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// Copyright (c) Meta Platforms, Inc. and affiliates.
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2.
//! Phase 2: IRQ and Synchronization Analyzers
//!
//! Analyzers for interrupt handling, lock contention, and synchronization events
use super::perfetto_parser::{Percentiles, PerfettoTrace};
use perfetto_protos::ftrace_event::ftrace_event;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
/// IRQ Handler Analyzer - analyzes hardware interrupt handling
pub struct IrqHandlerAnalyzer;
impl IrqHandlerAnalyzer {
/// Analyze IRQ handler entry/exit events
pub fn analyze(trace: &PerfettoTrace) -> IrqAnalysisResult {
let mut irq_stats: HashMap<u32, IrqStats> = HashMap::new();
let mut per_cpu_irq: HashMap<u32, Vec<IrqEvent>> = HashMap::new();
// Track IRQ entry/exit pairs
let mut pending_entry: HashMap<(u32, u32), IrqEvent> = HashMap::new(); // (cpu, irq) -> entry event
// Scan all CPUs
for cpu in 0..trace.num_cpus() {
let events = trace.get_events_by_cpu(cpu as u32);
for event_with_idx in events {
match &event_with_idx.event.event {
Some(ftrace_event::Event::IrqHandlerEntry(entry)) => {
if let (Some(irq), Some(ts)) = (entry.irq, event_with_idx.event.timestamp) {
let irq_event = IrqEvent {
irq: irq as u32,
cpu: cpu as u32,
entry_ts: ts,
exit_ts: None,
duration_ns: None,
};
pending_entry.insert((cpu as u32, irq as u32), irq_event);
}
}
Some(ftrace_event::Event::IrqHandlerExit(exit)) => {
if let (Some(irq), Some(exit_ts)) =
(exit.irq, event_with_idx.event.timestamp)
{
if let Some(mut entry_event) =
pending_entry.remove(&(cpu as u32, irq as u32))
{
let duration = exit_ts - entry_event.entry_ts;
entry_event.exit_ts = Some(exit_ts);
entry_event.duration_ns = Some(duration);
// Update stats
let stats =
irq_stats.entry(irq as u32).or_insert_with(|| IrqStats {
irq: irq as u32,
count: 0,
total_duration_ns: 0,
durations: Vec::new(),
});
stats.count += 1;
stats.total_duration_ns += duration;
stats.durations.push(duration);
// Track per-CPU
per_cpu_irq.entry(cpu as u32).or_default().push(entry_event);
}
}
}
_ => {}
}
}
}
// Calculate percentiles for each IRQ
let mut irq_summary: Vec<IrqSummary> = irq_stats
.into_iter()
.map(|(irq, stats)| {
let percentiles = PerfettoTrace::calculate_percentiles(&stats.durations);
IrqSummary {
irq,
count: stats.count,
total_duration_ns: stats.total_duration_ns,
percentiles,
}
})
.collect();
// Sort by total time spent
irq_summary.sort_by_key(|s| std::cmp::Reverse(s.total_duration_ns));
IrqAnalysisResult {
irq_summary,
per_cpu_irq,
}
}
}
/// IPI Analyzer - analyzes Inter-Processor Interrupts
pub struct IpiAnalyzer;
impl IpiAnalyzer {
/// Analyze IPI entry/exit/raise events
pub fn analyze(trace: &PerfettoTrace) -> IpiAnalysisResult {
let mut ipi_events: Vec<IpiEvent> = Vec::new();
let mut per_cpu_ipi: HashMap<u32, Vec<IpiEvent>> = HashMap::new();
// Track IPI entry/exit pairs
let mut pending_entry: HashMap<u32, IpiEvent> = HashMap::new(); // cpu -> entry event
// Scan all CPUs
for cpu in 0..trace.num_cpus() {
let events = trace.get_events_by_cpu(cpu as u32);
for event_with_idx in events {
match &event_with_idx.event.event {
Some(ftrace_event::Event::IpiEntry(entry)) => {
if let Some(ts) = event_with_idx.event.timestamp {
let ipi_event = IpiEvent {
cpu: cpu as u32,
reason: entry.reason.clone().unwrap_or_default(),
entry_ts: ts,
exit_ts: None,
duration_ns: None,
};
pending_entry.insert(cpu as u32, ipi_event);
}
}
Some(ftrace_event::Event::IpiExit(exit)) => {
if let Some(exit_ts) = event_with_idx.event.timestamp {
if let Some(mut entry_event) = pending_entry.remove(&(cpu as u32)) {
let duration = exit_ts - entry_event.entry_ts;
entry_event.exit_ts = Some(exit_ts);
entry_event.duration_ns = Some(duration);
entry_event.reason = exit.reason.clone().unwrap_or_default();
per_cpu_ipi
.entry(cpu as u32)
.or_default()
.push(entry_event.clone());
ipi_events.push(entry_event);
}
}
}
_ => {}
}
}
}
// Calculate stats per IPI reason
let mut reason_stats: HashMap<String, IpiReasonStats> = HashMap::new();
for event in &ipi_events {
if let Some(duration) = event.duration_ns {
let stats =
reason_stats
.entry(event.reason.clone())
.or_insert_with(|| IpiReasonStats {
reason: event.reason.clone(),
count: 0,
durations: Vec::new(),
});
stats.count += 1;
stats.durations.push(duration);
}
}
let reason_summary: Vec<IpiReasonSummary> = reason_stats
.into_iter()
.map(|(reason, stats)| {
let percentiles = PerfettoTrace::calculate_percentiles(&stats.durations);
IpiReasonSummary {
reason,
count: stats.count,
percentiles,
}
})
.collect();
IpiAnalysisResult {
ipi_events,
per_cpu_ipi,
reason_summary,
}
}
}
// ============================================================================
// Data Structures
// ============================================================================
/// IRQ event with entry/exit timing
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IrqEvent {
pub irq: u32,
pub cpu: u32,
pub entry_ts: u64,
pub exit_ts: Option<u64>,
pub duration_ns: Option<u64>,
}
/// IRQ statistics (internal)
struct IrqStats {
#[allow(dead_code)]
irq: u32,
count: usize,
total_duration_ns: u64,
durations: Vec<u64>,
}
/// IRQ summary with percentiles
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IrqSummary {
pub irq: u32,
pub count: usize,
pub total_duration_ns: u64,
pub percentiles: Percentiles,
}
/// IRQ analysis result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IrqAnalysisResult {
pub irq_summary: Vec<IrqSummary>,
pub per_cpu_irq: HashMap<u32, Vec<IrqEvent>>,
}
/// IPI event
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IpiEvent {
pub cpu: u32,
pub reason: String,
pub entry_ts: u64,
pub exit_ts: Option<u64>,
pub duration_ns: Option<u64>,
}
/// IPI reason statistics (internal)
struct IpiReasonStats {
#[allow(dead_code)]
reason: String,
count: usize,
durations: Vec<u64>,
}
/// IPI reason summary
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IpiReasonSummary {
pub reason: String,
pub count: usize,
pub percentiles: Percentiles,
}
/// IPI analysis result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IpiAnalysisResult {
pub ipi_events: Vec<IpiEvent>,
pub per_cpu_ipi: HashMap<u32, Vec<IpiEvent>>,
pub reason_summary: Vec<IpiReasonSummary>,
}
#[cfg(test)]
mod tests {
#[test]
fn test_irq_analyzer_empty_trace() {
// Test with mock empty trace would go here
// For now, this is a placeholder
}
#[test]
fn test_ipi_analyzer_empty_trace() {
// Test with mock empty trace would go here
}
}