src/chromiumos/tast/local/bundles/cros/ui/data/perfetto/system_trace_config.pbtxt

# This is inspired from the internal config: go/perfetto-aot-merged-config, docs/long-traces.md

# Enable periodic flushing of the trace buffer into the output file.
write_into_file: true

# Max duration: 30 mins.
duration_ms: 1800000

# Writes the userspace buffer into the file every 2 seconds.
# The data rate of a typical trace is ~1-4 MB/s. So a 8MB in-memory buffer can hold for up
# write periods of ~2 seconds before starting to lose data.
# See https://perfetto.dev/docs/concepts/config#long-traces.
file_write_period_ms: 2000

# We need to guarantee that events stay within some defined sorting window (for the importer).
flush_period_ms: 20000

# Stops the tracing session after 300,000,000 bytes have been written.
max_file_size_bytes: 300000000

# Buffer 0: for process stats, system stats.
buffers {
    size_kb: 7168
    fill_policy: RING_BUFFER
}

# Buffer 1: for ftrace.
buffers {
    size_kb: 7168
    fill_policy: RING_BUFFER
}

# Buffer 2: for chromium trace and metadata.
buffers {
    size_kb: 14336
    fill_policy: RING_BUFFER
}

# Scheduling details.
data_sources: {
    config {
        name: "linux.process_stats"
        target_buffer: 0
        process_stats_config {
            scan_all_processes_on_start: true
            proc_stats_poll_ms: 1000
        }
    }
}

# Coarse CPU usage counter, kernel meminfo and virtual memory stats.
data_sources: {
    config {
        name: "linux.sys_stats"
        target_buffer: 0
        sys_stats_config {
            meminfo_period_ms: 1000
            vmstat_period_ms: 1000
            stat_period_ms: 1000
            stat_counters: STAT_CPU_TIMES
            stat_counters: STAT_FORK_COUNT
        }
    }
}

# Ftrace.
data_sources: {
    config {
        name: "linux.ftrace"
        target_buffer: 1
        ftrace_config {
            # Enables symbol name resolution against /proc/kallsyms.
            symbolize_ksyms: true

            # Scheduling information & process tracking. Useful for:
            # - what is happening on each CPU at each moment
            # - why a thread was descheduled
            # - parent/child relationships between processes and threads.
            ftrace_events: "power/suspend_resume"
            ftrace_events: "sched/sched_blocked_reason"
            ftrace_events: "sched/sched_process_free"
            ftrace_events: "sched/sched_switch"
            ftrace_events: "task/task_newtask"
            ftrace_events: "task/task_rename"

            # User process page faults.
            ftrace_events: "exceptions/page_fault_user"

            # Wakeup info. Allows you to compute how long a task was
            # blocked due to CPU contention.
            ftrace_events: "sched/sched_waking"
            ftrace_events: "sched/sched_wakeup_new"

            # Cpu events.
            ftrace_events: "power/cpu_frequency"
            ftrace_events: "power/cpu_idle"

            compact_sched {
                # When enabled, specific high-volume events are encoded in a denser format than normal.
                enabled: true
            }
        }
    }
}

# Chrome trace events.
data_sources: {
    config {
        name: "org.chromium.trace_event"
        target_buffer: 0
        chrome_config {
            # Categories: toplevel, cc, gpu, viz, ui, views, benchmark, input, memory-infra.
            trace_config: "{\"record_mode\":\"record-until-full\",\"included_categories\":[\"toplevel\",\"cc\",\"gpu\",\"viz\",\"ui\",\"views\",\"benchmark\",\"input\",\"memory-infra\"],\"memory_dump_config\":{}}"
            # When enabled, the data source should only fill in fields in the output that are not potentially privacy sensitive.
            privacy_filtering_enabled: false
            # Don't convert the trace data to the legacy JSON format.
            convert_to_legacy_json: false
            # Priority of the tracing session client.
            client_priority: UNKNOWN
        }
    }
}

# Chrome trace metadata.
data_sources: {
    config {
        name: "org.chromium.trace_metadata"
        target_buffer: 0
        chrome_config {
            # Categories: toplevel, cc, gpu, viz, ui, views, benchmark, input, memory-infra.
            trace_config: "{\"record_mode\":\"record-until-full\",\"included_categories\":[\"toplevel\",\"cc\",\"gpu\",\"viz\",\"ui\",\"views\",\"benchmark\",\"input\",\"memory-infra\"],\"memory_dump_config\":{}}"
            # When enabled, the data source should only fill in fields in the output that are not potentially privacy sensitive.
            privacy_filtering_enabled: false
            # Don't convert the trace data to the legacy JSON format.
            convert_to_legacy_json: false
            # Priority of the tracing session client.
            client_priority: UNKNOWN
        }
    }
}