linux-kernel - Re: [PATCH 10/11] mm/page_alloc: Update PGFREE outside the zone lock in __free_pages

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Date:   Thu, 15 Apr 2021 15:04:38 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Mel Gorman <mgorman@...hsingularity.net>,
        Linux-MM <linux-mm@...ck.org>,
        Linux-RT-Users <linux-rt-users@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Michal Hocko <mhocko@...nel.org>
Subject: Re: [PATCH 10/11] mm/page_alloc: Update PGFREE outside the zone lock
 in __free_pages_ok

On 4/14/21 3:39 PM, Mel Gorman wrote:
> VM events do not need explicit protection by disabling IRQs so
> update the counter with IRQs enabled in __free_pages_ok.
> 
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/page_alloc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index a0b210077178..8a94fe77bef7 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1569,10 +1569,11 @@ static void __free_pages_ok(struct page *page, unsigned int order,
>  	migratetype = get_pfnblock_migratetype(page, pfn);
>  
>  	spin_lock_irqsave(&zone->lock, flags);
> -	__count_vm_events(PGFREE, 1 << order);
>  	migratetype = check_migratetype_isolated(zone, page, pfn, migratetype);
>  	__free_one_page(page, pfn, zone, order, migratetype, fpi_flags);
>  	spin_unlock_irqrestore(&zone->lock, flags);
> +
> +	__count_vm_events(PGFREE, 1 << order);
>  }
>  
>  void __free_pages_core(struct page *page, unsigned int order)
>