linux-kernel - Re: [PATCH 02/16] mm/page_alloc: make zone_pcp

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Date:   Fri, 9 Sep 2022 13:26:27 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Miaohe Lin <linmiaohe@...wei.com>, akpm@...ux-foundation.org
Cc:     osalvador@...e.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/16] mm/page_alloc: make zone_pcp_update() static

On 09.09.22 11:24, Miaohe Lin wrote:
> Since commit b92ca18e8ca5 ("mm/page_alloc: disassociate the pcp->high
> from pcp->batch"), zone_pcp_update() is only used in mm/page_alloc.c.
> Move zone_pcp_update() up to avoid forward declaration and then make
> it static. No functional change intended.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>   mm/internal.h   |  1 -
>   mm/page_alloc.c | 22 +++++++++++-----------
>   2 files changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/mm/internal.h b/mm/internal.h
> index 4e5f3d0d5538..2424fcde6538 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -367,7 +367,6 @@ extern int user_min_free_kbytes;
>   extern void free_unref_page(struct page *page, unsigned int order);
>   extern void free_unref_page_list(struct list_head *list);
>   
> -extern void zone_pcp_update(struct zone *zone, int cpu_online);
>   extern void zone_pcp_reset(struct zone *zone);
>   extern void zone_pcp_disable(struct zone *zone);
>   extern void zone_pcp_enable(struct zone *zone);
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 4b97a03fa2dd..2deac2fe3372 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -7238,6 +7238,17 @@ void __meminit setup_zone_pageset(struct zone *zone)
>   	zone_set_pageset_high_and_batch(zone, 0);
>   }
>   
> +/*
> + * The zone indicated has a new number of managed_pages; batch sizes and percpu
> + * page high values need to be recalculated.
> + */
> +static void zone_pcp_update(struct zone *zone, int cpu_online)
> +{
> +	mutex_lock(&pcp_batch_high_lock);
> +	zone_set_pageset_high_and_batch(zone, cpu_online);
> +	mutex_unlock(&pcp_batch_high_lock);
> +}
> +
>   /*
>    * Allocate per cpu pagesets and initialize them.
>    * Before this call only boot pagesets were available.
> @@ -9469,17 +9480,6 @@ void free_contig_range(unsigned long pfn, unsigned long nr_pages)
>   }
>   EXPORT_SYMBOL(free_contig_range);
>   
> -/*
> - * The zone indicated has a new number of managed_pages; batch sizes and percpu
> - * page high values need to be recalculated.
> - */
> -void zone_pcp_update(struct zone *zone, int cpu_online)
> -{
> -	mutex_lock(&pcp_batch_high_lock);
> -	zone_set_pageset_high_and_batch(zone, cpu_online);
> -	mutex_unlock(&pcp_batch_high_lock);
> -}
> -
>   /*
>    * Effectively disable pcplists for the zone by setting the high limit to 0
>    * and draining all cpus. A concurrent page freeing on another CPU that's about

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb