Jan Kara <jack@xxxxxxx> writes: >> Did you already consider, to copy only if page was writeback (like >> copy-on-write)? I.e. if page is on I/O, copy, then switch the page for >> writing new data. > Yes, that was considered as well. We'd have to essentially migrate the > page that is under writeback and should be written to. You are going to pay > the cost of page allocation, copy, increased memory & cache pressure. > Depending on your backing storage and workload this may or may not be better > than waiting for IO... Maybe possible, but you really think on usual case just blocking is better? Thanks. -- OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>