linux-kernel - Re: [PATCH 06/26] mm/csky: Use general page fault accounting

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Date:   Sat, 20 Jun 2020 09:44:31 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Peter Xu <peterx@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org, Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-csky@...r.kernel.org
Subject: Re: [PATCH 06/26] mm/csky: Use general page fault accounting

On Sat, Jun 20, 2020 at 12:05 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.
>
> CC: Guo Ren <guoren@...nel.org>
> CC: linux-csky@...r.kernel.org
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  arch/csky/mm/fault.c | 12 +-----------
>  1 file changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
> index b14f97d3cb15..a3e0aa3ebb79 100644
> --- a/arch/csky/mm/fault.c
> +++ b/arch/csky/mm/fault.c
> @@ -151,7 +151,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
>          * the fault.
>          */
>         fault = handle_mm_fault(vma, address, write ? FAULT_FLAG_WRITE : 0,
> -                               NULL);
> +                               regs);
what's your kernel version ? （4th arg exsist ?）
        /*
         * If for any reason at all we couldn't handle the fault,
         * make sure we exit gracefully rather than endlessly redo
         * the fault.
         */
        fault = handle_mm_fault(vma, address, write ? FAULT_FLAG_WRITE : 0);
        if (unlikely(fault & VM_FAULT_ERROR)) {



-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/