From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrea Arcangeli <aarcange@redhat.com>, Zi Yan <ziy@nvidia.com>,
Yang Shi <yang.shi@linux.alibaba.com>,
Ralph Campbell <rcampbell@nvidia.com>,
John Hubbard <jhubbard@nvidia.com>,
William Kucharski <william.kucharski@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv3, RESEND 6/8] khugepaged: Allow to collapse PTE-mapped compound pages
Date: Thu, 16 Apr 2020 00:52:05 +0300 [thread overview]
Message-ID: <20200415215205.eaihc5snfe4ffhju@box> (raw)
In-Reply-To: <20200415144426.a146ef173140f5bc396a6dcd@linux-foundation.org>
On Wed, Apr 15, 2020 at 02:44:26PM -0700, Andrew Morton wrote:
> On Mon, 13 Apr 2020 15:52:18 +0300 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:
>
> > We can collapse PTE-mapped compound pages. We only need to avoid
> > handling them more than once: lock/unlock page only once if it's present
> > in the PMD range multiple times as it handled on compound level. The
> > same goes for LRU isolation and putback.
> >
> > ...
> >
> > --- a/mm/khugepaged.c
> > +++ b/mm/khugepaged.c
> > @@ -515,17 +515,30 @@ void __khugepaged_exit(struct mm_struct *mm)
> >
> > static void release_pte_page(struct page *page)
> > {
> > - dec_node_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page));
>
> I have
>
> dec_node_page_state(page, NR_ISOLATED_ANON + page_is_file_lru(page));
>
> here. Is there some prerequisite which I wasn't able to find?
The patchset is on top of v5.6. It has been changed since. See
9de4f22a60f7 ("mm: code cleanup for MADV_FREE").
Look like a trivial fixup is required.
--
Kirill A. Shutemov
next prev parent reply other threads:[~2020-04-15 21:52 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-13 12:52 [PATCHv3, RESEND 0/8] thp/khugepaged improvements and CoW semantics Kirill A. Shutemov
2020-04-13 12:52 ` [PATCHv3, RESEND 1/8] khugepaged: Add self test Kirill A. Shutemov
2020-04-15 15:39 ` Zi Yan
2020-04-15 20:11 ` Yang Shi
2020-04-13 12:52 ` [PATCHv3, RESEND 2/8] khugepaged: Do not stop collapse if less than half PTEs are referenced Kirill A. Shutemov
2020-04-15 20:31 ` Yang Shi
2020-04-13 12:52 ` [PATCHv3, RESEND 3/8] khugepaged: Drain all LRU caches before scanning pages Kirill A. Shutemov
2020-04-15 20:31 ` Yang Shi
2020-04-13 12:52 ` [PATCHv3, RESEND 4/8] khugepaged: Drain LRU add pagevec after swapin Kirill A. Shutemov
2020-04-15 20:32 ` Yang Shi
2020-04-13 12:52 ` [PATCHv3, RESEND 5/8] khugepaged: Allow to collapse a page shared across fork Kirill A. Shutemov
2020-04-13 20:48 ` John Hubbard
2020-04-14 21:35 ` Kirill A. Shutemov
2020-04-15 2:42 ` John Hubbard
2020-04-15 2:43 ` John Hubbard
2020-04-15 20:39 ` Yang Shi
2020-04-13 12:52 ` [PATCHv3, RESEND 6/8] khugepaged: Allow to collapse PTE-mapped compound pages Kirill A. Shutemov
2020-04-15 20:46 ` Yang Shi
2020-04-15 21:44 ` Andrew Morton
2020-04-15 21:52 ` Kirill A. Shutemov [this message]
2020-04-15 22:52 ` Andrew Morton
2020-04-15 22:59 ` Kirill A. Shutemov
2020-04-13 12:52 ` [PATCHv3, RESEND 7/8] thp: Change CoW semantics for anon-THP Kirill A. Shutemov
2020-04-15 21:19 ` Yang Shi
2020-04-13 12:52 ` [PATCHv3, RESEND 8/8] khugepaged: Introduce 'max_ptes_shared' tunable Kirill A. Shutemov
2020-04-15 21:25 ` Yang Shi
2020-04-16 15:52 ` Kirill A. Shutemov
2020-04-16 18:25 ` Yang Shi
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