Vendor things

third-party/vendor/tracing/benches/baseline.rs

@@ -0,0 +1,24 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+fn bench(c: &mut Criterion) {
+    use std::sync::atomic::{AtomicUsize, Ordering};
+
+    let mut group = c.benchmark_group("comparison");
+    group.bench_function("relaxed_load", |b| {
+        let foo = AtomicUsize::new(1);
+        b.iter(|| black_box(foo.load(Ordering::Relaxed)));
+    });
+    group.bench_function("acquire_load", |b| {
+        let foo = AtomicUsize::new(1);
+        b.iter(|| black_box(foo.load(Ordering::Acquire)))
+    });
+    group.bench_function("log", |b| {
+        b.iter(|| {
+            log::log!(log::Level::Info, "log");
+        })
+    });
+    group.finish();
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);

third-party/vendor/tracing/benches/dispatch_get_clone.rs

@@ -0,0 +1,15 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+mod shared;
+
+fn bench(c: &mut Criterion) {
+    shared::for_all_dispatches(&mut c.benchmark_group("Dispatch::get_clone"), |b| {
+        b.iter(|| {
+            let current = tracing::dispatcher::get_default(|current| current.clone());
+            black_box(current);
+        })
+    });
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);

third-party/vendor/tracing/benches/dispatch_get_ref.rs

@@ -0,0 +1,16 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+mod shared;
+
+fn bench(c: &mut Criterion) {
+    shared::for_all_dispatches(&mut c.benchmark_group("Dispatch::get_ref"), |b| {
+        b.iter(|| {
+            tracing::dispatcher::get_default(|current| {
+                black_box(&current);
+            })
+        })
+    });
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);

third-party/vendor/tracing/benches/empty_span.rs

@@ -0,0 +1,43 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+mod shared;
+
+fn bench(c: &mut Criterion) {
+    let mut group = c.benchmark_group("empty_span");
+    shared::for_all_dispatches(&mut group, |b| {
+        b.iter(|| {
+            let span = tracing::span::Span::none();
+            black_box(&span);
+        })
+    });
+    group.bench_function("baseline_struct", |b| {
+        b.iter(|| {
+            let span = FakeEmptySpan::new();
+            black_box(&span);
+        })
+    });
+}
+
+struct FakeEmptySpan {
+    inner: Option<(usize, std::sync::Arc<()>)>,
+    meta: Option<&'static ()>,
+}
+
+impl FakeEmptySpan {
+    fn new() -> Self {
+        Self {
+            inner: None,
+            meta: None,
+        }
+    }
+}
+
+impl Drop for FakeEmptySpan {
+    fn drop(&mut self) {
+        black_box(&self.inner);
+        black_box(&self.meta);
+    }
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);

third-party/vendor/tracing/benches/enter_span.rs

@@ -0,0 +1,16 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use tracing::{span, Level};
+
+mod shared;
+
+fn bench(c: &mut Criterion) {
+    shared::for_all_dispatches(&mut c.benchmark_group("enter_span"), |b| {
+        let span = span!(Level::TRACE, "span");
+        b.iter(|| {
+            let _span = span.enter();
+        })
+    });
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);

third-party/vendor/tracing/benches/event.rs

@@ -0,0 +1,12 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+
+mod shared;
+
+fn bench(c: &mut Criterion) {
+    shared::for_all_recording(&mut c.benchmark_group("event"), |b| {
+        b.iter(|| tracing::info!("hello world!"))
+    });
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);

third-party/vendor/tracing/benches/shared.rs

@@ -0,0 +1,160 @@
+#![allow(dead_code)]
+use criterion::{black_box, measurement::WallTime, Bencher};
+use tracing::{field, span, Event, Id, Metadata};
+
+use std::{
+    fmt::{self, Write},
+    sync::{Mutex, MutexGuard},
+};
+
+pub fn for_all_recording(
+    group: &mut criterion::BenchmarkGroup<'_, WallTime>,
+    mut iter: impl FnMut(&mut Bencher<'_, WallTime>),
+) {
+    // first, run benchmarks with no subscriber
+    group.bench_function("none", &mut iter);
+
+    // then, run benchmarks with a scoped default subscriber
+    tracing::subscriber::with_default(EnabledSubscriber, || {
+        group.bench_function("scoped", &mut iter)
+    });
+
+    let subscriber = VisitingSubscriber(Mutex::new(String::from("")));
+    tracing::subscriber::with_default(subscriber, || {
+        group.bench_function("scoped_recording", &mut iter);
+    });
+
+    // finally, set a global default subscriber, and run the benchmarks again.
+    tracing::subscriber::set_global_default(EnabledSubscriber)
+        .expect("global default should not have already been set!");
+    let _ = log::set_logger(&NOP_LOGGER);
+    log::set_max_level(log::LevelFilter::Trace);
+    group.bench_function("global", &mut iter);
+}
+
+pub fn for_all_dispatches(
+    group: &mut criterion::BenchmarkGroup<'_, WallTime>,
+    mut iter: impl FnMut(&mut Bencher<'_, WallTime>),
+) {
+    // first, run benchmarks with no subscriber
+    group.bench_function("none", &mut iter);
+
+    // then, run benchmarks with a scoped default subscriber
+    tracing::subscriber::with_default(EnabledSubscriber, || {
+        group.bench_function("scoped", &mut iter)
+    });
+
+    // finally, set a global default subscriber, and run the benchmarks again.
+    tracing::subscriber::set_global_default(EnabledSubscriber)
+        .expect("global default should not have already been set!");
+    let _ = log::set_logger(&NOP_LOGGER);
+    log::set_max_level(log::LevelFilter::Trace);
+    group.bench_function("global", &mut iter);
+}
+
+const NOP_LOGGER: NopLogger = NopLogger;
+
+struct NopLogger;
+
+impl log::Log for NopLogger {
+    fn enabled(&self, _metadata: &log::Metadata) -> bool {
+        true
+    }
+
+    fn log(&self, record: &log::Record) {
+        if self.enabled(record.metadata()) {
+            let mut this = self;
+            let _ = write!(this, "{}", record.args());
+        }
+    }
+
+    fn flush(&self) {}
+}
+
+impl Write for &NopLogger {
+    fn write_str(&mut self, s: &str) -> std::fmt::Result {
+        black_box(s);
+        Ok(())
+    }
+}
+
+/// Simulates a subscriber that records span data.
+struct VisitingSubscriber(Mutex<String>);
+
+struct Visitor<'a>(MutexGuard<'a, String>);
+
+impl<'a> field::Visit for Visitor<'a> {
+    fn record_debug(&mut self, _field: &field::Field, value: &dyn fmt::Debug) {
+        let _ = write!(&mut *self.0, "{:?}", value);
+    }
+}
+
+impl tracing::Subscriber for VisitingSubscriber {
+    fn new_span(&self, span: &span::Attributes<'_>) -> Id {
+        let mut visitor = Visitor(self.0.lock().unwrap());
+        span.record(&mut visitor);
+        Id::from_u64(0xDEAD_FACE)
+    }
+
+    fn record(&self, _span: &Id, values: &span::Record<'_>) {
+        let mut visitor = Visitor(self.0.lock().unwrap());
+        values.record(&mut visitor);
+    }
+
+    fn event(&self, event: &Event<'_>) {
+        let mut visitor = Visitor(self.0.lock().unwrap());
+        event.record(&mut visitor);
+    }
+
+    fn record_follows_from(&self, span: &Id, follows: &Id) {
+        let _ = (span, follows);
+    }
+
+    fn enabled(&self, metadata: &Metadata<'_>) -> bool {
+        let _ = metadata;
+        true
+    }
+
+    fn enter(&self, span: &Id) {
+        let _ = span;
+    }
+
+    fn exit(&self, span: &Id) {
+        let _ = span;
+    }
+}
+
+/// A subscriber that is enabled but otherwise does nothing.
+struct EnabledSubscriber;
+
+impl tracing::Subscriber for EnabledSubscriber {
+    fn new_span(&self, span: &span::Attributes<'_>) -> Id {
+        let _ = span;
+        Id::from_u64(0xDEAD_FACE)
+    }
+
+    fn event(&self, event: &Event<'_>) {
+        let _ = event;
+    }
+
+    fn record(&self, span: &Id, values: &span::Record<'_>) {
+        let _ = (span, values);
+    }
+
+    fn record_follows_from(&self, span: &Id, follows: &Id) {
+        let _ = (span, follows);
+    }
+
+    fn enabled(&self, metadata: &Metadata<'_>) -> bool {
+        let _ = metadata;
+        true
+    }
+
+    fn enter(&self, span: &Id) {
+        let _ = span;
+    }
+
+    fn exit(&self, span: &Id) {
+        let _ = span;
+    }
+}

third-party/vendor/tracing/benches/span_fields.rs

@@ -0,0 +1,23 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use tracing::{span, Level};
+
+mod shared;
+
+fn bench(c: &mut Criterion) {
+    shared::for_all_recording(&mut c.benchmark_group("span_fields"), |b| {
+        b.iter(|| {
+            let span = span!(
+                Level::TRACE,
+                "span",
+                foo = "foo",
+                bar = "bar",
+                baz = 3,
+                quuux = tracing::field::debug(0.99)
+            );
+            criterion::black_box(span)
+        })
+    });
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);

third-party/vendor/tracing/benches/span_no_fields.rs

@@ -0,0 +1,13 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use tracing::{span, Level};
+
+mod shared;
+
+fn bench(c: &mut Criterion) {
+    shared::for_all_recording(&mut c.benchmark_group("span_no_fields"), |b| {
+        b.iter(|| span!(Level::TRACE, "span"))
+    });
+}
+
+criterion_group!(benches, bench);
+criterion_main!(benches);

third-party/vendor/tracing/benches/span_repeated.rs

@@ -0,0 +1,20 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use tracing::{span, Level};
+
+mod shared;
+
+fn bench(c: &mut Criterion) {
+    shared::for_all_recording(&mut c.benchmark_group("span_repeated"), |b| {
+        let n = black_box(N_SPANS);
+        b.iter(|| (0..n).fold(mk_span(0), |_, i| mk_span(i as u64)))
+    });
+}
+
+#[inline]
+fn mk_span(i: u64) -> tracing::Span {
+    span!(Level::TRACE, "span", i = i)
+}
+
+const N_SPANS: usize = 100;
+criterion_group!(benches, bench);
+criterion_main!(benches);