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//
// Copyright (C) 2021 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.
//
//! Trace provider backed by ARM Coresight ETM, using simpleperf tool.
use anyhow::{anyhow, Result};
use std::fs::{read_dir, remove_file};
use std::path::{Path, PathBuf};
use std::time::Duration;
use trace_provider::TraceProvider;
use crate::trace_provider;
static ETM_TRACEFILE_EXTENSION: &str = "etmtrace";
static ETM_PROFILE_EXTENSION: &str = "data";
pub struct SimpleperfEtmTraceProvider {}
impl TraceProvider for SimpleperfEtmTraceProvider {
fn get_name(&self) -> &'static str {
"simpleperf_etm"
}
fn trace(&self, trace_dir: &Path, tag: &str, sampling_period: &Duration) {
let mut trace_file = PathBuf::from(trace_dir);
trace_file.push(trace_provider::construct_file_name(tag));
trace_file.set_extension(ETM_TRACEFILE_EXTENSION);
simpleperf_profcollect::record(
&trace_file,
sampling_period,
simpleperf_profcollect::RecordScope::BOTH,
);
}
fn process(&self, trace_dir: &Path, profile_dir: &Path) -> Result<()> {
read_dir(trace_dir)?
.filter_map(|e| e.ok())
.map(|e| e.path())
.filter(|e| {
e.is_file()
&& e.extension()
.and_then(|f| f.to_str())
.filter(|ext| ext == &ETM_TRACEFILE_EXTENSION)
.is_some()
})
.try_for_each(|trace_file| -> Result<()> {
let mut profile_file = PathBuf::from(profile_dir);
profile_file.push(
trace_file
.file_name()
.ok_or_else(|| anyhow!("Malformed trace path: {}", trace_file.display()))?,
);
profile_file.set_extension(ETM_PROFILE_EXTENSION);
simpleperf_profcollect::process(&trace_file, &profile_file);
remove_file(&trace_file)?;
Ok(())
})
}
}
impl SimpleperfEtmTraceProvider {
pub fn supported() -> bool {
simpleperf_profcollect::has_support()
}
}
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