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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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 <fstream>
#include <set>
#include <sstream>
#include <string>
#include "perfetto/ext/base/file_utils.h"
#include "src/traced/probes/ftrace/ftrace_controller.h"
#include "src/traced/probes/ftrace/ftrace_procfs.h"
#include "test/gtest_and_gmock.h"
using testing::Contains;
using testing::HasSubstr;
using testing::IsEmpty;
using testing::Not;
using testing::UnorderedElementsAre;
// These tests run only on Android because on linux they require access to
// ftrace, which would be problematic in the CI when multiple tests run
// concurrently on the same machine. Android instead uses one emulator instance
// for each worker.
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
// On Android these tests conflict with traced_probes which expects to be the
// only one modifying tracing. This led to the Setup code which attempts to
// to skip these tests when traced_probes is using tracing. Unfortunately this
// is racey and we still see spurious failures in practice. For now disable
// these tests on Android also.
// TODO(b/150675975) Re-enable these tests.
#define ANDROID_ONLY_TEST(x) DISABLED_##x
#else
#define ANDROID_ONLY_TEST(x) DISABLED_##x
#endif
namespace perfetto {
namespace {
std::string GetFtracePath() {
size_t i = 0;
while (!FtraceProcfs::Create(FtraceController::kTracingPaths[i])) {
i++;
}
return std::string(FtraceController::kTracingPaths[i]);
}
std::string ReadFile(const std::string& name) {
std::string result;
PERFETTO_CHECK(base::ReadFile(GetFtracePath() + name, &result));
return result;
}
std::string GetTraceOutput() {
std::string output = ReadFile("trace");
if (output.empty()) {
ADD_FAILURE() << "Could not read trace output";
}
return output;
}
class FtraceProcfsIntegrationTest : public testing::Test {
public:
void SetUp() override;
void TearDown() override;
std::unique_ptr<FtraceProcfs> ftrace_;
};
void FtraceProcfsIntegrationTest::SetUp() {
ftrace_ = FtraceProcfs::Create(GetFtracePath());
ASSERT_TRUE(ftrace_);
if (ftrace_->IsTracingEnabled()) {
GTEST_SKIP() << "Something else is using ftrace, skipping";
}
ftrace_->DisableAllEvents();
ftrace_->ClearTrace();
ftrace_->EnableTracing();
}
void FtraceProcfsIntegrationTest::TearDown() {
ftrace_->DisableAllEvents();
ftrace_->ClearTrace();
ftrace_->DisableTracing();
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(CreateWithBadPath)) {
EXPECT_FALSE(FtraceProcfs::Create(GetFtracePath() + std::string("bad_path")));
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(ClearTrace)) {
ftrace_->WriteTraceMarker("Hello, World!");
ftrace_->ClearTrace();
EXPECT_THAT(GetTraceOutput(), Not(HasSubstr("Hello, World!")));
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(TraceMarker)) {
ftrace_->WriteTraceMarker("Hello, World!");
EXPECT_THAT(GetTraceOutput(), HasSubstr("Hello, World!"));
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(EnableDisableEvent)) {
ASSERT_TRUE(ftrace_->EnableEvent("sched", "sched_switch"));
sleep(1);
ASSERT_TRUE(ftrace_->DisableEvent("sched", "sched_switch"));
EXPECT_THAT(GetTraceOutput(), HasSubstr("sched_switch"));
ftrace_->ClearTrace();
sleep(1);
EXPECT_THAT(GetTraceOutput(), Not(HasSubstr("sched_switch")));
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(EnableDisableTracing)) {
EXPECT_TRUE(ftrace_->IsTracingEnabled());
ftrace_->WriteTraceMarker("Before");
ftrace_->DisableTracing();
EXPECT_FALSE(ftrace_->IsTracingEnabled());
ftrace_->WriteTraceMarker("During");
ftrace_->EnableTracing();
EXPECT_TRUE(ftrace_->IsTracingEnabled());
ftrace_->WriteTraceMarker("After");
EXPECT_THAT(GetTraceOutput(), HasSubstr("Before"));
EXPECT_THAT(GetTraceOutput(), Not(HasSubstr("During")));
EXPECT_THAT(GetTraceOutput(), HasSubstr("After"));
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(ReadFormatFile)) {
std::string format = ftrace_->ReadEventFormat("ftrace", "print");
EXPECT_THAT(format, HasSubstr("name: print"));
EXPECT_THAT(format, HasSubstr("field:char buf"));
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(CanOpenTracePipeRaw)) {
EXPECT_TRUE(ftrace_->OpenPipeForCpu(0));
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(Clock)) {
std::set<std::string> clocks = ftrace_->AvailableClocks();
EXPECT_THAT(clocks, Contains("local"));
EXPECT_THAT(clocks, Contains("global"));
EXPECT_TRUE(ftrace_->SetClock("global"));
EXPECT_EQ(ftrace_->GetClock(), "global");
EXPECT_TRUE(ftrace_->SetClock("local"));
EXPECT_EQ(ftrace_->GetClock(), "local");
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(CanSetBufferSize)) {
EXPECT_TRUE(ftrace_->SetCpuBufferSizeInPages(4ul));
EXPECT_EQ(ReadFile("buffer_size_kb"), "16\n"); // (4096 * 4) / 1024
EXPECT_TRUE(ftrace_->SetCpuBufferSizeInPages(5ul));
EXPECT_EQ(ReadFile("buffer_size_kb"), "20\n"); // (4096 * 5) / 1024
}
TEST_F(FtraceProcfsIntegrationTest,
ANDROID_ONLY_TEST(FtraceControllerHardReset)) {
ftrace_->SetCpuBufferSizeInPages(4ul);
ftrace_->EnableTracing();
ftrace_->EnableEvent("sched", "sched_switch");
ftrace_->WriteTraceMarker("Hello, World!");
EXPECT_EQ(ReadFile("buffer_size_kb"), "16\n");
EXPECT_EQ(ReadFile("tracing_on"), "1\n");
EXPECT_EQ(ReadFile("events/enable"), "X\n");
HardResetFtraceState();
EXPECT_EQ(ReadFile("buffer_size_kb"), "4\n");
EXPECT_EQ(ReadFile("tracing_on"), "0\n");
EXPECT_EQ(ReadFile("events/enable"), "0\n");
EXPECT_THAT(GetTraceOutput(), Not(HasSubstr("Hello")));
}
TEST_F(FtraceProcfsIntegrationTest, ANDROID_ONLY_TEST(ReadEnabledEvents)) {
EXPECT_THAT(ftrace_->ReadEnabledEvents(), IsEmpty());
ftrace_->EnableEvent("sched", "sched_switch");
ftrace_->EnableEvent("kmem", "kmalloc");
EXPECT_THAT(ftrace_->ReadEnabledEvents(),
UnorderedElementsAre("sched/sched_switch", "kmem/kmalloc"));
ftrace_->DisableEvent("sched", "sched_switch");
ftrace_->DisableEvent("kmem", "kmalloc");
EXPECT_THAT(ftrace_->ReadEnabledEvents(), IsEmpty());
}
} // namespace
} // namespace perfetto
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