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Date: Wed, 15 Apr 2020 14:44:26 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Cc: Andrea Arcangeli <aarcange@...hat.com>, Zi Yan <ziy@...dia.com>, Yang Shi <yang.shi@...ux.alibaba.com>, Ralph Campbell <rcampbell@...dia.com>, John Hubbard <jhubbard@...dia.com>, William Kucharski <william.kucharski@...cle.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCHv3, RESEND 6/8] khugepaged: Allow to collapse PTE-mapped compound pages On Mon, 13 Apr 2020 15:52:18 +0300 "Kirill A. Shutemov" <kirill.shutemov@...ux.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?
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