linux-kernel - Re: [PATCH 1/2] vmscan: shrink_all_slab() use reclaim_state instead the return value of shrink

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Date:	Sat, 24 Jul 2010 21:05:05 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Nick Piggin <npiggin@...nel.dk>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Frank Mayhar <fmayhar@...gle.com>,
	John Stultz <johnstul@...ibm.com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: Re: [PATCH 1/2] vmscan: shrink_all_slab() use reclaim_state instead 
	the return value of shrink_slab()

2010/7/24 KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>:
> Now, shrink_slab() doesn't return number of reclaimed objects. IOW,
> current shrink_all_slab() is broken. Thus instead we use reclaim_state
> to detect no reclaimable slab objects.
>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> ---
>  mm/vmscan.c |   20 +++++++++-----------
>  1 files changed, 9 insertions(+), 11 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index d7256e0..bfa1975 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -300,18 +300,16 @@ static unsigned long shrink_slab(struct zone *zone, unsigned long scanned, unsig
>  void shrink_all_slab(void)
>  {
>        struct zone *zone;
> -       unsigned long nr;
> +       struct reclaim_state reclaim_state;
>
> -again:
> -       nr = 0;
> -       for_each_zone(zone)
> -               nr += shrink_slab(zone, 1, 1, 1, GFP_KERNEL);
> -       /*
> -        * If we reclaimed less than 10 objects, might as well call
> -        * it a day. Nothing special about the number 10.
> -        */
> -       if (nr >= 10)
> -               goto again;
> +       current->reclaim_state = &reclaim_state;
> +       do {
> +               reclaim_state.reclaimed_slab = 0;
> +               for_each_zone(zone)

Oops, this should be for_each_populated_zone().


> +                       shrink_slab(zone, 1, 1, 1, GFP_KERNEL);
> +       } while (reclaim_state.reclaimed_slab);
> +
> +       current->reclaim_state = NULL;
>  }
>
>  static inline int is_page_cache_freeable(struct page *page)
> --
> 1.6.5.2
>
>
>
> --
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