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Message-ID: <1364421508-fjm1vfw0-mutt-n-horiguchi@ah.jp.nec.com> Date: Wed, 27 Mar 2013 17:58:28 -0400 From: Naoya Horiguchi <n-horiguchi@...jp.nec.com> To: Michal Hocko <mhocko@...e.cz> Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>, Mel Gorman <mel@....ul.ie>, Hugh Dickins <hughd@...gle.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Andi Kleen <andi@...stfloor.org>, Hillf Danton <dhillf@...il.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 09/10] memory-hotplug: enable memory hotplug to handle hugepage On Wed, Mar 27, 2013 at 05:29:19PM -0400, Naoya Horiguchi wrote: ... > > If we made sure that all page on the hugepage_freelists have reference > > 0 (which is now not the case and it is yet another source of confusion) > > then the whole loop could be replaced by page_count check. > > I think that free hugepages have refcount 0, but hwpoisoned hugepages > have also refcount 0. But hwpoison can happen only on limited hardware > and we consider them as exceptional, so replacing page_count check and > checking PG_hwpoisoned flag looks more reasonable to me. Sorry, my mistake. Hwpoisoned hugepages have refcount 1, so there's no problem on using page_count check. Naoya -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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