Minchan, > A few month ago, I saw your patch about enhancing readahead. > At that time, many guys tested several size of USB and SSD which are > consist of nand device. > The result is good if we does readahead untile some crossover point. > So I think we need readahead about file I/O in non-rotation device, too. > > But startup latency is important than file I/O performance in some machine. > With analysis at that time, code readahead of application affected slow startup. > In addition, during bootup, cache hit ratio was very small. > > So I hoped we can disable readahead just only code section(ie, roughly > exec vma's filemap fault). :) > > I don't want you to solve this problem right now. > Just let you understand embedded system's some problem > for enhancing readahead in future. :) Yeah, I've never heard of such a demand, definitely good to know it! Thanks, Fengguang -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>