From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 26 Jan 2007 07:44:42 -0800 (PST) From: Christoph Lameter Subject: Re: [RFC] Track mlock()ed pages In-Reply-To: <20070126031300.59f75b06.akpm@osdl.org> Message-ID: References: <45B9A00C.4040701@yahoo.com.au> <20070126031300.59f75b06.akpm@osdl.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Nick Piggin , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Fri, 26 Jan 2007, Andrew Morton wrote: > > > > Track mlocked pages via a ZVC > > Why? Large amounts of mlocked pages may be a problem for 1. Reclaim behavior. 2. Defragmentation > You could perhaps go for a walk across all the other vmas which presently > map this page. If any of them have VM_LOCKED, don't increment the counter. > Similar on removal: only decrement the counter when the final mlocked VMA > is dropping the pte. For that we would need an additional refcount for vmlocked maps in the page struct. Looks too expensive. -- 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