From: Christoph Lameter <cl@linux-foundation.org>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>, Wu Fengguang <fengguang.wu@intel.com>,
Jun'ichi Nomura <j-nomura@ce.jp.nec.com>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/9] Hugepage migration (v2)
Date: Mon, 16 Aug 2010 07:19:58 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1008160707420.11420@router.home> (raw)
In-Reply-To: <20100816091935.GB3388@spritzera.linux.bs1.fc.nec.co.jp>
On Mon, 16 Aug 2010, Naoya Horiguchi wrote:
> In my understanding, in current code "other processors increasing refcount
> during migration" can happen both in non-hugepage direct I/O and in hugepage
> direct I/O in the similar way (i.e. get_user_pages_fast() from dio_refill_pages()).
> So I think there is no specific problem to hugepage.
> Or am I missing your point?
With a single page there is the check of the refcount during migration
after all the references have been removed (at that point the page is no
longer mapped by any process and direct iO can no longer be
initiated without a page fault.
I see that you are running try_to_unmap() from unmap_and_move_huge_page().
I dont see a patch adding huge page support to try_to_unmap though. How
does this work?
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next prev parent reply other threads:[~2010-08-16 12:20 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-10 9:27 Naoya Horiguchi
2010-08-10 9:27 ` [PATCH 1/9] HWPOISON, hugetlb: move PG_HWPoison bit check Naoya Horiguchi
2010-08-18 0:18 ` Wu Fengguang
2010-08-19 7:55 ` Naoya Horiguchi
2010-08-19 9:28 ` Wu Fengguang
2010-08-23 9:24 ` Naoya Horiguchi
2010-08-10 9:27 ` [PATCH 2/9] hugetlb: add allocate function for hugepage migration Naoya Horiguchi
2010-08-17 6:51 ` David Rientjes
2010-08-18 3:02 ` Naoya Horiguchi
2010-08-10 9:27 ` [PATCH 3/9] hugetlb: rename hugepage allocation functions Naoya Horiguchi
2010-08-10 9:27 ` [PATCH 4/9] hugetlb: redefine hugepage copy functions Naoya Horiguchi
2010-08-10 9:27 ` [PATCH 5/9] hugetlb: hugepage migration core Naoya Horiguchi
2010-08-10 9:27 ` [PATCH 6/9] HWPOISON, hugetlb: soft offlining for hugepage Naoya Horiguchi
2010-08-10 9:27 ` [PATCH 7/9] HWPOISON, hugetlb: fix unpoison " Naoya Horiguchi
2010-08-10 9:27 ` [PATCH 8/9] page-types.c: fix name of unpoison interface Naoya Horiguchi
2010-08-19 1:24 ` Wu Fengguang
2010-08-10 9:27 ` [PATCH 9/9] hugetlb: add corrupted hugepage counter Naoya Horiguchi
2010-08-19 1:57 ` Wu Fengguang
2010-08-24 3:01 ` Naoya Horiguchi
2010-08-24 3:08 ` Wu Fengguang
2010-08-11 13:09 ` [PATCH 0/9] Hugepage migration (v2) Christoph Lameter
2010-08-12 7:53 ` Naoya Horiguchi
2010-08-12 7:57 ` [RFC] [PATCH 1/4] hugetlb: prepare exclusion control functions for hugepage Naoya Horiguchi
2010-08-12 7:59 ` [RFC] [PATCH 2/4] dio: add page locking for direct I/O Naoya Horiguchi
2010-08-12 13:42 ` Jeff Moyer
2010-08-16 2:07 ` Naoya Horiguchi
2010-08-16 7:21 ` Andi Kleen
2010-08-16 13:20 ` Jeff Moyer
2010-08-17 8:17 ` Naoya Horiguchi
2010-08-17 13:46 ` Jeff Moyer
2010-08-17 14:21 ` Andi Kleen
2010-08-17 16:41 ` Christoph Lameter
2010-08-12 8:00 ` [PATCH 3/4] HWPOISON: replace locking functions into hugepage variants Naoya Horiguchi
2010-08-12 8:00 ` [PATCH 4/4] correct locking functions of hugepage migration routine Naoya Horiguchi
2010-08-13 12:47 ` [PATCH 0/9] Hugepage migration (v2) Christoph Lameter
2010-08-16 9:19 ` Naoya Horiguchi
2010-08-16 12:19 ` Christoph Lameter [this message]
2010-08-17 2:37 ` Naoya Horiguchi
2010-08-17 8:18 ` Naoya Horiguchi
2010-08-17 9:40 ` Andi Kleen
2010-08-18 7:32 ` Naoya Horiguchi
2010-08-18 7:46 ` Andi Kleen
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