On Sun, Apr 16, 2023 at 07:31:55PM +0800, wenyang.linux@xxxxxxxxxxx wrote: > +eventfd_wakeup_delay_msec > +------------------ Please match the section underline length as the section text above. > +Frequent writing of an eventfd can also lead to frequent wakeup of the peer > +read process, resulting in significant cpu overhead. > +How ever for the NON SEMAPHORE eventfd, if it's counter has a nonzero value, > +then a read(2) returns 8 bytes containing that value, and the counter's value reading eventfd? > +is reset to zero. > +So it coule be optimized as follows: N event_writes vs ONE event_read. > +By adding a configurable delay after eventfd_write, these unnecessary wakeup > +operations are avoided. What is the connection from optimization you described to eventfd_write delay? Thanks. -- An old man doll... just what I always wanted! - Clara
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