linux-kernel - Re: [PATCH 01/13] mm: Update ptep_get

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Message-Id: <DDF26E69-1FFF-40D6-802B-2A5DC5C3D4CE@gmail.com>
Date:   Sun, 30 Oct 2022 21:55:11 -0700
From:   Nadav Amit <nadav.amit@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Jann Horn <jannh@...gle.com>,
        John Hubbard <jhubbard@...dia.com>, X86 ML <x86@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        jroedel@...e.de, ubizjak@...il.com,
        Alistair Popple <apopple@...dia.com>
Subject: Re: [PATCH 01/13] mm: Update ptep_get_lockless()s comment

On Oct 30, 2022, at 9:09 PM, Nadav Amit <nadav.amit@...il.com> wrote:

> I understand from the code that you decided to drop the deferring of
> set_page_dirty(), which could - at least for the munmap case (where
> mmap_lock is taken for write) - prevent the need for “force_flush” and
> potentially save TLB flushes.
> 
> I was just wondering whether the reason for that is that you wanted
> to have small backportable and conservative patches, or whether you
> changed your mind about it.

Please ignore this silly question. I understand - the buffers might still be
dropped.