linux-kernel - Re: [PATCH 17/26] mm/riscv: Use general page fault accounting

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Message-ID: <CAOJsxLEYHzjgMtXgbkoWYvU+Lf_08GPkMAFqibnEwARNzxJZxQ@mail.gmail.com>
Date:   Wed, 1 Jul 2020 14:46:24 +0300
From:   Pekka Enberg <penberg@...il.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 17/26] mm/riscv: Use general page fault accounting

Hi Peter,

On Sat, Jun 27, 2020 at 1:36 AM Peter Xu <peterx@...hat.com> wrote:
> Use the general page fault accounting by passing regs into handle_mm_fault().
> It naturally solve the issue of multiple page fault accounting when page fault
> retry happened.

I sent a patch to fix up riscv page fault accounting some days ago:

http://lists.infradead.org/pipermail/linux-riscv/2020-June/000775.html

However, your fix is obviously even better. For the generic and riscv parts:

Reviewed-by: Pekka Enberg <penberg@...nel.org>

- Pekka