linux-kernel - Re: [PATCH 06/12] vmscan: simplify shrink_inactive

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Date:	Mon, 14 Jun 2010 14:06:13 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <npiggin@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 06/12] vmscan: simplify shrink_inactive_list()

On 06/14/2010 07:17 AM, Mel Gorman wrote:
> From: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
>
> Now, max_scan of shrink_inactive_list() is always passed less than
> SWAP_CLUSTER_MAX. then, we can remove scanning pages loop in it.
> This patch also help stack diet.
>
> detail
>   - remove "while (nr_scanned<  max_scan)" loop
>   - remove nr_freed (now, we use nr_reclaimed directly)
>   - remove nr_scan (now, we use nr_scanned directly)
>   - rename max_scan to nr_to_scan
>   - pass nr_to_scan into isolate_pages() directly instead
>     using SWAP_CLUSTER_MAX
>
> Signed-off-by: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> Reviewed-by: Johannes Weiner<hannes@...xchg.org>

Other than the weird whitespace below,

Reviewed-by: Rik van Riel <riel@...hat.com>

> +	/*
> +	 * If we are direct reclaiming for contiguous pages and we do
> +	 * not reclaim everything in the list, try again and wait
> +	 * for IO to complete. This will stall high-order allocations
> +	 * but that should be acceptable to the caller
> +	 */
> +	if (nr_reclaimed<  nr_taken&&  !current_is_kswapd()&&  sc->lumpy_reclaim_mode) {
> +		congestion_wait(BLK_RW_ASYNC, HZ/10);

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