linux-kernel - Re: [PATCH v3 03/25] mm/vmstat: Add folio stat wrappers

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Date:   Mon, 1 Mar 2021 16:17:39 -0500
From:   Zi Yan <ziy@...dia.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
CC:     <linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 03/25] mm/vmstat: Add folio stat wrappers

On 28 Jan 2021, at 2:03, 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@...radead.org>
> ---
>  include/linux/vmstat.h | 60 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 60 insertions(+)
>
> diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
> index 773135fc6e19..3c3373c2c3c2 100644
> --- a/include/linux/vmstat.h
> +++ b/include/linux/vmstat.h
> @@ -396,6 +396,54 @@ static inline void drain_zonestat(struct zone *zone,
>  			struct per_cpu_pageset *pset) { }
>  #endif		/* CONFIG_SMP */
>
> +static inline
> +void __inc_zone_folio_stat(struct folio *folio, enum zone_stat_item item)
> +{
> +	__inc_zone_page_state(&folio->page, item);

Shouldn’t we change the stats with folio_nr_pages(folio) here? And all
changes below. Otherwise one folio is always counted as a single page.

> +}
> +
> +static inline
> +void __dec_zone_folio_stat(struct folio *folio, enum zone_stat_item item)
> +{
> +	__dec_zone_page_state(&folio->page, item);
> +}
> +
> +static inline
> +void inc_zone_folio_stat(struct folio *folio, enum zone_stat_item item)
> +{
> +	inc_zone_page_state(&folio->page, item);
> +}
> +
> +static inline
> +void dec_zone_folio_stat(struct folio *folio, enum zone_stat_item item)
> +{
> +	dec_zone_page_state(&folio->page, item);
> +}
> +
> +static inline
> +void __inc_node_folio_stat(struct folio *folio, enum node_stat_item item)
> +{
> +	__inc_node_page_state(&folio->page, item);
> +}
> +
> +static inline
> +void __dec_node_folio_stat(struct folio *folio, enum node_stat_item item)
> +{
> +	__dec_node_page_state(&folio->page, item);
> +}
> +
> +static inline
> +void inc_node_folio_stat(struct folio *folio, enum node_stat_item item)
> +{
> +	inc_node_page_state(&folio->page, item);
> +}
> +
> +static inline
> +void dec_node_folio_stat(struct folio *folio, enum node_stat_item item)
> +{
> +	dec_node_page_state(&folio->page, item);
> +}
> +
>  static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
>  					     int migratetype)
>  {
> @@ -530,6 +578,18 @@ static inline void __dec_lruvec_page_state(struct page *page,
>  	__mod_lruvec_page_state(page, idx, -1);
>  }
>
> +static inline void __inc_lruvec_folio_stat(struct folio *folio,
> +					   enum node_stat_item idx)
> +{
> +	__mod_lruvec_page_state(&folio->page, idx, 1);
> +}
> +
> +static inline void __dec_lruvec_folio_stat(struct folio *folio,
> +					   enum node_stat_item idx)
> +{
> +	__mod_lruvec_page_state(&folio->page, idx, -1);
> +}
> +
>  static inline void inc_lruvec_state(struct lruvec *lruvec,
>  				    enum node_stat_item idx)
>  {
> -- 
> 2.29.2


—
Best Regards,
Yan Zi

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