Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030456AbXAaUlz (ORCPT ); Wed, 31 Jan 2007 15:41:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030484AbXAaUlz (ORCPT ); Wed, 31 Jan 2007 15:41:55 -0500 Received: from agminet01.oracle.com ([141.146.126.228]:31807 "EHLO agminet01.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030456AbXAaUly (ORCPT ); Wed, 31 Jan 2007 15:41:54 -0500 In-Reply-To: <20070131200502.GO1344@kvack.org> References: <1170209044.26655.364.camel@localhost.localdomain> <6CDD5D9D-E031-499D-9A8A-5A8522C66D37@oracle.com> <20070131175118.GN1344@kvack.org> <20070131200502.GO1344@kvack.org> Mime-Version: 1.0 (Apple Message framework v752.3) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: Cc: Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, linux-aio@kvack.org, Suparna Bhattacharya , Linus Torvalds Content-Transfer-Encoding: 7bit From: Zach Brown Subject: Re: [PATCH 0 of 4] Generic AIO by scheduling stacks Date: Wed, 31 Jan 2007 12:41:11 -0800 To: Benjamin LaHaise 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: 1110 Lines: 25 > Take FPU state: memory copies and RAID xor functions use MMX/SSE and > require that the full task state be saved and restored. Sure, that much is obvious. I was hoping to see what FPU state juggling actually requires. I'm operating under the assumption that it won't be *terrible*. > Task priority is another. POSIX AIO lets you specify request > priority, and > it really is needed for realtime workloads where things like keepalive > must be processed at a higher priority. Yeah. A first-pass approximation might be to have threads with asys system calls grouped by priority. Leaving all that priority handling to the *task* scheduler, instead of the dirt-stupid fibril "scheduler", would be great. If we can get away with it. I don't have a good feeling for what portion of the world actually cares about this, or to what degree. - 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/