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From: Greentime Hu <green.hu@gmail.com>
To: Peter Xu <peterx@redhat.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Nick Hu <nickhu@andestech.com>,
	Vincent Chen <deanbo422@gmail.com>
Subject: Re: [PATCH 13/25] mm/nds32: Use mm_fault_accounting()
Date: Wed, 17 Jun 2020 09:05:18 +0800	[thread overview]
Message-ID: <CAEbi=3e7t+=q5x3Wogr+EuejFxxmyuQTHE7jpDW++2n6MB2OWQ@mail.gmail.com> (raw)
In-Reply-To: <20200615221607.7764-14-peterx@redhat.com>

Peter Xu <peterx@redhat.com> 於 2020年6月16日 週二 上午6:16寫道:
>
> Use the new mm_fault_accounting() helper for page fault accounting.
>
> Avoid doing page fault accounting multiple times if the page fault is retried.
> Since at it, move the accounting after releasing mmap_sem.
>
> CC: Nick Hu <nickhu@andestech.com>
> CC: Greentime Hu <green.hu@gmail.com>
> CC: Vincent Chen <deanbo422@gmail.com>
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>  arch/nds32/mm/fault.c | 19 +++----------------
>  1 file changed, 3 insertions(+), 16 deletions(-)
>
> diff --git a/arch/nds32/mm/fault.c b/arch/nds32/mm/fault.c
> index f331e533edc2..11537c03ab1d 100644
> --- a/arch/nds32/mm/fault.c
> +++ b/arch/nds32/mm/fault.c
> @@ -78,7 +78,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
>         struct mm_struct *mm;
>         struct vm_area_struct *vma;
>         int si_code;
> -       vm_fault_t fault;
> +       vm_fault_t fault, major = 0;
>         unsigned int mask = VM_ACCESS_FLAGS;
>         unsigned int flags = FAULT_FLAG_DEFAULT;
>
> @@ -208,6 +208,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
>          */
>
>         fault = handle_mm_fault(vma, addr, flags);
> +       major |= fault & VM_FAULT_MAJOR;
>
>         /*
>          * If we need to retry but a fatal signal is pending, handle the
> @@ -229,22 +230,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
>                         goto bad_area;
>         }
>
> -       /*
> -        * Major/minor page fault accounting is only done on the initial
> -        * attempt. If we go through a retry, it is extremely likely that the
> -        * page will be found in page cache at that point.
> -        */
> -       perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr);
>         if (flags & FAULT_FLAG_ALLOW_RETRY) {
> -               if (fault & VM_FAULT_MAJOR) {
> -                       tsk->maj_flt++;
> -                       perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ,
> -                                     1, regs, addr);
> -               } else {
> -                       tsk->min_flt++;
> -                       perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN,
> -                                     1, regs, addr);
> -               }
>                 if (fault & VM_FAULT_RETRY) {
>                         flags |= FAULT_FLAG_TRIED;
>
> @@ -257,6 +243,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
>         }
>
>         up_read(&mm->mmap_sem);
> +       mm_fault_accounting(tsk, regs, addr, major);
>         return;
>
>         /*
> --
Hi Peter,

Thank you. :)
Acked-by: Greentime Hu <green.hu@gmail.com>

  reply	other threads:[~2020-06-17  1:06 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-15 22:15 [PATCH 00/25] mm: Page fault accounting cleanups Peter Xu
2020-06-15 22:15 ` [PATCH 01/25] mm/um: Fix extra accounting for page fault retries Peter Xu
2020-06-15 22:15 ` [PATCH 02/25] mm: Introduce mm_fault_accounting() Peter Xu
2020-06-15 22:32   ` Linus Torvalds
2020-06-15 23:19     ` Peter Xu
2020-06-16 19:00       ` Andrew Morton
2020-06-17 16:26         ` Peter Xu
2020-06-15 22:15 ` [PATCH 03/25] mm/alpha: Use mm_fault_accounting() Peter Xu
2020-06-15 22:15 ` [PATCH 04/25] mm/arc: " Peter Xu
2020-06-15 22:15 ` [PATCH 05/25] mm/arm: " Peter Xu
2020-06-15 22:15 ` [PATCH 06/25] mm/arm64: " Peter Xu
2020-06-16  7:43   ` Will Deacon
2020-06-16 15:59     ` Peter Xu
2020-06-15 22:15 ` [PATCH 07/25] mm/csky: " Peter Xu
2020-06-17  7:04   ` Guo Ren
2020-06-17 15:49     ` Peter Xu
2020-06-17 17:53       ` Linus Torvalds
2020-06-17 19:58         ` Peter Xu
2020-06-17 20:15           ` Linus Torvalds
2020-06-18 14:38             ` Peter Xu
2020-06-18 17:15               ` Linus Torvalds
2020-06-18 21:24                 ` Peter Xu
2020-06-18 22:28                   ` Peter Xu
2020-06-18 22:59                     ` Linus Torvalds
2020-06-15 22:15 ` [PATCH 08/25] mm/hexagon: " Peter Xu
2020-06-15 22:15 ` [PATCH 09/25] mm/ia64: " Peter Xu
2020-06-15 22:15 ` [PATCH 10/25] mm/m68k: " Peter Xu
2020-06-15 22:15 ` [PATCH 11/25] mm/microblaze: " Peter Xu
2020-06-15 22:15 ` [PATCH 12/25] mm/mips: " Peter Xu
2020-06-15 22:15 ` [PATCH 13/25] mm/nds32: " Peter Xu
2020-06-17  1:05   ` Greentime Hu [this message]
2020-06-15 22:15 ` [PATCH 14/25] mm/nios2: " Peter Xu
2020-06-15 22:15 ` [PATCH 15/25] mm/openrisc: " Peter Xu
2020-06-16 18:11   ` Stafford Horne
2020-06-15 22:15 ` [PATCH 16/25] mm/parisc: " Peter Xu
2020-06-15 22:15 ` [PATCH 17/25] mm/powerpc: " Peter Xu
2020-06-15 22:16 ` [PATCH 18/25] mm/riscv: " Peter Xu
2020-06-18 23:49   ` Palmer Dabbelt
2020-06-19  0:12     ` Peter Xu
2020-06-15 22:23 ` [PATCH 19/25] mm/s390: " Peter Xu
2020-06-16 15:59   ` Alexander Gordeev
2020-06-16 16:35     ` Peter Xu
2020-06-17  6:19       ` Christian Borntraeger
2020-06-17 16:06         ` Peter Xu
2020-06-17 16:14           ` Christian Borntraeger
2020-06-17 16:44             ` Peter Xu
2020-06-15 22:23 ` [PATCH 20/25] mm/sh: " Peter Xu
2020-07-20 21:25   ` Rich Felker
2020-07-20 22:05     ` Peter Xu
2020-06-15 22:23 ` [PATCH 21/25] mm/sparc32: " Peter Xu
2020-06-15 22:23 ` [PATCH 22/25] mm/sparc64: " Peter Xu
2020-06-15 22:23 ` [PATCH 23/25] mm/unicore32: " Peter Xu
2020-06-15 22:23 ` [PATCH 24/25] mm/x86: " Peter Xu
2020-06-15 22:23 ` [PATCH 25/25] mm/xtensa: " Peter Xu
2020-06-15 23:13   ` Max Filippov
2020-06-16 18:55 ` [PATCH 00/25] mm: Page fault accounting cleanups Linus Torvalds
2020-06-16 21:03   ` Peter Xu
2020-06-17  0:55   ` Michael Ellerman
2020-06-17  8:04     ` Will Deacon
2020-06-17 16:10       ` Peter Xu

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