From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 0F9A87D043 for ; Fri, 18 May 2018 12:48:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751815AbeERMrz (ORCPT ); Fri, 18 May 2018 08:47:55 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:57594 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751112AbeERMrz (ORCPT ); Fri, 18 May 2018 08:47:55 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7F11181FE15F; Fri, 18 May 2018 12:47:54 +0000 (UTC) Received: from redhat.com (ovpn-125-92.rdu2.redhat.com [10.10.125.92]) by smtp.corp.redhat.com (Postfix) with SMTP id C3EDA83B99; Fri, 18 May 2018 12:47:53 +0000 (UTC) Date: Fri, 18 May 2018 15:47:53 +0300 From: "Michael S. Tsirkin" To: Paolo Bonzini Cc: Eduardo Habkost , linux-kernel@vger.kernel.org, Radim =?utf-8?B?S3LEjW3DocWZ?= , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH] kvm: rename HINTS_DEDICATED to KVM_HINTS_REALTIME Message-ID: <20180518154721-mutt-send-email-mst@kernel.org> References: <1526568841-35372-1-git-send-email-mst@redhat.com> <20180517184658.GA1543@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Fri, 18 May 2018 12:47:54 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Fri, 18 May 2018 12:47:54 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'mst@redhat.com' RCPT:'' Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Fri, May 18, 2018 at 11:41:23AM +0200, Paolo Bonzini wrote: > On 17/05/2018 20:46, Eduardo Habkost wrote: > > My understanding of the original patch is that the intention is > > to tell the guest that it is very unlikely to be preempted, so it > > can choose a more appropriate spinlock implementation. This > > description implies that the guest will never be preempted, which > > is much stronger guarantee. > > > > Isn't this new description incompatible with existing usage of > > the hint, which might include people who just use vCPU pinning > > but no mlock? > > If you use hugetlbfs and vhost-user you don't really need mlock for the > QEMU process, do you? The QEMU process is not doing much in that case > and hugetlbfs gives you pinned memory automatically. > > Paolo Same with PCI device passthrough: VFIO pins all guest memory right now. -- MST -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html