Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932378AbXBETmK (ORCPT ); Mon, 5 Feb 2007 14:42:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933420AbXBETmK (ORCPT ); Mon, 5 Feb 2007 14:42:10 -0500 Received: from agminet01.oracle.com ([141.146.126.228]:22557 "EHLO agminet01.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932378AbXBETmI (ORCPT ); Mon, 5 Feb 2007 14:42:08 -0500 In-Reply-To: References: <20070201083611.GC18233@elte.hu> <20070202104900.GA13941@elte.hu> <20070202222110.GA1212@elte.hu> <20070202235531.GA18904@elte.hu> <20070203082308.GA6748@elte.hu> Mime-Version: 1.0 (Apple Message framework v752.3) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <8CF4BE18-8EEF-4ACA-A4B4-B627ED3B4831@oracle.com> Cc: Ingo Molnar , Linus Torvalds , Linux Kernel Mailing List , linux-aio@kvack.org, Suparna Bhattacharya , Benjamin LaHaise Content-Transfer-Encoding: 7bit From: Zach Brown Subject: Re: [PATCH 2 of 4] Introduce i386 fibril scheduling Date: Mon, 5 Feb 2007 14:41:31 -0500 To: Davide Libenzi X-Mailer: Apple Mail (2.752.3) X-Brightmail-Tracker: AAAAAQAAAAI= X-Whitelist: TRUE Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1049 Lines: 34 > The "result" of one async operation is basically a cookie and a result > code. Eight or sixteen bytes at most. s/basically/minimally/ Well, yeah. The patches I sent had: struct asys_completion { long return_code; unsigned long cookie; }; That's as stupid as it gets. > IMO, before going wacko designing > complex shared userspace-kernel result buffers, I think it'd be better > measuring the worth-value of the thing ;) Obviously, yes. The potential win is to be able to have one place to wait for collection from multiple sources. Some of them might want more data per event. They can always indirect out via a cookie pointer, sure, but at insanely high message rates (10gige small messages) one might not want that. See also: the kevent thread. - z - 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/