linux-kernel - Re: [RFC PATCH 01/14] userfaultfd: set dirty and young on writeprotect

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Message-ID: <YthUYF3invrjlzUc@xz-m1.local>
Date:   Wed, 20 Jul 2022 15:15:44 -0400
From:   Peter Xu <peterx@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Nadav Amit <nadav.amit@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Nadav Amit <namit@...are.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, Yu Zhao <yuzhao@...gle.com>,
        Nick Piggin <npiggin@...il.com>
Subject: Re: [RFC PATCH 01/14] userfaultfd: set dirty and young on
 writeprotect

On Wed, Jul 20, 2022 at 05:10:37PM +0200, David Hildenbrand wrote:
> For pagecache pages it may as well be *plain wrong* to bypass the write
> fault handler and simply mark pages dirty+map them writable.

Could you elaborate?

-- 
Peter Xu