Function pmu_x86::start_samples

pub fn start_samples(
    event_type: EventType,
    event_per_sample: u32,
    task_id: Option<usize>,
    sample_count: u32
) -> Result<(), &'static str>

Start interrupt process in order to take samples using the PMU. It loads the starting value as such that an overflow will occur at “event_per_sample” events. That overflow triggers an interrupt where information about the current running task is sampled.

Arguments

• event_type: determines type of event that sampling interval is based on
• event_per_sample: how many of those events should occur between each sample
• task_id: allows the user to choose to only sample from a specific task by inputting a number or sample from all tasks by inputting None
• sample_count: specifies how many samples should be recorded.

Note

The function clears any previous values from sampling stored for this core, so values must be retrieved before starting a new sampling process. Currently can only sample “this” core - core that the function was called on.