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Date:   Mon, 8 Feb 2021 16:09:26 -0800
From:   Mike Kravetz <>
To:     Peter Xu <>,,
Cc:     Gal Pressman <>,
        Andrea Arcangeli <>,
        Christoph Hellwig <>,
        Miaohe Lin <>,
        Kirill Shutemov <>,
        Jann Horn <>,
        Matthew Wilcox <>, Jan Kara <>,
        Jason Gunthorpe <>,
        Linus Torvalds <>,
        Mike Rapoport <>,
        David Gibson <>,
        Kirill Tkhai <>,
        Wei Zhang <>,
        Andrew Morton <>
Subject: Re: [PATCH v3 5/5] hugetlb: Do early cow when page pinned on src mm

On 2/5/21 8:54 AM, Peter Xu wrote:
> This is the last missing piece of the COW-during-fork effort when there're
> pinned pages found.  One can reference 70e806e4e645 ("mm: Do early cow for
> pinned pages during fork() for ptes", 2020-09-27) for more information, since
> we do similar things here rather than pte this time, but just for hugetlb.

Thanks for all the changes, the patch looks much better.

I did not look at 70e806e4e645 in detail until now.  That commit had the
'write protect trick' which was removed in subsequent commits.  It took me
a bit of git history tracking to figure out the state of that code today and
the reasons for the subsequent changes.  I guess that was a good way to
educate me. :) 

> Signed-off-by: Peter Xu <>
> ---
>  mm/hugetlb.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 62 insertions(+), 4 deletions(-)

Reviewed-by: Mike Kravetz <>
Mike Kravetz

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