From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [ofa-general] Re: [GIT PULL] please pull ummunotify Date: Mon, 12 Oct 2009 22:05:15 -0600 Message-ID: <20091013040515.GI18578@obsidianresearch.com> References: <1253198976.14935.27.camel@laptop> <20090929171332.GD14405@elf.ucw.cz> <20090930094456.GD24621@elte.hu> <20090930160232.GZ22310@obsidianresearch.com> <20091012181944.GF17138@elte.hu> <20091012193048.GA20313@obsidianresearch.com> <20091012202046.GA7648@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20091012202046.GA7648-X9Un+BFzKDI@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Ingo Molnar Cc: Pavel Machek , Roland Dreier , Peter Zijlstra , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Paul Mackerras , Anton Blanchard , general-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, Jeff Squyres List-Id: linux-rdma@vger.kernel.org On Mon, Oct 12, 2009 at 10:20:46PM +0200, Ingo Molnar wrote: > It might be more acceptable because the flag-hint mechanism can at most > cause over-flushing - while with perf events we might miss to invalidate > a range altogether. Right. Overflushing is not important, but missing an event entirely is not recoverable (at least within the current kernel APIs). Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751172AbZJMEGF (ORCPT ); Tue, 13 Oct 2009 00:06:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750970AbZJMEGE (ORCPT ); Tue, 13 Oct 2009 00:06:04 -0400 Received: from 139-142-54-143.atc.vaillant.ca ([139.142.54.143]:53647 "EHLO quartz.edm.orcorp.ca" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1750907AbZJMEGE (ORCPT ); Tue, 13 Oct 2009 00:06:04 -0400 Date: Mon, 12 Oct 2009 22:05:15 -0600 From: Jason Gunthorpe To: Ingo Molnar Cc: Pavel Machek , Roland Dreier , Peter Zijlstra , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Paul Mackerras , Anton Blanchard , general@lists.openfabrics.org, akpm@linux-foundation.org, torvalds@linux-foundation.org, Jeff Squyres Subject: Re: [ofa-general] Re: [GIT PULL] please pull ummunotify Message-ID: <20091013040515.GI18578@obsidianresearch.com> References: <1253198976.14935.27.camel@laptop> <20090929171332.GD14405@elf.ucw.cz> <20090930094456.GD24621@elte.hu> <20090930160232.GZ22310@obsidianresearch.com> <20091012181944.GF17138@elte.hu> <20091012193048.GA20313@obsidianresearch.com> <20091012202046.GA7648@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091012202046.GA7648@elte.hu> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 12, 2009 at 10:20:46PM +0200, Ingo Molnar wrote: > It might be more acceptable because the flag-hint mechanism can at most > cause over-flushing - while with perf events we might miss to invalidate > a range altogether. Right. Overflushing is not important, but missing an event entirely is not recoverable (at least within the current kernel APIs). Jason