From 584ab041f52fc40d5745c7d42901c726b9679079 Mon Sep 17 00:00:00 2001
From: Otto Moerbeek <otto.moerbeek@open-xchange.com>
Date: Fri, 15 Mar 2019 12:23:00 +0100
Subject: [PATCH] Move back to malloc on !OpenBSD. Doing mmap/munmap all the
 time hurts too much.

---
 pdns/lazy_allocator.hh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/pdns/lazy_allocator.hh b/pdns/lazy_allocator.hh
index 4851687ba6..68ba53619e 100644
--- a/pdns/lazy_allocator.hh
+++ b/pdns/lazy_allocator.hh
@@ -43,16 +43,29 @@ struct lazy_allocator {
 
     pointer
     allocate (size_type const n) {
+#ifdef __OpenBSD__
         void *p = mmap(nullptr, n * sizeof(value_type),
           PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_STACK, -1, 0);
         if (p == MAP_FAILED)
           throw std::bad_alloc();
         return static_cast<pointer>(p);
+#else
+        return static_cast<pointer>(::operator new (n * sizeof(value_type)));
+#endif
     }
 
     void
     deallocate (pointer const ptr, size_type const n) noexcept {
+#ifdef __OpenBSD__
         munmap(ptr, n * sizeof(value_type));
+#else
+#if defined(__cpp_sized_deallocation) &&  (__cpp_sized_deallocation >= 201309)
+        ::operator delete (ptr, n * sizeof(value_type));
+#else
+        (void) n;
+        ::operator delete (ptr);
+#endif
+#endif
     }
 
     void construct (T*) const noexcept {}
-- 
2.47.2