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Merge #5588

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5588: Print errors when failing to create a perf counter r=matklad a=matklad



bors r+
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Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
This commit is contained in:
bors[bot] 2020-07-30 12:34:38 +00:00 committed by GitHub
commit 96c3ff1c57
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1 changed files with 10 additions and 3 deletions
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13
crates/ra_prof/src/stop_watch.rs
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@ -23,9 +23,14 @@ impl StopWatch {
pub fn start() -> StopWatch {
#[cfg(target_os = "linux")]
let counter = {
let mut counter = perf_event::Builder::new().build().ok();
let mut counter = perf_event::Builder::new()
.build()
.map_err(|err| eprintln!("Failed to create perf counter: {}", err))
.ok();
if let Some(counter) = &mut counter {
let _ = counter.enable();
if let Err(err) = counter.enable() {
eprintln!("Failed to start perf counter: {}", err)
}
}
counter
};
@ -47,7 +52,9 @@ impl StopWatch {
let time = self.time.elapsed();
#[cfg(target_os = "linux")]
let instructions = self.counter.as_mut().and_then(|it| it.read().ok());
let instructions = self.counter.as_mut().and_then(|it| {
it.read().map_err(|err| eprintln!("Failed to read perf counter: {}", err)).ok()
});
#[cfg(not(target_os = "linux"))]
let instructions = None;