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Date: Thu, 21 Mar 2013 07:36:53 +0800 From: Simon Jeons <simon.jeons@...il.com> To: Naoya Horiguchi <n-horiguchi@...jp.nec.com> 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>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/9] migrate: add migrate_entry_wait_huge() Hi Naoya, On 03/21/2013 05:53 AM, Naoya Horiguchi wrote: > On Wed, Mar 20, 2013 at 07:57:32AM +0800, Simon Jeons wrote: >> Hi Naoya, >> On 02/22/2013 03:41 AM, Naoya Horiguchi wrote: >>> When we have a page fault for the address which is backed by a hugepage >>> under migration, the kernel can't wait correctly until the migration >>> finishes. This is because pte_offset_map_lock() can't get a correct >> It seems that current hugetlb_fault still wait hugetlb page under >> migration, how can it work without lock 2MB memory? > Hugetlb_fault() does call migration_entry_wait(), but returns immediately. Could you point out to me which code in function migration_entry_wait() lead to return immediately? > So page fault happens over and over again until the migration completes. > IOW, migration_entry_wait() is now broken for hugepage and doesn't work > as expected. > > Thanks, > 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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