linux-kernel - Re: [PATCH 1/3] mm, vmscan: cleanup lru size claculations

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Date:   Tue, 17 Jan 2017 15:58:19 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Michal Hocko <mhocko@...nel.org>
CC:     Johannes Weiner <hannes@...xchg.org>, Mel Gorman <mgorman@...e.de>,
        Hillf Danton <hillf.zj@...baba-inc.com>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 1/3] mm, vmscan: cleanup lru size claculations

On Mon, Jan 16, 2017 at 08:33:15PM +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
> 
> lruvec_lru_size returns the full size of the LRU list while we sometimes
> need a value reduced only to eligible zones (e.g. for lowmem requests).
> inactive_list_is_low is one such user. Later patches will add more of
> them. Add a new parameter to lruvec_lru_size and allow it filter out
> zones which are not eligible for the given context.
> 
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Michal Hocko <mhocko@...e.com>
> ---
>  include/linux/mmzone.h |  2 +-
>  mm/vmscan.c            | 88 ++++++++++++++++++++++++--------------------------
>  mm/workingset.c        |  2 +-
>  3 files changed, 45 insertions(+), 47 deletions(-)
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index d1d440cff60e..91f69aa0d581 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -780,7 +780,7 @@ static inline struct pglist_data *lruvec_pgdat(struct lruvec *lruvec)
>  #endif
>  }
>  
> -extern unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru);
> +extern unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone_idx);
>  
>  #ifdef CONFIG_HAVE_MEMORY_PRESENT
>  void memory_present(int nid, unsigned long start, unsigned long end);
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index cf940af609fd..1cb0ebdef305 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -234,22 +234,38 @@ bool pgdat_reclaimable(struct pglist_data *pgdat)
>  		pgdat_reclaimable_pages(pgdat) * 6;
>  }
>  
> -unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru)
> +/** lruvec_lru_size -  Returns the number of pages on the given LRU list.

minor:

/*
 * lruvec_lru_size

I don't have any preferance but just found.

Otherwise,
Acked-by: Minchan Kim <minchan@...nel.org>