linux-kernel - Re: [PATCH 2/3] Refactor zone

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Date:	Tue, 14 Dec 2010 19:01:26 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, akpm@...ux-foundation.org, npiggin@...nel.dk,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	kosaki.motohiro@...fujitsu.com, cl@...ux.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 2/3] Refactor zone_reclaim (v2)

Hi Balbir,

On Fri, Dec 10, 2010 at 11:31 PM, Balbir Singh
<balbir@...ux.vnet.ibm.com> wrote:
> Move reusable functionality outside of zone_reclaim.
> Make zone_reclaim_unmapped_pages modular
>
> Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
> ---
>  mm/vmscan.c |   35 +++++++++++++++++++++++------------
>  1 files changed, 23 insertions(+), 12 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index e841cae..4e2ad05 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2815,6 +2815,27 @@ static long zone_pagecache_reclaimable(struct zone *zone)
>  }
>
>  /*
> + * Helper function to reclaim unmapped pages, we might add something
> + * similar to this for slab cache as well. Currently this function
> + * is shared with __zone_reclaim()
> + */
> +static inline void
> +zone_reclaim_unmapped_pages(struct zone *zone, struct scan_control *sc,
> +                               unsigned long nr_pages)
> +{
> +       int priority;
> +       /*
> +        * Free memory by calling shrink zone with increasing
> +        * priorities until we have enough memory freed.
> +        */
> +       priority = ZONE_RECLAIM_PRIORITY;
> +       do {
> +               shrink_zone(priority, zone, sc);
> +               priority--;
> +       } while (priority >= 0 && sc->nr_reclaimed < nr_pages);
> +}

As I said previous version, zone_reclaim_unmapped_pages doesn't have
any functions related to reclaim unmapped pages.
The function name is rather strange.
It would be better to add scan_control setup in function inner to
reclaim only unmapped pages.

-- 
Kind regards,
Minchan Kim
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