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>
next prev parent 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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