diff --git a/include/jemalloc/internal/eset.h b/include/jemalloc/internal/eset.h
index 400316ed..77a55e9b 100644
--- a/include/jemalloc/internal/eset.h
+++ b/include/jemalloc/internal/eset.h
@@ -72,5 +72,11 @@ size_t eset_nbytes_get(eset_t *eset, pszind_t ind);
 
 void eset_insert_locked(tsdn_t *tsdn, eset_t *eset, extent_t *extent);
 void eset_remove_locked(tsdn_t *tsdn, eset_t *eset, extent_t *extent);
+/*
+ * Select an extent from this eset of the given size and alignment.  Returns
+ * null if no such item could be found.
+ */
+extent_t *eset_fit_locked(tsdn_t *tsdn, eset_t *eset, size_t esize,
+    size_t alignment);
 
 #endif /* JEMALLOC_INTERNAL_ESET_H */
diff --git a/src/eset.c b/src/eset.c
index 21dcccad..68ec7e46 100644
--- a/src/eset.c
+++ b/src/eset.c
@@ -2,6 +2,8 @@
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 
 #include "jemalloc/internal/eset.h"
+/* For opt_retain */
+#include "jemalloc/internal/extent_mmap.h"
 
 const bitmap_info_t eset_bitmap_info =
     BITMAP_INFO_INITIALIZER(SC_NPSIZES+1);
@@ -121,3 +123,113 @@ eset_remove_locked(tsdn_t *tsdn, eset_t *eset, extent_t *extent) {
 	atomic_store_zu(&eset->npages,
 	    cur_extents_npages - (size >> LG_PAGE), ATOMIC_RELAXED);
 }
+
+/*
+ * Find an extent with size [min_size, max_size) to satisfy the alignment
+ * requirement.  For each size, try only the first extent in the heap.
+ */
+static extent_t *
+eset_fit_alignment(eset_t *eset, size_t min_size, size_t max_size,
+    size_t alignment) {
+        pszind_t pind = sz_psz2ind(sz_psz_quantize_ceil(min_size));
+        pszind_t pind_max = sz_psz2ind(sz_psz_quantize_ceil(max_size));
+
+	for (pszind_t i = (pszind_t)bitmap_ffu(eset->bitmap,
+	    &eset_bitmap_info, (size_t)pind); i < pind_max; i =
+	    (pszind_t)bitmap_ffu(eset->bitmap, &eset_bitmap_info,
+	    (size_t)i+1)) {
+		assert(i < SC_NPSIZES);
+		assert(!extent_heap_empty(&eset->heaps[i]));
+		extent_t *extent = extent_heap_first(&eset->heaps[i]);
+		uintptr_t base = (uintptr_t)extent_base_get(extent);
+		size_t candidate_size = extent_size_get(extent);
+		assert(candidate_size >= min_size);
+
+		uintptr_t next_align = ALIGNMENT_CEILING((uintptr_t)base,
+		    PAGE_CEILING(alignment));
+		if (base > next_align || base + candidate_size <= next_align) {
+			/* Overflow or not crossing the next alignment. */
+			continue;
+		}
+
+		size_t leadsize = next_align - base;
+		if (candidate_size - leadsize >= min_size) {
+			return extent;
+		}
+	}
+
+	return NULL;
+}
+
+/*
+ * Do first-fit extent selection, i.e. select the oldest/lowest extent that is
+ * large enough.
+ */
+static extent_t *
+eset_first_fit_locked(tsdn_t *tsdn, eset_t *eset, size_t size) {
+	extent_t *ret = NULL;
+
+	pszind_t pind = sz_psz2ind(sz_psz_quantize_ceil(size));
+
+	if (!maps_coalesce && !opt_retain) {
+		/*
+		 * No split / merge allowed (Windows w/o retain). Try exact fit
+		 * only.
+		 */
+		return extent_heap_empty(&eset->heaps[pind]) ? NULL :
+		    extent_heap_first(&eset->heaps[pind]);
+	}
+
+	for (pszind_t i = (pszind_t)bitmap_ffu(eset->bitmap,
+	    &eset_bitmap_info, (size_t)pind);
+	    i < SC_NPSIZES + 1;
+	    i = (pszind_t)bitmap_ffu(eset->bitmap, &eset_bitmap_info,
+	    (size_t)i+1)) {
+		assert(!extent_heap_empty(&eset->heaps[i]));
+		extent_t *extent = extent_heap_first(&eset->heaps[i]);
+		assert(extent_size_get(extent) >= size);
+		/*
+		 * In order to reduce fragmentation, avoid reusing and splitting
+		 * large eset for much smaller sizes.
+		 *
+		 * Only do check for dirty eset (delay_coalesce).
+		 */
+		if (eset->delay_coalesce &&
+		    (sz_pind2sz(i) >> opt_lg_extent_max_active_fit) > size) {
+			break;
+		}
+		if (ret == NULL || extent_snad_comp(extent, ret) < 0) {
+			ret = extent;
+		}
+		if (i == SC_NPSIZES) {
+			break;
+		}
+		assert(i < SC_NPSIZES);
+	}
+
+	return ret;
+}
+
+extent_t *
+eset_fit_locked(tsdn_t *tsdn, eset_t *eset, size_t esize, size_t alignment) {
+	malloc_mutex_assert_owner(tsdn, &eset->mtx);
+
+	size_t max_size = esize + PAGE_CEILING(alignment) - PAGE;
+	/* Beware size_t wrap-around. */
+	if (max_size < esize) {
+		return NULL;
+	}
+
+	extent_t *extent = eset_first_fit_locked(tsdn, eset, max_size);
+
+	if (alignment > PAGE && extent == NULL) {
+		/*
+		 * max_size guarantees the alignment requirement but is rather
+		 * pessimistic.  Next we try to satisfy the aligned allocation
+		 * with sizes in [esize, max_size).
+		 */
+		extent = eset_fit_alignment(eset, esize, max_size, alignment);
+	}
+
+	return extent;
+}
diff --git a/src/extent.c b/src/extent.c
index 069899c2..a5f0048c 100644
--- a/src/extent.c
+++ b/src/extent.c
@@ -251,124 +251,6 @@ extent_hooks_assure_initialized(arena_t *arena,
 
 ph_gen(, extent_heap_, extent_heap_t, extent_t, ph_link, extent_snad_comp)
 
-/*
- * Find an extent with size [min_size, max_size) to satisfy the alignment
- * requirement.  For each size, try only the first extent in the heap.
- */
-static extent_t *
-extents_fit_alignment(eset_t *eset, size_t min_size, size_t max_size,
-    size_t alignment) {
-        pszind_t pind = sz_psz2ind(sz_psz_quantize_ceil(min_size));
-        pszind_t pind_max = sz_psz2ind(sz_psz_quantize_ceil(max_size));
-
-	for (pszind_t i = (pszind_t)bitmap_ffu(eset->bitmap,
-	    &eset_bitmap_info, (size_t)pind); i < pind_max; i =
-	    (pszind_t)bitmap_ffu(eset->bitmap, &eset_bitmap_info,
-	    (size_t)i+1)) {
-		assert(i < SC_NPSIZES);
-		assert(!extent_heap_empty(&eset->heaps[i]));
-		extent_t *extent = extent_heap_first(&eset->heaps[i]);
-		uintptr_t base = (uintptr_t)extent_base_get(extent);
-		size_t candidate_size = extent_size_get(extent);
-		assert(candidate_size >= min_size);
-
-		uintptr_t next_align = ALIGNMENT_CEILING((uintptr_t)base,
-		    PAGE_CEILING(alignment));
-		if (base > next_align || base + candidate_size <= next_align) {
-			/* Overflow or not crossing the next alignment. */
-			continue;
-		}
-
-		size_t leadsize = next_align - base;
-		if (candidate_size - leadsize >= min_size) {
-			return extent;
-		}
-	}
-
-	return NULL;
-}
-
-/*
- * Do first-fit extent selection, i.e. select the oldest/lowest extent that is
- * large enough.
- */
-static extent_t *
-extents_first_fit_locked(tsdn_t *tsdn, arena_t *arena, eset_t *eset,
-    size_t size) {
-	extent_t *ret = NULL;
-
-	pszind_t pind = sz_psz2ind(sz_psz_quantize_ceil(size));
-
-	if (!maps_coalesce && !opt_retain) {
-		/*
-		 * No split / merge allowed (Windows w/o retain). Try exact fit
-		 * only.
-		 */
-		return extent_heap_empty(&eset->heaps[pind]) ? NULL :
-		    extent_heap_first(&eset->heaps[pind]);
-	}
-
-	for (pszind_t i = (pszind_t)bitmap_ffu(eset->bitmap,
-	    &eset_bitmap_info, (size_t)pind);
-	    i < SC_NPSIZES + 1;
-	    i = (pszind_t)bitmap_ffu(eset->bitmap, &eset_bitmap_info,
-	    (size_t)i+1)) {
-		assert(!extent_heap_empty(&eset->heaps[i]));
-		extent_t *extent = extent_heap_first(&eset->heaps[i]);
-		assert(extent_size_get(extent) >= size);
-		/*
-		 * In order to reduce fragmentation, avoid reusing and splitting
-		 * large eset for much smaller sizes.
-		 *
-		 * Only do check for dirty eset (delay_coalesce).
-		 */
-		if (eset->delay_coalesce &&
-		    (sz_pind2sz(i) >> opt_lg_extent_max_active_fit) > size) {
-			break;
-		}
-		if (ret == NULL || extent_snad_comp(extent, ret) < 0) {
-			ret = extent;
-		}
-		if (i == SC_NPSIZES) {
-			break;
-		}
-		assert(i < SC_NPSIZES);
-	}
-
-	return ret;
-}
-
-/*
- * Do first-fit extent selection, where the selection policy choice is
- * based on eset->delay_coalesce.
- */
-static extent_t *
-extents_fit_locked(tsdn_t *tsdn, arena_t *arena, eset_t *eset,
-    size_t esize, size_t alignment) {
-	malloc_mutex_assert_owner(tsdn, &eset->mtx);
-
-	size_t max_size = esize + PAGE_CEILING(alignment) - PAGE;
-	/* Beware size_t wrap-around. */
-	if (max_size < esize) {
-		return NULL;
-	}
-
-	extent_t *extent =
-	    extents_first_fit_locked(tsdn, arena, eset, max_size);
-
-	if (alignment > PAGE && extent == NULL) {
-		/*
-		 * max_size guarantees the alignment requirement but is rather
-		 * pessimistic.  Next we try to satisfy the aligned allocation
-		 * with sizes in [esize, max_size).
-		 */
-		extent = extents_fit_alignment(eset, esize, max_size,
-		    alignment);
-	}
-
-	return extent;
-}
-
 static bool
 extent_try_delayed_coalesce(tsdn_t *tsdn, arena_t *arena,
     extent_hooks_t **r_extent_hooks, rtree_ctx_t *rtree_ctx, eset_t *eset,
@@ -790,8 +672,7 @@ extent_recycle_extract(tsdn_t *tsdn, arena_t *arena,
 			extent_unlock(tsdn, unlock_extent);
 		}
 	} else {
-		extent = extents_fit_locked(tsdn, arena, eset, esize,
-		    alignment);
+		extent = eset_fit_locked(tsdn, eset, esize, alignment);
 	}
 	if (extent == NULL) {
 		malloc_mutex_unlock(tsdn, &eset->mtx);