From: Vlastimil Babka <vbabka@suse.cz>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>,
Rik van Riel <riel@redhat.com>, Christoph Lameter <cl@gentwo.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Steve Capper <steve.capper@linaro.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>,
Jerome Marchand <jmarchan@redhat.com>,
Sasha Levin <sasha.levin@oracle.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCHv6 13/36] mm: drop tail page refcounting
Date: Tue, 09 Jun 2015 15:59:40 +0200 [thread overview]
Message-ID: <5576F14C.8080303@suse.cz> (raw)
In-Reply-To: <1433351167-125878-14-git-send-email-kirill.shutemov@linux.intel.com>
On 06/03/2015 07:05 PM, Kirill A. Shutemov wrote:
> Tail page refcounting is utterly complicated and painful to support.
>
> It uses ->_mapcount on tail pages to store how many times this page is
> pinned. get_page() bumps ->_mapcount on tail page in addition to
> ->_count on head. This information is required by split_huge_page() to
> be able to distribute pins from head of compound page to tails during
> the split.
>
> We will need ->_mapcount acoount PTE mappings of subpages of the
to account
> compound page. We eliminate need in current meaning of ->_mapcount in
> tail pages by forbidding split entirely if the page is pinned.
>
> The only user of tail page refcounting is THP which is marked BROKEN for
> now.
>
> Let's drop all this mess. It makes get_page() and put_page() much
> simpler.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Tested-by: Sasha Levin <sasha.levin@oracle.com>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>
next prev parent reply other threads:[~2015-06-09 13:59 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-03 17:05 [PATCHv6 00/36] THP refcounting redesign Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 01/36] mm, proc: adjust PSS calculation Kirill A. Shutemov
2015-06-09 12:29 ` Vlastimil Babka
2015-06-22 10:02 ` Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 02/36] rmap: add argument to charge compound page Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 03/36] memcg: adjust to support new THP refcounting Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 04/36] mm, thp: adjust conditions when we can reuse the page on WP fault Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 05/36] mm: adjust FOLL_SPLIT for new refcounting Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 06/36] mm: handle PTE-mapped tail pages in gerneric fast gup implementaiton Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 07/36] thp, mlock: do not allow huge pages in mlocked area Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 08/36] khugepaged: ignore pmd tables with THP mapped with ptes Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 09/36] thp: rename split_huge_page_pmd() to split_huge_pmd() Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 10/36] mm, vmstats: new THP splitting event Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 11/36] mm: temporally mark THP broken Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 12/36] thp: drop all split_huge_page()-related code Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 13/36] mm: drop tail page refcounting Kirill A. Shutemov
2015-06-09 13:59 ` Vlastimil Babka [this message]
2015-06-03 17:05 ` [PATCHv6 14/36] futex, thp: remove special case for THP in get_futex_key Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 15/36] ksm: prepare to new THP semantics Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 16/36] mm, thp: remove compound_lock Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 17/36] arm64, thp: remove infrastructure for handling splitting PMDs Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 18/36] arm, " Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 19/36] mips, " Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 20/36] powerpc, " Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 21/36] s390, " Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 22/36] sparc, " Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 23/36] tile, " Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 24/36] x86, " Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 25/36] mm, " Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 26/36] mm: rework mapcount accounting to enable 4k mapping of THPs Kirill A. Shutemov
2015-06-10 13:47 ` Vlastimil Babka
2015-06-22 10:22 ` Kirill A. Shutemov
2015-06-03 17:05 ` [PATCHv6 27/36] mm: differentiate page_mapped() from page_mapcount() for compound pages Kirill A. Shutemov
2015-06-09 10:58 ` Kirill A. Shutemov
2015-06-10 14:34 ` Vlastimil Babka
2015-06-03 17:05 ` [PATCHv6 28/36] mm, numa: skip PTE-mapped THP on numa fault Kirill A. Shutemov
2015-06-03 17:06 ` [PATCHv6 29/36] thp: implement split_huge_pmd() Kirill A. Shutemov
2015-06-11 9:49 ` Vlastimil Babka
2015-06-22 11:14 ` Kirill A. Shutemov
2015-06-22 16:01 ` Vlastimil Babka
2015-06-03 17:06 ` [PATCHv6 30/36] thp: add option to setup migration entiries during PMD split Kirill A. Shutemov
2015-06-03 17:06 ` [PATCHv6 31/36] thp, mm: split_huge_page(): caller need to lock page Kirill A. Shutemov
2015-06-03 17:06 ` [PATCHv6 32/36] thp: reintroduce split_huge_page() Kirill A. Shutemov
2015-06-10 15:44 ` Vlastimil Babka
2015-06-22 11:28 ` Kirill A. Shutemov
2015-06-03 17:06 ` [PATCHv6 33/36] migrate_pages: try to split pages on qeueuing Kirill A. Shutemov
2015-06-11 9:27 ` Vlastimil Babka
2015-06-22 11:35 ` Kirill A. Shutemov
2015-06-03 17:06 ` [PATCHv6 34/36] thp: introduce deferred_split_huge_page() Kirill A. Shutemov
2015-06-03 17:06 ` [PATCHv6 35/36] mm: re-enable THP Kirill A. Shutemov
2015-06-03 17:06 ` [PATCHv6 36/36] thp: update documentation Kirill A. Shutemov
2015-06-11 12:30 ` Vlastimil Babka
2015-06-22 13:18 ` Kirill A. Shutemov
2015-06-22 16:07 ` Vlastimil Babka
2015-06-16 13:17 ` [PATCHv6 00/36] THP refcounting redesign Jerome Marchand
2015-06-22 13:21 ` Kirill A. Shutemov
2015-06-22 13:32 ` Jerome Marchand
2015-06-22 13:39 ` Kirill A. Shutemov
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