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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FA05251.5060105@redhat.com>
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.

-- 
All rights reversed
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/