100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <sys/mman.h>
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#include <map>
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#include "gtest/gtest.h"
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#include "gtest/gtest.h"
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#include "absl/strings/match.h"
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#include "absl/strings/numbers.h"
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#include "absl/strings/str_format.h"
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#include "absl/strings/str_split.h"
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#include "test/util/fs_util.h"
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#include "test/util/posix_error.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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using ::absl::StrFormat;
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// AnonUsageFromMeminfo scrapes the current anonymous memory usage from
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// /proc/meminfo and returns it in bytes.
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PosixErrorOr<uint64_t> AnonUsageFromMeminfo() {
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ASSIGN_OR_RETURN_ERRNO(auto meminfo, GetContents("/proc/meminfo"));
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std::vector<std::string> lines(absl::StrSplit(meminfo, '\n'));
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// Try to find AnonPages line, the format is AnonPages:\\s+(\\d+) kB\n.
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for (const auto& line : lines) {
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if (!absl::StartsWith(line, "AnonPages:")) {
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continue;
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}
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std::vector<std::string> parts(
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absl::StrSplit(line, ' ', absl::SkipEmpty()));
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if (parts.size() == 3) {
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// The size is the second field, let's try to parse it as a number.
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ASSIGN_OR_RETURN_ERRNO(auto anon_kb, Atoi<uint64_t>(parts[1]));
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return anon_kb * 1024;
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}
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return PosixError(EINVAL, "AnonPages field in /proc/meminfo was malformed");
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}
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return PosixError(EINVAL, "AnonPages field not found in /proc/meminfo");
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}
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TEST(MemoryAccounting, AnonAccountingPreservedOnSaveRestore) {
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// This test isn't meaningful on Linux. /proc/meminfo reports system-wide
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// memory usage, which can change arbitrarily in Linux from other activity on
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// the machine. In gvisor, this test is the only thing running on the
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// "machine", so values in /proc/meminfo accurately reflect the memory used by
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// the test.
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SKIP_IF(!IsRunningOnGvisor());
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uint64_t anon_initial = ASSERT_NO_ERRNO_AND_VALUE(AnonUsageFromMeminfo());
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// Cause some anonymous memory usage.
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uint64_t map_bytes = Megabytes(512);
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char* mem =
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static_cast<char*>(mmap(nullptr, map_bytes, PROT_READ | PROT_WRITE,
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MAP_POPULATE | MAP_ANON | MAP_PRIVATE, -1, 0));
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ASSERT_NE(mem, MAP_FAILED)
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<< "Map failed, errno: " << errno << " (" << strerror(errno) << ").";
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// Write something to each page to prevent them from being decommited on
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// S/R. Zero pages are dropped on save.
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for (uint64_t i = 0; i < map_bytes; i += kPageSize) {
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mem[i] = 'a';
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}
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uint64_t anon_after_alloc = ASSERT_NO_ERRNO_AND_VALUE(AnonUsageFromMeminfo());
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EXPECT_THAT(anon_after_alloc,
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EquivalentWithin(anon_initial + map_bytes, 0.03));
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// We have many implicit S/R cycles from scraping /proc/meminfo throughout the
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// test, but throw an explicit S/R in here as well.
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MaybeSave();
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// Usage should remain the same across S/R.
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uint64_t anon_after_sr = ASSERT_NO_ERRNO_AND_VALUE(AnonUsageFromMeminfo());
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EXPECT_THAT(anon_after_sr, EquivalentWithin(anon_after_alloc, 0.03));
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}
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} // namespace
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} // namespace testing
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} // namespace gvisor
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