shard_may_have_muzzy(pa_shard_t *shard) {
 
 edata_t *
 pa_alloc(tsdn_t *tsdn, pa_shard_t *shard, size_t size, size_t alignment,
-    bool slab, szind_t szind, bool *zero, size_t *mapped_add) {
+    bool slab, szind_t szind, bool *zero) {
 	witness_assert_depth_to_rank(tsdn_witness_tsdp_get(tsdn),
 	    WITNESS_RANK_CORE, 0);
-	*mapped_add = 0;
+
+	size_t mapped_add = 0;
 
 	ehooks_t *ehooks = pa_shard_ehooks_get(shard);
-
 	edata_t *edata = ecache_alloc(tsdn, shard, ehooks,
 	    &shard->ecache_dirty, NULL, size, alignment, slab, szind,
 	    zero);
+
 	if (edata == NULL && pa_shard_may_have_muzzy(shard)) {
 		edata = ecache_alloc(tsdn, shard, ehooks, &shard->ecache_muzzy,
 		    NULL, size, alignment, slab, szind, zero);
@@ -95,24 +96,21 @@ pa_alloc(tsdn_t *tsdn, pa_shard_t *shard, size_t size, size_t alignment,
 		edata = ecache_alloc_grow(tsdn, shard, ehooks,
 		    &shard->ecache_retained, NULL, size, alignment, slab,
 		    szind, zero);
-		if (config_stats && edata != NULL) {
-			/*
-			 * edata may be NULL on OOM, but in that case mapped_add
-			 * isn't used below, so there's no need to conditionlly
-			 * set it to 0 here.
-			 */
-			*mapped_add = size;
-		}
+		mapped_add = size;
 	}
 	if (edata != NULL) {
 		pa_nactive_add(shard, size >> LG_PAGE);
+		if (config_stats && mapped_add > 0) {
+			atomic_fetch_add_zu(&shard->stats->mapped, mapped_add,
+			    ATOMIC_RELAXED);
+		}
 	}
 	return edata;
 }
 
 bool
 pa_expand(tsdn_t *tsdn, pa_shard_t *shard, edata_t *edata, size_t old_size,
-    size_t new_size, szind_t szind, bool slab, bool *zero, size_t *mapped_add) {
+    size_t new_size, szind_t szind, bool slab, bool *zero) {
 	assert(new_size > old_size);
 	assert(edata_size_get(edata) == old_size);
 	assert((new_size & PAGE_MASK) == 0);
@@ -121,7 +119,8 @@ pa_expand(tsdn_t *tsdn, pa_shard_t *shard, edata_t *edata, size_t old_size,
 	void *trail_begin = edata_past_get(edata);
 	size_t expand_amount = new_size - old_size;
 
-	*mapped_add = 0;
+	size_t mapped_add = 0;
+
 	if (ehooks_merge_will_fail(ehooks)) {
 		return true;
 	}
@@ -137,18 +136,20 @@ pa_expand(tsdn_t *tsdn, pa_shard_t *shard, edata_t *edata, size_t old_size,
 		trail = ecache_alloc_grow(tsdn, shard, ehooks,
 		    &shard->ecache_retained, trail_begin, expand_amount, PAGE,
 		    /* slab */ false, SC_NSIZES, zero);
-		*mapped_add = expand_amount;
+		mapped_add = expand_amount;
 	}
 	if (trail == NULL) {
-		*mapped_add = 0;
 		return true;
 	}
 	if (extent_merge_wrapper(tsdn, ehooks, &shard->edata_cache, edata,
 	    trail)) {
 		extent_dalloc_wrapper(tsdn, shard, ehooks, trail);
-		*mapped_add = 0;
 		return true;
 	}
+	if (config_stats && mapped_add > 0) {
+		atomic_fetch_add_zu(&shard->stats->mapped, mapped_add,
+		    ATOMIC_RELAXED);
+	}
 	pa_nactive_add(shard, expand_amount >> LG_PAGE);
 	emap_remap(tsdn, &emap_global, edata, szind, slab);
 	return false;