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Subject: Re: [PATCH v10 03/33] mm/vmstat: Add functions to account folio
 statistics
To:     "Matthew Wilcox (Oracle)" <willy@infradead.org>,
        akpm@linux-foundation.org
Cc:     linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
        Jeff Layton <jlayton@kernel.org>
References: <20210511214735.1836149-1-willy@infradead.org>
 <20210511214735.1836149-4-willy@infradead.org>
From:   Vlastimil Babka <vbabka@suse.cz>
Message-ID: <e0bb6713-67b6-e9cb-70c3-66b27aef72ed@suse.cz>
Date:   Fri, 14 May 2021 12:36:50 +0200
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On 5/11/21 11:47 PM, Matthew Wilcox (Oracle) wrote:
> Allow page counters to be more readily modified by callers which have
> a folio.  Name these wrappers with 'stat' instead of 'state' as requested
> by Linus here:
> https://lore.kernel.org/linux-mm/CAHk-=wj847SudR-kt+46fT3+xFFgiwpgThvm7DJWGdi4cVrbnQ@mail.gmail.com/
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Acked-by: Jeff Layton <jlayton@kernel.org>

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

> ---
>  include/linux/vmstat.h | 107 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 107 insertions(+)
> 
> diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
> index 3299cd69e4ca..d287d7c31b8f 100644
> --- a/include/linux/vmstat.h
> +++ b/include/linux/vmstat.h
> @@ -402,6 +402,78 @@ static inline void drain_zonestat(struct zone *zone,
>  			struct per_cpu_pageset *pset) { }
>  #endif		/* CONFIG_SMP */
>  
> +static inline void __zone_stat_mod_folio(struct folio *folio,
> +		enum zone_stat_item item, long nr)
> +{
> +	__mod_zone_page_state(folio_zone(folio), item, nr);
> +}
> +
> +static inline void __zone_stat_add_folio(struct folio *folio,
> +		enum zone_stat_item item)
> +{
> +	__mod_zone_page_state(folio_zone(folio), item, folio_nr_pages(folio));
> +}
> +
> +static inline void __zone_stat_sub_folio(struct folio *folio,
> +		enum zone_stat_item item)
> +{
> +	__mod_zone_page_state(folio_zone(folio), item, -folio_nr_pages(folio));
> +}
> +
> +static inline void zone_stat_mod_folio(struct folio *folio,
> +		enum zone_stat_item item, long nr)
> +{
> +	mod_zone_page_state(folio_zone(folio), item, nr);
> +}
> +
> +static inline void zone_stat_add_folio(struct folio *folio,
> +		enum zone_stat_item item)
> +{
> +	mod_zone_page_state(folio_zone(folio), item, folio_nr_pages(folio));
> +}
> +
> +static inline void zone_stat_sub_folio(struct folio *folio,
> +		enum zone_stat_item item)
> +{
> +	mod_zone_page_state(folio_zone(folio), item, -folio_nr_pages(folio));
> +}
> +
> +static inline void __node_stat_mod_folio(struct folio *folio,
> +		enum node_stat_item item, long nr)
> +{
> +	__mod_node_page_state(folio_pgdat(folio), item, nr);
> +}
> +
> +static inline void __node_stat_add_folio(struct folio *folio,
> +		enum node_stat_item item)
> +{
> +	__mod_node_page_state(folio_pgdat(folio), item, folio_nr_pages(folio));
> +}
> +
> +static inline void __node_stat_sub_folio(struct folio *folio,
> +		enum node_stat_item item)
> +{
> +	__mod_node_page_state(folio_pgdat(folio), item, -folio_nr_pages(folio));
> +}
> +
> +static inline void node_stat_mod_folio(struct folio *folio,
> +		enum node_stat_item item, long nr)
> +{
> +	mod_node_page_state(folio_pgdat(folio), item, nr);
> +}
> +
> +static inline void node_stat_add_folio(struct folio *folio,
> +		enum node_stat_item item)
> +{
> +	mod_node_page_state(folio_pgdat(folio), item, folio_nr_pages(folio));
> +}
> +
> +static inline void node_stat_sub_folio(struct folio *folio,
> +		enum node_stat_item item)
> +{
> +	mod_node_page_state(folio_pgdat(folio), item, -folio_nr_pages(folio));
> +}
> +
>  static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
>  					     int migratetype)
>  {
> @@ -530,6 +602,24 @@ static inline void __dec_lruvec_page_state(struct page *page,
>  	__mod_lruvec_page_state(page, idx, -1);
>  }
>  
> +static inline void __lruvec_stat_mod_folio(struct folio *folio,
> +					   enum node_stat_item idx, int val)
> +{
> +	__mod_lruvec_page_state(&folio->page, idx, val);
> +}
> +
> +static inline void __lruvec_stat_add_folio(struct folio *folio,
> +					   enum node_stat_item idx)
> +{
> +	__lruvec_stat_mod_folio(folio, idx, folio_nr_pages(folio));
> +}
> +
> +static inline void __lruvec_stat_sub_folio(struct folio *folio,
> +					   enum node_stat_item idx)
> +{
> +	__lruvec_stat_mod_folio(folio, idx, -folio_nr_pages(folio));
> +}
> +
>  static inline void inc_lruvec_page_state(struct page *page,
>  					 enum node_stat_item idx)
>  {
> @@ -542,4 +632,21 @@ static inline void dec_lruvec_page_state(struct page *page,
>  	mod_lruvec_page_state(page, idx, -1);
>  }
>  
> +static inline void lruvec_stat_mod_folio(struct folio *folio,
> +					 enum node_stat_item idx, int val)
> +{
> +	mod_lruvec_page_state(&folio->page, idx, val);
> +}
> +
> +static inline void lruvec_stat_add_folio(struct folio *folio,
> +					 enum node_stat_item idx)
> +{
> +	lruvec_stat_mod_folio(folio, idx, folio_nr_pages(folio));
> +}
> +
> +static inline void lruvec_stat_sub_folio(struct folio *folio,
> +					 enum node_stat_item idx)
> +{
> +	lruvec_stat_mod_folio(folio, idx, -folio_nr_pages(folio));
> +}
>  #endif /* _LINUX_VMSTAT_H */
>