From: Michal Hocko <mhocko@kernel.org>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page
Date: Tue, 3 Apr 2018 09:59:28 +0200 [thread overview]
Message-ID: <20180403075928.GC5501@dhcp22.suse.cz> (raw)
In-Reply-To: <1522730788-24530-1-git-send-email-n-horiguchi@ah.jp.nec.com>
On Tue 03-04-18 13:46:28, Naoya Horiguchi wrote:
> My testing for the latest kernel supporting thp migration found out an
> infinite loop in offlining the memory block that is filled with shmem
> thps. We can get out of the loop with a signal, but kernel should
> return with failure in this case.
>
> What happens in the loop is that scan_movable_pages() repeats returning
> the same pfn without any progress. That's because page migration always
> fails for shmem thps.
Why does it fail? Shmem pages should be movable without any issues.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2018-04-03 7:59 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-03 4:46 Naoya Horiguchi
2018-04-03 7:59 ` Michal Hocko [this message]
2018-04-03 8:24 ` Naoya Horiguchi
2018-04-03 8:34 ` Michal Hocko
2018-04-03 10:54 ` Kirill A. Shutemov
2018-04-03 10:58 ` Michal Hocko
2018-04-03 11:16 ` Kirill A. Shutemov
2018-04-03 11:33 ` Michal Hocko
2018-04-05 8:59 ` Michal Hocko
2018-04-05 12:28 ` Kirill A. Shutemov
2018-04-05 12:48 ` Michal Hocko
2018-04-05 13:40 ` Kirill A. Shutemov
2018-04-05 15:05 ` Michal Hocko
2018-04-05 15:55 ` Kirill A. Shutemov
2018-04-05 16:03 ` Michal Hocko
2018-04-05 17:58 ` Zi Yan
2018-04-05 19:04 ` Michal Hocko
2018-04-05 19:09 ` Zi Yan
2018-04-06 3:07 ` [PATCH] mm: shmem: enable thp migration (Re: [PATCH v1] mm: consider non-anonymous thp as unmovable page) Naoya Horiguchi
2018-04-06 5:14 ` Naoya Horiguchi
2018-04-06 7:08 ` Michal Hocko
2018-04-09 7:14 ` Naoya Horiguchi
2018-04-10 11:16 ` Kirill A. Shutemov
2018-04-11 9:26 ` Michal Hocko
2018-04-11 19:27 ` Andrew Morton
2018-04-11 19:43 ` Michal Hocko
2018-04-23 3:03 ` Matthew Wilcox
2018-04-23 7:21 ` Naoya Horiguchi
2018-04-05 16:42 ` [PATCH v1] mm: consider non-anonymous thp as unmovable page Sasha Levin
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