linux-kernel - RE: [PATCH v4 07/26] mm/hexagon: Use general page fault accounting

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Date:   Tue, 30 Jun 2020 17:57:29 -0500
From:   "Brian Cain" <bcain@...eaurora.org>
To:     "'Peter Xu'" <peterx@...hat.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Cc:     "'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-hexagon@...r.kernel.org>
Subject: RE: [PATCH v4 07/26] mm/hexagon: Use general page fault accounting


> -----Original Message-----
> From: linux-hexagon-owner@...r.kernel.org <linux-hexagon-
...

Acked-by: Brian Cain <bcain@...eaurora.org>

> CC: Brian Cain <bcain@...eaurora.org>
> CC: linux-hexagon@...r.kernel.org
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  arch/hexagon/mm/vm_fault.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/hexagon/mm/vm_fault.c b/arch/hexagon/mm/vm_fault.c
> index f12f330e7946..ef32c5a84ff3 100644
> --- a/arch/hexagon/mm/vm_fault.c
> +++ b/arch/hexagon/mm/vm_fault.c
> @@ -18,6 +18,7 @@
>  #include <linux/signal.h>
>  #include <linux/extable.h>
>  #include <linux/hardirq.h>
> +#include <linux/perf_event.h>
> 
>  /*
>   * Decode of hardware exception sends us to one of several @@ -53,6 +54,8
> @@ void do_page_fault(unsigned long address, long cause, struct pt_regs
> *regs)
> 
>  	if (user_mode(regs))
>  		flags |= FAULT_FLAG_USER;
> +
> +	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
>  retry:
>  	mmap_read_lock(mm);
>  	vma = find_vma(mm, address);
> @@ -88,7 +91,7 @@ void do_page_fault(unsigned long address, long cause,
> struct pt_regs *regs)
>  		break;
>  	}
> 
> -	fault = handle_mm_fault(vma, address, flags, NULL);
> +	fault = handle_mm_fault(vma, address, flags, regs);
> 
>  	if (fault_signal_pending(fault, regs))
>  		return;
> @@ -96,10 +99,6 @@ void do_page_fault(unsigned long address, long cause,
> struct pt_regs *regs)
>  	/* The most common case -- we are done. */
>  	if (likely(!(fault & VM_FAULT_ERROR))) {
>  		if (flags & FAULT_FLAG_ALLOW_RETRY) {
> -			if (fault & VM_FAULT_MAJOR)
> -				current->maj_flt++;
> -			else
> -				current->min_flt++;
>  			if (fault & VM_FAULT_RETRY) {
>  				flags |= FAULT_FLAG_TRIED;
>  				goto retry;
> --
> 2.26.2