Add support for mmapping large allocations.

1 files changed, 14 insertions, 1 deletions

diff --git a/vespamalloc/src/tests/test1/new_test.cpp b/vespamalloc/src/tests/test1/new_test.cpp
index 0723f8cca85..77c07a52918 100644
--- a/vespamalloc/src/tests/test1/new_test.cpp
+++ b/vespamalloc/src/tests/test1/new_test.cpp
@@ -1,5 +1,6 @@
 // Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 #include <vespa/vespalib/testkit/testapp.h>
+#include <vespa/vespalib/util/size_literals.h>
 #include <vespa/log/log.h>
 #include <malloc.h>
 #include <dlfcn.h>
@@ -170,7 +171,19 @@ TEST("verify mallopt") {
     if (env == MallocLibrary::UNKNOWN) return;
     EXPECT_EQUAL(0, mallopt(M_MMAP_MAX, 0x1000000));
     EXPECT_EQUAL(1, mallopt(M_MMAP_THRESHOLD, 0x1000000));
-    EXPECT_EQUAL(1, mallopt(M_MMAP_THRESHOLD, -1));
+    EXPECT_EQUAL(1, mallopt(M_MMAP_THRESHOLD, 1_Gi));
+}
+
+TEST("verify mmap_limit") {
+    MallocLibrary env = detectLibrary();
+    if (env == MallocLibrary::UNKNOWN) return;
+    EXPECT_EQUAL(1, mallopt(M_MMAP_THRESHOLD, 0x100000));
+    auto small = std::make_unique<char[]>(16_Ki);
+    auto large_1 = std::make_unique<char[]>(1200_Ki);
+    EXPECT_GREATER(size_t(labs(small.get() - large_1.get())), 1_Ti);
+    EXPECT_EQUAL(1, mallopt(M_MMAP_THRESHOLD, 1_Gi));
+    auto large_2 = std::make_unique<char[]>(1200_Ki);
+    EXPECT_LESS(size_t(labs(small.get() - large_2.get())), 1_Ti);
 }