On Tue, Feb 27, 2007 at 05:58:14PM +0100, Eric Dumazet ([EMAIL PROTECTED]) wrote: > I believe one advantage of epoll is it uses standard mechanism (mandated for > poll()/select() ), while kevent adds some glue and kevent_storage in some > structures (struct inode, struct file, ...), thus adding some extra code and > extra storage in hot paths. Yes there might be a gain IF most users of these > path want kevent. But other users pay the price (larger kernel code and > data), that you cannot easily bench. > > Using or not epoll has nearly zero cost over standard kernel (only struct > file > has some extra storage)
Well, that's a price - any event which wants to be supported needs to store for events - kevent_storage is a list_head plus spinlock and pointer to itself (with all current users that pointer can be removed and access transferred to container_of()) - it is exactly as in epoll storage - both were created with the smallest possible overhead in mind. -- Evgeniy Polyakov - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/