linux-kernel - Re: [PATCH v4 06/26] mm/csky: Use general page fault accounting

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Date:   Wed, 1 Jul 2020 09:52:40 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-mm@...ck.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        John Hubbard <jhubbard@...dia.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Will Deacon <will@...nel.org>, linux-csky@...r.kernel.org
Subject: Re: [PATCH v4 06/26] mm/csky: Use general page fault accounting

Acked-by: Guo Ren <guoren@...nel.org>

On Wed, Jul 1, 2020 at 4:45 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 7137e2e8dc57..c3f580714ee4 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);
>         if (unlikely(fault & VM_FAULT_ERROR)) {
>                 if (fault & VM_FAULT_OOM)
>                         goto out_of_memory;
> @@ -161,16 +161,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
>                         goto bad_area;
>                 BUG();
>         }
> -       if (fault & VM_FAULT_MAJOR) {
> -               tsk->maj_flt++;
> -               perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs,
> -                             address);
> -       } else {
> -               tsk->min_flt++;
> -               perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs,
> -                             address);
> -       }
> -
>         mmap_read_unlock(mm);
>         return;
>
> --
> 2.26.2
>


-- 
Best Regards
 Guo Ren

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