linux-kernel - Re: [PATCHv4 4/8] khugepaged: Drain LRU add pagevec after swapin

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Date:   Thu, 16 Apr 2020 21:41:45 -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: [PATCHv4 4/8] khugepaged: Drain LRU add pagevec after swapin

On Thu, 16 Apr 2020 19:00:22 +0300 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote:

> __collapse_huge_page_isolate() may fail due to extra pin in the LRU add
> pagevec. It's pretty common for swapin case: we swap in pages just to
> fail due to the extra pin.
> 
> Drain LRU add pagevec on successful swapin.

I don't see how this patch can do anything to prevent
__collapse_huge_page_isolate() from failing, which is what the
changelog implies.

Can we have a more detailed changelog, please?