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67 lines
2.1 KiB
67 lines
2.1 KiB
//
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// Copyright (C) 2021 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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//! This module implements safe wrappers for simpleperf etm operations required
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//! by profcollect.
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use std::ffi::CString;
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use std::path::Path;
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use std::time::Duration;
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fn path_to_cstr(path: &Path) -> CString {
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CString::new(path.to_str().unwrap()).unwrap()
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}
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/// Returns whether the system has support for simpleperf etm.
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pub fn has_support() -> bool {
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unsafe { simpleperf_profcollect_bindgen::HasSupport() }
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}
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/// ETM recording scope
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pub enum RecordScope {
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/// Record etm data only for userspace.
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USERSPACE,
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/// Record etm data only for kernel.
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KERNEL,
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/// Record etm data for both userspace and kernel.
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BOTH,
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}
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/// Trigger an ETM trace event.
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pub fn record(trace_file: &Path, duration: &Duration, scope: RecordScope) {
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let event_name: CString = match scope {
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RecordScope::USERSPACE => CString::new("cs-etm:u").unwrap(),
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RecordScope::KERNEL => CString::new("cs-etm:k").unwrap(),
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RecordScope::BOTH => CString::new("cs-etm").unwrap(),
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};
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let trace_file = path_to_cstr(trace_file);
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let duration = duration.as_secs_f32();
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unsafe {
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simpleperf_profcollect_bindgen::Record(event_name.as_ptr(), trace_file.as_ptr(), duration);
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}
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}
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/// Translate ETM trace to profile.
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pub fn process(trace_path: &Path, profile_path: &Path) {
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let trace_path = path_to_cstr(trace_path);
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let profile_path = path_to_cstr(profile_path);
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unsafe {
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simpleperf_profcollect_bindgen::Inject(trace_path.as_ptr(), profile_path.as_ptr());
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}
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}
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