linux-kernel - Re: [PATCH 04/11] mm/vmstat: Inline NUMA event counter updates

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Date:   Wed, 14 Apr 2021 18:20:38 +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 04/11] mm/vmstat: Inline NUMA event counter updates

On 4/14/21 3:39 PM, Mel Gorman wrote:
> __count_numa_event is small enough to be treated similarly to
> __count_vm_event so inline it.
> 
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>

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

> ---
>  include/linux/vmstat.h | 9 +++++++++
>  mm/vmstat.c            | 9 ---------
>  2 files changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
> index fc14415223c5..dde4dec4e7dd 100644
> --- a/include/linux/vmstat.h
> +++ b/include/linux/vmstat.h
> @@ -237,6 +237,15 @@ static inline unsigned long zone_page_state_snapshot(struct zone *zone,
>  }
>  
>  #ifdef CONFIG_NUMA
> +/* See __count_vm_event comment on why raw_cpu_inc is used. */
> +static inline void
> +__count_numa_event(struct zone *zone, enum numa_stat_item item)
> +{
> +	struct per_cpu_zonestat __percpu *pzstats = zone->per_cpu_zonestats;
> +
> +	raw_cpu_inc(pzstats->vm_numa_event[item]);
> +}
> +
>  extern void __count_numa_event(struct zone *zone, enum numa_stat_item item);
>  extern unsigned long sum_zone_node_page_state(int node,
>  					      enum zone_stat_item item);
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 63bd84d122c0..b853df95ed0c 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -902,15 +902,6 @@ void drain_zonestat(struct zone *zone, struct per_cpu_zonestat *pzstats)
>  #endif
>  
>  #ifdef CONFIG_NUMA
> -/* See __count_vm_event comment on why raw_cpu_inc is used. */
> -void __count_numa_event(struct zone *zone,
> -				 enum numa_stat_item item)
> -{
> -	struct per_cpu_zonestat __percpu *pzstats = zone->per_cpu_zonestats;
> -
> -	raw_cpu_inc(pzstats->vm_numa_event[item]);
> -}
> -
>  /*
>   * Determine the per node value of a stat item. This function
>   * is called frequently in a NUMA machine, so try to be as
>