[NFC][scudo] Add releasePagesToOS test
GitOrigin-RevId: 0bccdf82f7057da9bf59f94338e6809284d068ec
diff --git a/tests/common_test.cpp b/tests/common_test.cpp
new file mode 100644
index 0000000..7b35b24
--- /dev/null
+++ b/tests/common_test.cpp
@@ -0,0 +1,58 @@
+//===-- common_test.cpp ---------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "internal_defs.h"
+#include "tests/scudo_unit_test.h"
+
+#include "common.h"
+#include <algorithm>
+#include <fstream>
+
+namespace scudo {
+
+static uptr getResidentMemorySize() {
+ uptr Size;
+ uptr Resident;
+ std::ifstream IFS("/proc/self/statm");
+ IFS >> Size;
+ IFS >> Resident;
+ return Resident * getPageSizeCached();
+}
+
+// Fuchsia needs getResidentMemorySize implementation.
+TEST(ScudoCommonTest, SKIP_ON_FUCHSIA(ResidentMemorySize)) {
+ uptr OnStart = getResidentMemorySize();
+ EXPECT_GT(OnStart, 0);
+
+ const uptr Size = 1ull << 30;
+ const uptr Threshold = Size >> 3;
+
+ MapPlatformData Data;
+ uptr *P = reinterpret_cast<uptr *>(
+ map(nullptr, Size, "ResidentMemorySize", 0, &Data));
+ const uptr N = Size / sizeof(*P);
+ ASSERT_NE(nullptr, P);
+ EXPECT_EQ(std::count(P, P + N, 0), N);
+ EXPECT_LT(getResidentMemorySize() - OnStart, Threshold);
+
+ memset(P, 1, Size);
+ EXPECT_EQ(std::count(P, P + N, 0), 0);
+ EXPECT_LT(getResidentMemorySize() - Size, Threshold);
+
+ releasePagesToOS((uptr)P, 0, Size, &Data);
+ EXPECT_EQ(std::count(P, P + N, 0), N);
+ // FIXME: does not work with QEMU-user.
+ // EXPECT_LT(getResidentMemorySize() - OnStart, Threshold) << OnStart << " "
+ // << getResidentMemorySize();
+
+ memset(P, 1, Size);
+ EXPECT_EQ(std::count(P, P + N, 0), 0);
+ EXPECT_LT(getResidentMemorySize() - Size, Threshold);
+}
+
+} // namespace scudo
\ No newline at end of file
