task_state.cc | Explore in Territory

/*
 * Copyright (C) 2019 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 "src/trace_processor/types/task_state.h"

#include <string.h>

#include "perfetto/base/logging.h"

namespace perfetto {
namespace trace_processor {
namespace ftrace_utils {

// static
TaskState TaskState::FromRawPrevState(
    uint16_t raw_state,
    std::optional<VersionNumber> kernel_version) { … }

// static
TaskState TaskState::FromSystrace(const char* state_str) { … }

// static
TaskState TaskState::FromParsedFlags(uint16_t parsed_state) { … }

// See header for extra details.
//
// Note to maintainers: going forward, the most likely "breaking" changes are:
// * a new flag is added to TASK_REPORT (see include/linux/sched.h kernel src)
// * a new report-specific flag is added above TASK_REPORT
// In both cases, this will change the value of TASK_REPORT_MAX that is used to
// report preemption in sched_switch. We'll need to modify this class to keep
// up, or make traced_probes record the sched_switch format string in traces.
//
// Note to maintainers: if changing the default kernel assumption or the 4.4
// codepath, you'll need to update ToRawStateOnlyForSystraceConversions().
TaskState::TaskState(uint16_t raw_state,
                     std::optional<VersionNumber> opt_version) { … }

TaskState::TaskStateStr TaskState::ToString(char separator) const { … }

// Used when parsing systrace, i.e. textual ftrace output.
TaskState::TaskState(const char* state_str) { … }

// Hard-assume 4.4 flag layout per the header rationale.
uint16_t TaskState::ToRawStateOnlyForSystraceConversions() const { … }

}  // namespace ftrace_utils
}  // namespace trace_processor
}  // namespace perfetto
chromium/third_party/perfetto/src/trace_processor/types/task_state.cc
