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Date:   Sat, 22 Aug 2020 09:05:37 -0700
From:   Linus Torvalds <>
To:     Peter Xu <>
Cc:     Linux-MM <>,
        Linux Kernel Mailing List <>,
        "Maya B . Gokhale" <>,
        Yang Shi <>,
        Marty Mcfadden <>,
        Kirill Shutemov <>,
        Oleg Nesterov <>, Jann Horn <>,
        Jan Kara <>, Kirill Tkhai <>,
        Andrea Arcangeli <>,
        Christoph Hellwig <>,
        Andrew Morton <>
Subject: Re: [PATCH 0/4] mm: Simplfy cow handling

On Fri, Aug 21, 2020 at 4:50 PM Peter Xu <> wrote:
>   - Run a busy loop dirty program [1] that uses 6G of memory, restrict to 1G
>     RAM + 5G swap (cgroup).  A few hours later, all things still look good.
>     Make sure to observe (still massive) correct page reuses using the new
>     counter using the last patch, probably when swapping in.
>   - Run umapsort [2] to make sure uffd-wp will work again after applying this
>     series upon master 5.9-rc1 (5.9-rc1 is broken).

I obviously like the diffstat, am wondering if you saw any throughput
changes or similar for the busy-loop dirtying thing?


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