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// Copyright 2019 The TCMalloc Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <string>
#include <thread> // NOLINT(build/c++11)
#include "gtest/gtest.h"
#include "absl/strings/str_cat.h"
#include "benchmark/benchmark.h"
#include "tcmalloc/internal/logging.h"
#include "tcmalloc/internal/memory_stats.h"
#include "tcmalloc/internal/parameter_accessors.h"
#include "tcmalloc/malloc_extension.h"
namespace tcmalloc {
namespace {
int64_t MemoryUsageSlow(pid_t pid) {
int64_t ret = 0;
FILE *f =
fopen(absl::StrCat("/proc/", pid, "/task/", pid, "/smaps").c_str(), "r");
CHECK_CONDITION(f != nullptr);
char buf[BUFSIZ];
while (fgets(buf, sizeof(buf), f) != nullptr) {
size_t rss;
if (sscanf(buf, "Rss: %zu kB", &rss) == 1) ret += rss;
}
CHECK_CONDITION(feof(f));
fclose(f);
// Rss is reported in KiB
ret *= 1024;
// A sanity check: our return value should be in the same ballpark as
// GetMemoryStats.
tcmalloc::tcmalloc_internal::MemoryStats stats;
CHECK_CONDITION(tcmalloc::tcmalloc_internal::GetMemoryStats(&stats));
EXPECT_GE(ret, 0.9 * stats.rss);
EXPECT_LE(ret, 1.1 * stats.rss);
return ret;
}
class ThreadCacheTest : public ::testing::Test {
public:
ThreadCacheTest() {
// Explicitly disable guarded allocations for this test. For aggressive
// sample rates on PPC (with 64KB pages), RSS grows quickly due to
// page-sized allocations that we don't release.
MallocExtension::SetGuardedSamplingRate(-1);
}
};
// Make sure that creating and destroying many mallocing threads
// does not leak memory.
TEST_F(ThreadCacheTest, NoLeakOnThreadDestruction) {
// Test only valid in per-thread mode
ASSERT_FALSE(MallocExtension::PerCpuCachesActive());
// Force a small sample to initialize tagged page allocator.
constexpr int64_t kAlloc = 8192;
const int64_t num_allocs =
32 * MallocExtension::GetProfileSamplingRate() / kAlloc;
for (int64_t i = 0; i < num_allocs; ++i) {
::operator delete(::operator new(kAlloc));
}
// Prefault and mlock the currently mapped address space. This avoids minor
// faults during the test from appearing as an apparent memory leak due to RSS
// growth.
//
// Previously, we tried to only mlock file-backed mappings, but page faults
// for .bss are also problematic (either from small pages [PPC] or hugepages
// [all platforms]) for test flakiness.
//
// We do *not* apply MCL_FUTURE, as to allow allocations during the test run
// to be released.
if (mlockall(MCL_CURRENT) != 0) {
GTEST_SKIP();
}
const int64_t start_size = MemoryUsageSlow(getpid());
ASSERT_GT(start_size, 0);
static const size_t kThreads = 16 * 1024;
for (int i = 0; i < kThreads; ++i) {
std::thread t([]() {
void *p = calloc(1024, 1);
benchmark::DoNotOptimize(p);
free(p);
});
t.join();
}
const int64_t end_size = MemoryUsageSlow(getpid());
// Flush the page heap. Our allocations may have been retained.
if (TCMalloc_Internal_SetHugePageFillerSkipSubreleaseInterval != nullptr) {
TCMalloc_Internal_SetHugePageFillerSkipSubreleaseInterval(
absl::ZeroDuration());
}
MallocExtension::ReleaseMemoryToSystem(std::numeric_limits<size_t>::max());
// This will detect a leak rate of 12 bytes per thread, which is well under 1%
// of the allocation done.
EXPECT_GE(192 * 1024, end_size - start_size)
<< "Before: " << start_size << " After: " << end_size;
}
} // namespace
} // namespace tcmalloc
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