On Tue, Dec 20, 2011 at 11:35:37AM +0800, Wu Fengguang wrote: > On Tue, Dec 20, 2011 at 02:38:38AM +0800, Naoya Horiguchi wrote: > > This flag shows that a given pages is a subpage of transparent hugepage. > > It does not care about whether it is a head page or a tail page, because > > it's clear from pfn of the target page which you should know when you read > > /proc/kpageflags. > > OK, this is aligning with KPF_HUGE. For those who only care about > head/tail pages, will the KPF_COMPOUND_HEAD/KPF_COMPOUND_TAIL flags be > set automatically for thp? Which may be more convenient to test/filter > than the page address. Yes, both of KPF_COMPOUND_HEAD/TAIL flags are automatically set for thp. So above patch description was wrong and should be fixed. (I didn't notice that because page-types hid compound_head/tail flags without --raw flag. Sorry for confusion.) > > Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> > > Reviewed-by: Wu Fengguang <fengguang.wu@xxxxxxxxx> Thank you. Naoya -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>