Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030755AbXAZPot (ORCPT ); Fri, 26 Jan 2007 10:44:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030752AbXAZPot (ORCPT ); Fri, 26 Jan 2007 10:44:49 -0500 Received: from omx2-ext.sgi.com ([192.48.171.19]:35324 "EHLO omx2.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1030731AbXAZPos (ORCPT ); Fri, 26 Jan 2007 10:44:48 -0500 Date: Fri, 26 Jan 2007 07:44:42 -0800 (PST) From: Christoph Lameter To: Andrew Morton cc: Nick Piggin , linux-mm@kvack.org, linux-kernel@vger.kernel.org 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: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 793 Lines: 25 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/