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

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Date:   Sat, 20 Jun 2020 12:08:25 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Guo Ren <guoren@...nel.org>
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 09:44:31AM +0800, Guo Ren wrote:
> 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)) {

Hi, Guo,

Sorry to be unclear.  This patch is based on patch 1 in the same series:

https://lore.kernel.org/lkml/20200619160538.8641-2-peterx@redhat.com/

Thanks,

-- 
Peter Xu