On 12/19/2011 11:24 AM, KOSAKI Motohiro wrote: > (12/19/11 1:38 PM), 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. >> >> Signed-off-by: Naoya Horiguchi<n-horiguchi@xxxxxxxxxxxxx> > > NAK. > > The detail of transparent hugepage are hidden by design. We hope it > keep 'transparent'. > Until any explain why we should expose KPF_THP, we don't agree it. Transparent shouldn't mean "undebuggable", though. :) Let's say you profiled a application and the data shows you're missing the TLB a bunch, but you're also using THP. This might give you a shot at figuring out which parts of your application are *TRULY* THP-backed instead of just the areas you *think* are backed. I'm not sure there's another way to figure it out at the moment. -- 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>