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Bug 1906853 - add glean probe for http3 udp datagram size r=necko-rev…
…iewers,kershaw,janerik This commit adds four Glean probes: - http3_udp_datagram_segment_size_sent - http3_udp_datagram_segment_size_received - http3_udp_datagram_size_received - http3_udp_datagram_num_segments_received Given the performance impact tracking Glean metrics in the UDP hot path, see https://phabricator.services.mozilla.com/D216034#7453056, this commit introduces a sample buffer per metric. This will enable us to measure the impact of: - Implementation of Packetization Layer Path MTU Discovery for Datagram Transports (RFC 8899) [in Neqo](mozilla/neqo#1903) - [Fast UDP for Firefox](https://bugzilla.mozilla.org/show_bug.cgi?id=1901292) Differential Revision: https://phabricator.services.mozilla.com/D216034
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,96 @@ | ||
| /* This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at https://mozilla.org/MPL/2.0/. */ | ||
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| use std::cell::RefCell; | ||
| #[cfg(not(target_os = "android"))] | ||
| use std::convert::{TryFrom, TryInto}; | ||
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| use firefox_on_glean::metrics::networking as glean; | ||
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| #[cfg(not(target_os = "android"))] | ||
| const BUFFER_SIZE: usize = 1024; | ||
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| std::thread_local! { | ||
| pub static METRICS: RefCell<BufferedMetrics> = RefCell::new(BufferedMetrics::default()); | ||
| } | ||
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| #[allow(dead_code)] | ||
| pub struct BufferedMetric<S> { | ||
| buffer: Vec<S>, | ||
| sync: fn(Vec<S>), | ||
| } | ||
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| impl<S> BufferedMetric<S> { | ||
| fn new(f: fn(Vec<S>)) -> Self { | ||
| Self { | ||
| buffer: vec![], | ||
| sync: f, | ||
| } | ||
| } | ||
| } | ||
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| #[cfg(not(target_os = "android"))] | ||
| impl<S: TryFrom<usize>> BufferedMetric<S> { | ||
| pub fn sample(&mut self, sample: usize) { | ||
| let Ok(sample) = sample.try_into() else { | ||
| neqo_common::qdebug!("failed to convert {sample} to metric's sample type"); | ||
| return; | ||
| }; | ||
| self.buffer.push(sample); | ||
| if self.buffer.len() == BUFFER_SIZE { | ||
| self.sync_to_glean(); | ||
| } | ||
| } | ||
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| fn sync_to_glean(&mut self) { | ||
| if !self.buffer.is_empty() { | ||
| (self.sync)(std::mem::take(&mut self.buffer)); | ||
| } | ||
| } | ||
| } | ||
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| // Noop on Android for now, due to performance regressions. | ||
| // - <https://bugzilla.mozilla.org/show_bug.cgi?id=1898810> | ||
| // - <https://bugzilla.mozilla.org/show_bug.cgi?id=1906664> | ||
| #[cfg(target_os = "android")] | ||
| impl<S> BufferedMetric<S> { | ||
| pub fn sample(&mut self, _sample: usize) {} | ||
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| fn sync_to_glean(&mut self) {} | ||
| } | ||
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| pub struct BufferedMetrics { | ||
| pub datagram_segment_size_sent: BufferedMetric<u64>, | ||
| pub datagram_segment_size_received: BufferedMetric<u64>, | ||
| pub datagram_size_received: BufferedMetric<u64>, | ||
| pub datagram_segments_received: BufferedMetric<i64>, | ||
| } | ||
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| impl Default for BufferedMetrics { | ||
| fn default() -> Self { | ||
| Self { | ||
| datagram_segment_size_sent: BufferedMetric::new(|samples| { | ||
| glean::http_3_udp_datagram_segment_size_sent.accumulate_samples(samples) | ||
| }), | ||
| datagram_segment_size_received: BufferedMetric::new(|samples| { | ||
| glean::http_3_udp_datagram_segment_size_received.accumulate_samples(samples) | ||
| }), | ||
| datagram_size_received: BufferedMetric::new(|samples| { | ||
| glean::http_3_udp_datagram_size_received.accumulate_samples(samples) | ||
| }), | ||
| datagram_segments_received: BufferedMetric::new(|samples| { | ||
| glean::http_3_udp_datagram_segments_received.accumulate_samples_signed(samples) | ||
| }), | ||
| } | ||
| } | ||
| } | ||
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| impl BufferedMetrics { | ||
| pub fn sync_to_glean(&mut self) { | ||
| self.datagram_segment_size_sent.sync_to_glean(); | ||
| self.datagram_segment_size_received.sync_to_glean(); | ||
| self.datagram_size_received.sync_to_glean(); | ||
| self.datagram_segments_received.sync_to_glean(); | ||
| } | ||
| } |