Hi Minchan, Thank you for taking a look at this patch set. On Wed, Apr 29, 2015 at 12:57:22PM +0900, Minchan Kim wrote: > On Tue, Apr 28, 2015 at 03:24:39PM +0300, Vladimir Davydov wrote: > > * /proc/kpageidle. For each page this file contains a 64-bit number, which > > equals 1 if the page is idle or 0 otherwise, indexed by PFN. A page is > > Why do we need 64bit per page to indicate just idle or not? I don't think we need this, actually. I made this file 64 bit per page only to conform to other /proc/kpage* files. Currently, I can't think of any potential use for residual 63 bits, so personally I'm fine with 1 bit per page. If nobody comes with an idea about how > 1 bits could be used, I'll switch /proc/kpageidle to a bitmask in the next iteration. Thanks, Vladimir -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>