Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 20 Dec 2011 13:10:41 -0500 | From | Naoya Horiguchi <> | Subject | Re: [RFC][PATCH 2/3] pagemap: export KPF_THP |
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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@ah.jp.nec.com> > > Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>
Thank you.
Naoya
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