linux-kernel - Re: [patch 2/5] mm + fs: prepare for non-page entries in page cache

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Date:	Tue, 01 May 2012 17:14:57 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/5] mm + fs: prepare for non-page entries in page cache

On 05/01/2012 04:24 PM, Andrew Morton wrote:

> That's a pretty significant alteration in the meaning of ->nrpages.
> Did this not have any other effects?

 From what I see (though it's been a long day), ->nrpages
stays the same it is now.

The non-page entries are simply not counted in ->nrpages.

> What does truncate do?  I assume it invalidates shadow page entries in
> the radix tree?  And frees the radix-tree nodes?

Indeed, truncate will get rid of the non-page entries
in the radix tree.  That is why it needs to be called
even if ->nrpages==0.

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