From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 7 Nov 2007 13:17:36 -0500 From: Rik van Riel Subject: Re: [RFC PATCH 3/10] define page_file_cache Message-ID: <20071107131736.437a21e0@bree.surriel.com> In-Reply-To: References: <20071103184229.3f20e2f0@bree.surriel.com> <20071103185516.24832ab0@bree.surriel.com> <20071106215552.4ab7df81@bree.surriel.com> <20071106221710.3f9b8dd6@bree.surriel.com> <20071107093527.0d312903@bree.surriel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Wed, 7 Nov 2007 10:06:10 -0800 (PST) Christoph Lameter wrote: > On Wed, 7 Nov 2007, Rik van Riel wrote: > > > How exactly can an anonymous page ever become file backed? > > When they get assigned a swap entry. That does not change their status. They're still swap backed. > > > Do ramfs pages count as memory backed? > > > > Since ramfs pages cannot be evicted from memory at all, they > > should go into the "noreclaim" page set. > > Which LRU do they go on. With the patch set from last weekend, the file LRU. With the patch set later this week, they'll be in the "noreclaim" page set, which is never scanned by the VM. -- "Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." - Brian W. Kernighan -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org