io_uring_slowpath.bt

io_uring_slowpath.bt

#!/usr/bin/env bpftrace

BEGIN
{
    printf("tracing io_uring fast vs slow path...\n");
}

tracepoint:io_uring:io_uring_submit_req
{
    @submitted[comm] = count();
}

tracepoint:io_uring:io_uring_queue_async_work
{
    @slow_path[comm] = count();
}

interval:s:5
{
    printf("\n-- io_uring stats (last 5s) --\n");

    for ($kv : @submitted) {
        $submitted_sqe = @submitted[$kv.0];
        $slow = @slow_path[$kv.0];
        $fast = $submitted_sqe - $slow;
        printf("%s: total=%d, fast=%d, slow=%d\n", $kv.0, $submitted_sqe, $fast, $slow);
    }

    clear(@submitted);
    clear(@slow_path);
}