Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261869AbVDKS2E (ORCPT ); Mon, 11 Apr 2005 14:28:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261875AbVDKS2E (ORCPT ); Mon, 11 Apr 2005 14:28:04 -0400 Received: from webmail.topspin.com ([12.162.17.3]:1779 "EHLO exch-1.topspincom.com") by vger.kernel.org with ESMTP id S261869AbVDKS2B (ORCPT ); Mon, 11 Apr 2005 14:28:01 -0400 To: Troy Benjegerdes Cc: linux-kernel@vger.kernel.org, openib-general@openib.org Subject: Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation X-Message-Flag: Warning: May contain useful information References: <200544159.Ahk9l0puXy39U6u6@topspin.com> <20050411142213.GC26127@kalmia.hozed.org> <52mzs51g5g.fsf@topspin.com> <20050411163342.GE26127@kalmia.hozed.org> <5264yt1cbu.fsf@topspin.com> <20050411180107.GF26127@kalmia.hozed.org> From: Roland Dreier Date: Mon, 11 Apr 2005 11:03:08 -0700 In-Reply-To: <20050411180107.GF26127@kalmia.hozed.org> (Troy Benjegerdes's message of "Mon, 11 Apr 2005 13:01:08 -0500") Message-ID: <52oeclyyw3.fsf@topspin.com> User-Agent: Gnus/5.1006 (Gnus v5.10.6) XEmacs/21.4 (Jumbo Shrimp, linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 11 Apr 2005 18:03:08.0541 (UTC) FILETIME=[B7A1E2D0:01C53EC0] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 567 Lines: 13 Troy> Do we even need the mlock in userspace then? Yes, because the kernel may go through and unmap pages from userspace while trying to swap. Since we have the page locked in the kernel, the physical page won't go anywhere, but userspace might end up with a different page mapped at the same virtual address. - R. - 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/