linux-kernel - Re: [PATCH 09/12] vmscan: Setup pagevec as late as possible in shrink_page

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Message-Id: <20100616164801.9d3c0d99.akpm@linux-foundation.org>
Date:	Wed, 16 Jun 2010 16:48:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
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>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 09/12] vmscan: Setup pagevec as late as possible in
 shrink_page_list()

On Mon, 14 Jun 2010 12:17:50 +0100
Mel Gorman <mel@....ul.ie> wrote:

> shrink_page_list() sets up a pagevec to release pages as according as they
> are free. It uses significant amounts of stack on the pagevec. This
> patch adds pages to be freed via pagevec to a linked list which is then
> freed en-masse at the end. This avoids using stack in the main path that
> potentially calls writepage().
> 

hm, spose so.  I cen't see any trivial way to eliminate the local
pagevec there.

> +	if (pagevec_count(&freed_pvec))
> +		__pagevec_free(&freed_pvec);
> ...
> -	if (pagevec_count(&freed_pvec))
> -		__pagevec_free(&freed_pvec);

That's an open-coded pagevec_free().
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