| // Copyright 2013 Cloudera, Inc. |
| // |
| // 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 |
| // |
| // http://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 <gtest/gtest.h> |
| #include <glog/logging.h> |
| #include <strstream> |
| |
| #include "kudu/gutil/spinlock.h" |
| #include "kudu/util/spinlock_profiling.h" |
| #include "kudu/util/test_util.h" |
| #include "kudu/util/trace.h" |
| |
| // Can't include gutil/synchronization_profiling.h directly as it'll |
| // declare a weak symbol directly in this unit test, which the runtime |
| // linker will prefer over equivalent strong symbols for some reason. By |
| // declaring the symbol without providing an empty definition, the strong |
| // symbols are chosen when provided via shared libraries. |
| // |
| // Further reading: |
| // - http://stackoverflow.com/questions/20658809/dynamic-loading-and-weak-symbol-resolution |
| // - http://notmysock.org/blog/php/weak-symbols-arent.html |
| namespace gutil { |
| extern void SubmitSpinLockProfileData(const void *, int64); |
| } // namespace gutil |
| |
| namespace kudu { |
| |
| class SpinLockProfilingTest : public KuduTest {}; |
| |
| TEST_F(SpinLockProfilingTest, TestSpinlockProfiling) { |
| scoped_refptr<Trace> t(new Trace); |
| base::SpinLock lock; |
| { |
| ADOPT_TRACE(t.get()); |
| gutil::SubmitSpinLockProfileData(&lock, 4000000); |
| } |
| string result = t->DumpToString(true); |
| LOG(INFO) << "trace: " << result; |
| // We can't assert more specifically because the CyclesPerSecond |
| // on different machines might be different. |
| ASSERT_STR_CONTAINS(result, "Waited "); |
| ASSERT_STR_CONTAINS(result, "on lock "); |
| |
| ASSERT_GT(GetSpinLockContentionMicros(), 0); |
| } |
| |
| TEST_F(SpinLockProfilingTest, TestStackCollection) { |
| StartSynchronizationProfiling(); |
| base::SpinLock lock; |
| gutil::SubmitSpinLockProfileData(&lock, 12345); |
| StopSynchronizationProfiling(); |
| std::stringstream str; |
| int64_t dropped = 0; |
| FlushSynchronizationProfile(&str, &dropped); |
| string s = str.str(); |
| ASSERT_STR_CONTAINS(s, "12345\t1 @ "); |
| ASSERT_EQ(0, dropped); |
| } |
| |
| } // namespace kudu |