From: "Huang\, Ying" <ying.huang@intel.com>
To: "Matthew Wilcox \(Oracle\)" <willy@infradead.org>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
"Kirill A . Shutemov" <kirill@shutemov.name>
Subject: Re: [PATCH 07/11] mm/huge_memory: Fix can_split_huge_page assumption of THP size
Date: Wed, 16 Sep 2020 09:44:55 +0800 [thread overview]
Message-ID: <87y2lasdew.fsf@yhuang-dev.intel.com> (raw)
In-Reply-To: <20200908195539.25896-8-willy@infradead.org> (Matthew Wilcox's message of "Tue, 8 Sep 2020 20:55:34 +0100")
"Matthew Wilcox (Oracle)" <willy@infradead.org> writes:
> Ask the page how many subpages it has instead of assuming it's PMD size.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> ---
> mm/huge_memory.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index e9503b10df8f..8bf8caf66923 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2546,9 +2546,9 @@ bool can_split_huge_page(struct page *page, int *pextra_pins)
>
> /* Additional pins from page cache */
> if (PageAnon(page))
> - extra_pins = PageSwapCache(page) ? HPAGE_PMD_NR : 0;
> + extra_pins = PageSwapCache(page) ? thp_nr_pages(page) : 0;
> else
> - extra_pins = HPAGE_PMD_NR;
> + extra_pins = thp_nr_pages(page);
> if (pextra_pins)
> *pextra_pins = extra_pins;
> return total_mapcount(page) == page_count(page) - extra_pins - 1;
Acked-by: "Huang, Ying" <ying.huang@intel.com>
Best Regards,
Huang, Ying
next prev parent reply other threads:[~2020-09-16 1:45 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-08 19:55 [PATCH 00/11] Remove assumptions of THP size Matthew Wilcox (Oracle)
2020-09-08 19:55 ` [PATCH 01/11] mm/filemap: Fix page cache removal for arbitrary sized THPs Matthew Wilcox (Oracle)
2020-09-09 14:27 ` Kirill A. Shutemov
2020-09-15 7:13 ` SeongJae Park
2020-09-08 19:55 ` [PATCH 02/11] mm/memory: Remove page fault assumption of compound page size Matthew Wilcox (Oracle)
2020-09-09 14:29 ` Kirill A. Shutemov
2020-09-09 14:50 ` Matthew Wilcox
2020-09-11 14:51 ` Kirill A. Shutemov
2020-09-08 19:55 ` [PATCH 03/11] mm/page_owner: Change split_page_owner to take a count Matthew Wilcox (Oracle)
2020-09-09 14:42 ` Kirill A. Shutemov
2020-09-15 7:17 ` SeongJae Park
2020-10-13 13:52 ` Matthew Wilcox
2020-09-08 19:55 ` [PATCH 04/11] mm/huge_memory: Fix total_mapcount assumption of page size Matthew Wilcox (Oracle)
2020-09-15 7:21 ` SeongJae Park
2020-09-08 19:55 ` [PATCH 05/11] mm/huge_memory: Fix split " Matthew Wilcox (Oracle)
2020-09-15 7:23 ` SeongJae Park
2020-09-08 19:55 ` [PATCH 06/11] mm/huge_memory: Fix page_trans_huge_mapcount assumption of THP size Matthew Wilcox (Oracle)
2020-09-09 14:45 ` Kirill A. Shutemov
2020-09-15 7:24 ` SeongJae Park
2020-09-08 19:55 ` [PATCH 07/11] mm/huge_memory: Fix can_split_huge_page " Matthew Wilcox (Oracle)
2020-09-09 14:46 ` Kirill A. Shutemov
2020-09-15 7:25 ` SeongJae Park
2020-09-16 1:44 ` Huang, Ying [this message]
2020-09-08 19:55 ` [PATCH 08/11] mm/rmap: Fix assumptions " Matthew Wilcox (Oracle)
2020-09-09 14:47 ` Kirill A. Shutemov
2020-09-15 7:27 ` SeongJae Park
2020-09-08 19:55 ` [PATCH 09/11] mm/truncate: Fix truncation for pages of arbitrary size Matthew Wilcox (Oracle)
2020-09-09 14:50 ` Kirill A. Shutemov
2020-09-15 7:36 ` SeongJae Park
2020-09-08 19:55 ` [PATCH 10/11] mm/page-writeback: Support tail pages in wait_for_stable_page Matthew Wilcox (Oracle)
2020-09-09 14:53 ` Kirill A. Shutemov
2020-09-15 7:37 ` SeongJae Park
2020-09-08 19:55 ` [PATCH 11/11] mm/vmscan: Allow arbitrary sized pages to be paged out Matthew Wilcox (Oracle)
2020-09-09 14:55 ` Kirill A. Shutemov
2020-09-15 7:40 ` SeongJae Park
2020-09-15 12:52 ` Matthew Wilcox
2020-09-16 1:40 ` Huang, Ying
2020-09-16 6:09 ` SeongJae Park
2020-09-30 12:13 ` Matthew Wilcox
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