linux-kernel - Re: [RFC PATCH 02/14] userfaultfd: try to map write-unprotected pages

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Message-ID: <YtcYxJnmMOymlO95@xz-m1.local>
Date:   Tue, 19 Jul 2022 16:49:08 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Nadav Amit <nadav.amit@...il.com>
Cc:     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>,
        David Hildenbrand <david@...hat.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 02/14] userfaultfd: try to map write-unprotected pages

On Mon, Jul 18, 2022 at 05:02:00AM -0700, Nadav Amit wrote:
> From: Nadav Amit <namit@...are.com>
> 
> When using userfaultfd write-(un)protect ioctl, try to change the PTE to
> be writable. This would save a page-fault afterwards.
> 
> Cc: Andrea Arcangeli <aarcange@...hat.com>
> Cc: Andrew Cooper <andrew.cooper3@...rix.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Peter Xu <peterx@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Will Deacon <will@...nel.org>
> Cc: Yu Zhao <yuzhao@...gle.com>
> Cc: Nick Piggin <npiggin@...il.com>
> Signed-off-by: Nadav Amit <namit@...are.com>

Acked-by: Peter Xu <peterx@...hat.com>

-- 
Peter Xu