why delta only include the execution time of ngx_process_events not ngx_event_process_posted (Zhang Chao)

[yang chen]

Thanks for your reply, why calling the ngx_event_expire_timers is
unnecessary when ngx_process_events handler returns so quickly that the
millisecond precision is not enough to display the calling time(less than
1ms maybe).

ngx_process_events handler returns quickly which doesn't
mean ngx_event_process_posted return quickly, maybe it excute for 2 ms or
more
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