Struct TracePerformanceEventManager 

pub struct TracePerformanceEventManager { /* private fields */ }

Implementations

impl TracePerformanceEventManager

pub fn new() -> Self

pub fn start(&mut self, kernel: &Arc<Kernel>)

Registers the map with the pid_table so the pid/tid to koid mappings can be recorded when new threads are created. Since processing the trace events could be done past a thread’s lifetime, no mappings are removed when a thread or process exits. Additional work may be needed to handle pid reuse (https://fxbug.dev/322874557), currently new mapping information overwrites existing mappings.

Calling |start| when this instance has already been started will panic.

NOTE: This will record all thread and process mappings until |stop| is called. The mapping will continue to exist in memory until |clear| is called. It is expected that this is a relatively short period of time, such as the time during capturing a performance trace.

pub fn stop(&mut self)

Clears the pid to koid map reference in the kernel passed in to |start|. Stop is a no-op if start has not been called, or if stop has already been called.

pub fn clear(&mut self)

Clears the pid-koid map. After starting, call |load_pid_mappings| to initialize the table with existing task/process data.

pub fn map_pid_to_koid(&mut self, pid: pid_t) -> Koid

Maps a “pid” to the koid. This is also referred to as the “Process Id” in Perfetto terms.

pub fn map_tid_to_koid(&mut self, tid: tid_t) -> Koid

Maps a “tid” to the koid. This is also referred to as the “Thread Id” in Perfetto terms.

Trait Implementations

impl Drop for TracePerformanceEventManager

fn drop(&mut self)

Executes the destructor for this type.