linux-kernel - Re: [PATCH 06/10] vmscan: Split shrink

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Message-ID: <20100416042308.GZ2493@dastard>
Date:	Fri, 16 Apr 2010 14:23:08 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Chris Mason <chris.mason@...cle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 06/10] vmscan: Split shrink_zone to reduce stack usage

On Thu, Apr 15, 2010 at 06:21:39PM +0100, Mel Gorman wrote:
> shrink_zone() calculculates how many pages it needs to shrink from each
> LRU list in a given pass. It uses a number of temporary variables to
> work this out that then remain on the stack. This patch splits the
> function so that some of the stack variables can be discarded.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>
> ---
>  mm/vmscan.c |   29 +++++++++++++++++++----------
>  1 files changed, 19 insertions(+), 10 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 1ace7c6..a374879 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1595,19 +1595,14 @@ static unsigned long nr_scan_try_batch(unsigned long nr_to_scan,
>  	return nr;
>  }
>  
> -/*
> - * This is a basic per-zone page freer.  Used by both kswapd and direct reclaim.
> - */
> -static void shrink_zone(struct zone *zone, struct scan_control *sc)
> +/* Calculate how many pages from each LRU list should be scanned */
> +static void calc_scan_trybatch(struct zone *zone,
> +				 struct scan_control *sc, unsigned long *nr)

Needs "noinline_for_stack" to stop the compiler re-inlining it.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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