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[NFC][scudo] Add releasePagesToOS test
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//===-- 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 | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#include "internal_defs.h" | ||
#include "tests/scudo_unit_test.h" | ||
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#include "common.h" | ||
#include <algorithm> | ||
#include <fstream> | ||
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namespace scudo { | ||
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static uptr getResidentMemorySize() { | ||
uptr Size; | ||
uptr Resident; | ||
std::ifstream IFS("/proc/self/statm"); | ||
IFS >> Size; | ||
IFS >> Resident; | ||
return Resident * getPageSizeCached(); | ||
} | ||
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// Fuchsia needs getResidentMemorySize implementation. | ||
TEST(ScudoCommonTest, SKIP_ON_FUCHSIA(ResidentMemorySize)) { | ||
uptr OnStart = getResidentMemorySize(); | ||
EXPECT_GT(OnStart, 0); | ||
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const uptr Size = 1ull << 30; | ||
const uptr Threshold = Size >> 3; | ||
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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); | ||
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memset(P, 1, Size); | ||
EXPECT_EQ(std::count(P, P + N, 0), 0); | ||
EXPECT_LT(getResidentMemorySize() - Size, Threshold); | ||
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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(); | ||
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memset(P, 1, Size); | ||
EXPECT_EQ(std::count(P, P + N, 0), 0); | ||
EXPECT_LT(getResidentMemorySize() - Size, Threshold); | ||
} | ||
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} // namespace scudo |