From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Hugh Dickins <hughd@google.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@intel.com>,
Vlastimil Babka <vbabka@suse.cz>,
Christoph Lameter <cl@gentwo.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Jerome Marchand <jmarchan@redhat.com>,
Yang Shi <yang.shi@linaro.org>,
Sasha Levin <sasha.levin@oracle.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCHv4 04/25] rmap: support file thp
Date: Fri, 18 Mar 2016 15:10:06 +0530 [thread overview]
Message-ID: <87d1qs9lah.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <1457737157-38573-5-git-send-email-kirill.shutemov@linux.intel.com>
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> writes:
> [ text/plain ]
> Naive approach: on mapping/unmapping the page as compound we update
> ->_mapcount on each 4k page. That's not efficient, but it's not obvious
> how we can optimize this. We can look into optimization later.
>
> PG_double_map optimization doesn't work for file pages since lifecycle
> of file pages is different comparing to anon pages: file page can be
> mapped again at any time.
>
Can you explain this more ?. We added PG_double_map so that we can keep
page_remove_rmap simpler. So if it isn't a compound page we still can do
if (!atomic_add_negative(-1, &page->_mapcount))
I am trying to understand why we can't use that with file pages ?
-aneesh
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next prev parent reply other threads:[~2016-03-18 9:40 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-11 22:58 [PATCHv4 00/25] THP-enabled tmpfs/shmem Kirill A. Shutemov
2016-03-11 22:58 ` [PATCHv4 01/25] mm: do not pass mm_struct into handle_mm_fault Kirill A. Shutemov
2016-03-11 22:58 ` [PATCHv4 02/25] mm: introduce fault_env Kirill A. Shutemov
2016-03-11 22:58 ` [PATCHv4 03/25] mm: postpone page table allocation until we have page to map Kirill A. Shutemov
2016-03-11 22:58 ` [PATCHv4 04/25] rmap: support file thp Kirill A. Shutemov
2016-03-18 9:40 ` Aneesh Kumar K.V [this message]
2016-03-19 1:01 ` Kirill A. Shutemov
2016-03-11 22:58 ` [PATCHv4 05/25] mm: introduce do_set_pmd() Kirill A. Shutemov
2016-03-11 22:58 ` [PATCHv4 06/25] mm, rmap: account file thp pages Kirill A. Shutemov
2016-03-15 15:30 ` [PATCHv5 " Kirill A. Shutemov
2016-03-11 22:58 ` [PATCHv4 07/25] thp, vmstats: add counters for huge file pages Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 08/25] thp: support file pages in zap_huge_pmd() Kirill A. Shutemov
2016-03-18 13:53 ` Aneesh Kumar K.V
2016-03-19 1:02 ` Kirill A. Shutemov
2016-03-21 4:33 ` Aneesh Kumar K.V
2016-03-21 14:39 ` Kirill A. Shutemov
2016-03-21 16:42 ` Aneesh Kumar K.V
2016-03-11 22:59 ` [PATCHv4 09/25] thp: handle file pages in split_huge_pmd() Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 10/25] thp: handle file COW faults Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 11/25] thp: handle file pages in mremap() Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 12/25] thp: skip file huge pmd on copy_huge_pmd() Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 13/25] thp: prepare change_huge_pmd() for file thp Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 14/25] thp: run vma_adjust_trans_huge() outside i_mmap_rwsem Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 15/25] thp: file pages support for split_huge_page() Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 16/25] thp, mlock: do not mlock PTE-mapped file huge pages Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 17/25] vmscan: split file huge pages before paging them out Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 18/25] page-flags: relax policy for PG_mappedtodisk and PG_reclaim Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 19/25] radix-tree: implement radix_tree_maybe_preload_order() Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 20/25] filemap: prepare find and delete operations for huge pages Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 21/25] truncate: handle file thp Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 22/25] shmem: prepare huge= mount option and sysfs knob Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 23/25] shmem: get_unmapped_area align huge page Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 24/25] shmem: add huge pages support Kirill A. Shutemov
2016-03-11 22:59 ` [PATCHv4 25/25] shmem, thp: respect MADV_{NO,}HUGEPAGE for file mappings Kirill A. Shutemov
2016-03-15 15:52 ` [PATCHv5 26/25] thp: update Documentation/vm/transhuge.txt Kirill A. Shutemov
2016-03-23 20:09 ` [PATCHv4 00/25] THP-enabled tmpfs/shmem Hugh Dickins
2016-03-24 9:17 ` Kirill A. Shutemov
2016-03-24 19:08 ` Hugh Dickins
2016-03-25 15:04 ` Kirill A. Shutemov
2016-03-26 0:00 ` Hugh Dickins
2016-03-28 18:00 ` Kirill A. Shutemov
2016-03-28 18:42 ` Hugh Dickins
2016-03-28 12:29 ` Kirill A. Shutemov
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