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124 lines
3.5 KiB
C++
124 lines
3.5 KiB
C++
#include "runtime/memory_limit.h"
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#include <gtest/gtest.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <cerrno>
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#include <cstdint>
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#include <cstdlib>
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#include <limits>
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#include <string>
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namespace mocktail {
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namespace runtime {
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namespace {
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TEST(MemoryLimitTest, ParsesResidentAndSwapMemoryFromProcStatus) {
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const ProcessMemoryUsage usage = ParseProcessStatusMemory(R"(
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Name: mocktail
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VmSize: 999999 kB
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VmRSS: 12345 kB
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VmSwap: 678 kB
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Threads: 42
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)");
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ASSERT_TRUE(usage.valid);
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EXPECT_EQ(usage.resident_bytes, 12345U * 1024U);
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EXPECT_EQ(usage.swap_bytes, 678U * 1024U);
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EXPECT_EQ(usage.committed_bytes(), (12345U + 678U) * 1024U);
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}
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TEST(MemoryLimitTest, AcceptsKernelStatusWithoutSwapField) {
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const ProcessMemoryUsage usage =
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ParseProcessStatusMemory("Name:\tmocktail\nVmRSS:\t2048 kB\n");
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ASSERT_TRUE(usage.valid);
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EXPECT_EQ(usage.resident_bytes, 2U * 1024U * 1024U);
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EXPECT_EQ(usage.swap_bytes, 0U);
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}
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TEST(MemoryLimitTest, RejectsMissingOrMalformedResidentMemory) {
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EXPECT_FALSE(ParseProcessStatusMemory("VmSwap:\t12 kB\n").valid);
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EXPECT_FALSE(ParseProcessStatusMemory("VmRSS:\t12 MB\n").valid);
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EXPECT_FALSE(ParseProcessStatusMemory("VmRSS:\tnot-a-number kB\n").valid);
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}
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TEST(MemoryLimitTest, StartsAndPhysicallyJoinsWatchdog) {
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MemoryLimitWatchdog watchdog;
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std::string error;
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ASSERT_TRUE(watchdog.Start(std::numeric_limits<std::uint64_t>::max(),
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&error))
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<< error;
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EXPECT_TRUE(watchdog.running());
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watchdog.Stop();
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EXPECT_FALSE(watchdog.running());
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}
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TEST(MemoryLimitTest, RejectsDisabledOrDuplicateWatchdogStart) {
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MemoryLimitWatchdog watchdog;
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std::string error;
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EXPECT_FALSE(watchdog.Start(0, &error));
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EXPECT_NE(error.find("non-zero"), std::string::npos);
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error.clear();
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ASSERT_TRUE(watchdog.Start(std::numeric_limits<std::uint64_t>::max(),
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&error))
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<< error;
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EXPECT_FALSE(watchdog.Start(1024U * 1024U, &error));
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EXPECT_NE(error.find("already running"), std::string::npos);
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watchdog.Stop();
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}
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TEST(MemoryLimitTest, ReexecutesInsideVerifiedCgroupV2LimitWhenAvailable) {
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constexpr std::uint64_t kTestLimitBytes = 64ULL * 1024ULL * 1024ULL;
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constexpr char kChildMarker[] = "MOCKTAIL_MEMORY_LIMIT_TEST_CHILD";
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char program[] = "memory_limit_test";
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char filter[] =
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"--gtest_filter=MemoryLimitTest."
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"ReexecutesInsideVerifiedCgroupV2LimitWhenAvailable";
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char* arguments[] = {program, filter, nullptr};
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if (getenv(kChildMarker) == nullptr) {
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ASSERT_EQ(setenv(kChildMarker, "1", 1), 0);
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}
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const CgroupMemoryLimitResult result =
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MaybeReexecWithCgroupMemoryLimit(2, arguments, kTestLimitBytes);
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if (result.status == CgroupMemoryLimitStatus::kUnavailable) {
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(void)unsetenv(kChildMarker);
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GTEST_SKIP() << result.detail;
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}
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ASSERT_EQ(result.status, CgroupMemoryLimitStatus::kActive) << result.detail;
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EXPECT_TRUE(result.active());
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(void)unsetenv(kChildMarker);
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}
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TEST(MemoryLimitTest, TerminatesOnlyGuardedProcessWithExit137) {
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const pid_t child = fork();
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ASSERT_GE(child, 0);
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if (child == 0) {
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MemoryLimitWatchdog watchdog;
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std::string error;
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if (!watchdog.Start(1, &error)) {
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std::_Exit(2);
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}
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while (true) {
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pause();
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}
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}
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int child_status = 0;
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pid_t waited = -1;
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do {
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waited = waitpid(child, &child_status, 0);
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} while (waited < 0 && errno == EINTR);
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ASSERT_EQ(waited, child);
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ASSERT_TRUE(WIFEXITED(child_status));
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EXPECT_EQ(WEXITSTATUS(child_status), 137);
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}
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} // namespace
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} // namespace runtime
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} // namespace mocktail
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