From: Michal Hocko <mhocko@suse.cz>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>, Hugh Dickins <hughd@google.com>,
Rik van Riel <riel@redhat.com>,
Konstantin Khlebnikov <khlebnikov@openvz.org>,
HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 3/3] hugetlbfs: add swap entry check in follow_hugetlb_page()
Date: Wed, 10 Apr 2013 10:07:06 +0200 [thread overview]
Message-ID: <20130410080706.GA20998@dhcp22.suse.cz> (raw)
In-Reply-To: <1365544834-c6v2jpoo-mutt-n-horiguchi@ah.jp.nec.com>
On Tue 09-04-13 18:00:34, Naoya Horiguchi wrote:
[...]
> I rewrite the comment here, how about this?
>
> - if (absent ||
> + /*
> + * We need call hugetlb_fault for both hugepages under migration
> + * (in which case hugetlb_fault waits for the migration,) and
> + * hwpoisoned hugepages (in which case we need to prevent the
> + * caller from accessing to them.) In order to do this, we use
> + * here is_swap_pte instead of is_hugetlb_entry_migration and
> + * is_hugetlb_entry_hwpoisoned. This is because it simply covers
> + * both cases, and because we can't follow correct pages directly
> + * from any kind of swap entries.
> + */
> + if (absent || is_swap_pte(huge_ptep_get(pte)) ||
> ((flags & FOLL_WRITE) && !pte_write(huge_ptep_get(pte)))) {
> int ret;
OK, thanks!
--
Michal Hocko
SUSE Labs
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prev parent reply other threads:[~2013-04-10 8:07 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-03 18:35 [PATCH v3 0/3] fix hugepage coredump Naoya Horiguchi
2013-04-03 18:35 ` [PATCH v3 1/3] hugetlbfs: stop setting VM_DONTDUMP in initializing vma(VM_HUGETLB) Naoya Horiguchi
2013-04-03 19:20 ` Rik van Riel
2013-04-05 18:32 ` KOSAKI Motohiro
2013-04-05 18:40 ` Naoya Horiguchi
2013-04-03 18:35 ` [PATCH v3 2/3] fix hugetlb memory check in vma_dump_size() Naoya Horiguchi
2013-04-03 19:22 ` Rik van Riel
2013-04-03 21:14 ` Michal Hocko
2013-04-04 0:42 ` HATAYAMA Daisuke
2013-04-05 18:33 ` KOSAKI Motohiro
2013-04-03 18:35 ` [PATCH v3 3/3] hugetlbfs: add swap entry check in follow_hugetlb_page() Naoya Horiguchi
2013-04-03 20:01 ` Rik van Riel
2013-04-05 18:59 ` KOSAKI Motohiro
2013-04-08 19:27 ` Naoya Horiguchi
2013-04-08 20:57 ` KOSAKI Motohiro
2013-04-09 22:00 ` Naoya Horiguchi
2013-04-10 1:53 ` KOSAKI Motohiro
2013-04-10 8:07 ` Michal Hocko [this message]
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