linux-kernel - Re: [PATCH 3/3] add isolate pages vmstat

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Date:	Fri, 17 Jul 2009 16:00:11 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH 3/3] add isolate pages vmstat

> > @@ -740,6 +744,13 @@ int migrate_pages(struct list_head *from
> >  	struct page *page2;
> >  	int swapwrite = current->flags & PF_SWAPWRITE;
> >  	int rc;
> > +	int flags;
> > +
> > +	local_irq_save(flags);
> > +	list_for_each_entry(page, from, lru)
> > +		__inc_zone_page_state(page, NR_ISOLATED_ANON +
> > +				      !!page_is_file_cache(page));
> > +	local_irq_restore(flags);
> >
> 
> Why do a separate pass over all the migrates pages? Can you add the
> _inc_xx  somewhere after the page was isolated from the lru by calling
> try_to_unmap()?

calling try_to_unmap()? the pages are isolated before calling migrate_pages().
migrate_pages() have multiple caller. then I put this __inc_xx into top of
migrate_pages().



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