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From: Michael Ellerman <mpe@ellerman.id.au>
To: Peter Xu <peterx@redhat.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Peter Xu <peterx@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Will Deacon <will@kernel.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 16/26] mm/powerpc: Use general page fault accounting
Date: Fri, 03 Jul 2020 21:08:15 +1000	[thread overview]
Message-ID: <875zb47t5s.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <20200626223622.199765-1-peterx@redhat.com>

Peter Xu <peterx@redhat.com> writes:
> Use the general page fault accounting by passing regs into handle_mm_fault().
>
> CC: Michael Ellerman <mpe@ellerman.id.au>
> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> CC: Paul Mackerras <paulus@samba.org>
> CC: linuxppc-dev@lists.ozlabs.org
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>  arch/powerpc/mm/fault.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
> index 992b10c3761c..e325d13efaf5 100644
> --- a/arch/powerpc/mm/fault.c
> +++ b/arch/powerpc/mm/fault.c
> @@ -563,7 +563,7 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
>  	 * make sure we exit gracefully rather than endlessly redo
>  	 * the fault.
>  	 */
> -	fault = handle_mm_fault(vma, address, flags, NULL);
> +	fault = handle_mm_fault(vma, address, flags, regs);
>  
>  #ifdef CONFIG_PPC_MEM_KEYS
>  	/*
> @@ -604,14 +604,9 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
>  	/*
>  	 * Major/minor page fault accounting.
>  	 */
> -	if (major) {
> -		current->maj_flt++;
> -		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address);
> +	if (major)
>  		cmo_account_page_fault();
> -	} else {
> -		current->min_flt++;
> -		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address);
> -	}
> +
>  	return 0;
>  }
>  NOKPROBE_SYMBOL(__do_page_fault);


You do change the logic a bit if regs is NULL (in mm_account_fault()),
but regs can never be NULL in this path, so it looks OK to me.

Acked-by: Michael Ellerman <mpe@ellerman.id.au>

cheers

WARNING: multiple messages have this Message-ID (diff)
From: Michael Ellerman <mpe@ellerman.id.au>
To: Peter Xu <peterx@redhat.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Andrea Arcangeli <aarcange@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org, Peter Xu <peterx@redhat.com>,
	Paul Mackerras <paulus@samba.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Will Deacon <will@kernel.org>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>
Subject: Re: [PATCH 16/26] mm/powerpc: Use general page fault accounting
Date: Fri, 03 Jul 2020 21:08:15 +1000	[thread overview]
Message-ID: <875zb47t5s.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <20200626223622.199765-1-peterx@redhat.com>

Peter Xu <peterx@redhat.com> writes:
> Use the general page fault accounting by passing regs into handle_mm_fault().
>
> CC: Michael Ellerman <mpe@ellerman.id.au>
> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> CC: Paul Mackerras <paulus@samba.org>
> CC: linuxppc-dev@lists.ozlabs.org
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>  arch/powerpc/mm/fault.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
> index 992b10c3761c..e325d13efaf5 100644
> --- a/arch/powerpc/mm/fault.c
> +++ b/arch/powerpc/mm/fault.c
> @@ -563,7 +563,7 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
>  	 * make sure we exit gracefully rather than endlessly redo
>  	 * the fault.
>  	 */
> -	fault = handle_mm_fault(vma, address, flags, NULL);
> +	fault = handle_mm_fault(vma, address, flags, regs);
>  
>  #ifdef CONFIG_PPC_MEM_KEYS
>  	/*
> @@ -604,14 +604,9 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
>  	/*
>  	 * Major/minor page fault accounting.
>  	 */
> -	if (major) {
> -		current->maj_flt++;
> -		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address);
> +	if (major)
>  		cmo_account_page_fault();
> -	} else {
> -		current->min_flt++;
> -		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address);
> -	}
> +
>  	return 0;
>  }
>  NOKPROBE_SYMBOL(__do_page_fault);


You do change the logic a bit if regs is NULL (in mm_account_fault()),
but regs can never be NULL in this path, so it looks OK to me.

Acked-by: Michael Ellerman <mpe@ellerman.id.au>

cheers

  reply	other threads:[~2020-07-03 11:06 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-26 22:31 [PATCH 00/26] mm: Page fault accounting cleanups Peter Xu
2020-06-26 22:31 ` [PATCH 01/26] mm: Do page fault accounting in handle_mm_fault Peter Xu
2020-06-29  1:52   ` John Hubbard
2020-06-29 14:56     ` Peter Xu
2020-06-26 22:31 ` [PATCH 02/26] mm/alpha: Use general page fault accounting Peter Xu
2020-06-26 22:31 ` [PATCH 03/26] mm/arc: " Peter Xu
2020-06-26 22:31   ` Peter Xu
2020-06-26 22:31 ` [PATCH 04/26] mm/arm: " Peter Xu
2020-06-26 22:31   ` Peter Xu
2020-06-26 22:31 ` [PATCH 05/26] mm/arm64: " Peter Xu
2020-06-26 22:31   ` Peter Xu
2020-06-26 22:31 ` [PATCH 06/26] mm/csky: " Peter Xu
2020-06-26 22:31 ` [PATCH 07/26] mm/hexagon: " Peter Xu
2020-06-26 22:31 ` [PATCH 08/26] mm/ia64: " Peter Xu
2020-06-26 22:31 ` [PATCH 09/26] mm/m68k: " Peter Xu
2020-06-26 22:31 ` [PATCH 10/26] mm/microblaze: " Peter Xu
2020-06-26 22:31 ` [PATCH 11/26] mm/mips: " Peter Xu
2020-06-26 22:31 ` [PATCH 12/26] mm/nds32: " Peter Xu
2020-06-27  2:59   ` Greentime Hu
2020-06-27  2:59     ` Greentime Hu
2020-06-26 22:36 ` [PATCH 13/26] mm/nios2: " Peter Xu
2020-06-26 22:36 ` [PATCH 14/26] mm/openrisc: " Peter Xu
2020-06-26 22:36   ` [OpenRISC] " Peter Xu
2020-06-26 22:36 ` [PATCH 15/26] mm/parisc: " Peter Xu
2020-06-26 22:36 ` [PATCH 16/26] mm/powerpc: " Peter Xu
2020-06-26 22:36   ` Peter Xu
2020-07-03 11:08   ` Michael Ellerman [this message]
2020-07-03 11:08     ` Michael Ellerman
2020-06-26 22:36 ` [PATCH 17/26] mm/riscv: " Peter Xu
2020-06-26 22:36   ` Peter Xu
2020-07-01 11:46   ` Pekka Enberg
2020-07-01 11:46     ` Pekka Enberg
2020-07-01 11:46     ` Pekka Enberg
2020-07-02 15:51     ` Peter Xu
2020-07-02 15:51       ` Peter Xu
2020-07-11 19:43   ` Palmer Dabbelt
2020-07-11 19:43     ` Palmer Dabbelt
2020-07-14 15:12     ` Pekka Enberg
2020-07-14 15:12       ` Pekka Enberg
2020-07-14 15:12       ` Pekka Enberg
2020-06-26 22:36 ` [PATCH 18/26] mm/s390: " Peter Xu
2020-06-26 22:36 ` [PATCH 19/26] mm/sh: " Peter Xu
2020-06-26 22:36   ` Peter Xu
2020-06-26 22:36 ` [PATCH 20/26] mm/sparc32: " Peter Xu
2020-06-26 22:36   ` Peter Xu
2020-06-26 22:36 ` [PATCH 21/26] mm/sparc64: " Peter Xu
2020-06-26 22:36   ` Peter Xu
2020-06-26 22:36 ` [PATCH 22/26] mm/unicore32: " Peter Xu
2020-06-26 22:36 ` [PATCH 23/26] mm/x86: " Peter Xu
2020-06-26 22:36 ` [PATCH 24/26] mm/xtensa: " Peter Xu
2020-06-26 22:36 ` [PATCH 25/26] mm: Clean up the last pieces of page fault accountings Peter Xu
2020-06-26 22:36 ` [PATCH 26/26] mm/gup: Remove task_struct pointer for all gup code Peter Xu
  -- strict thread matches above, loose matches on Subject: below --
2020-06-19 16:05 [PATCH 00/26] mm: Page fault accounting cleanups Peter Xu
2020-06-19 16:13 ` [PATCH 16/26] mm/powerpc: Use general page fault accounting Peter Xu
2020-06-19 16:13   ` Peter Xu

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