Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964794AbXBNWE5 (ORCPT ); Wed, 14 Feb 2007 17:04:57 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964796AbXBNWE5 (ORCPT ); Wed, 14 Feb 2007 17:04:57 -0500 Received: from kanga.kvack.org ([66.96.29.28]:52168 "EHLO kanga.kvack.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964794AbXBNWE4 (ORCPT ); Wed, 14 Feb 2007 17:04:56 -0500 Date: Wed, 14 Feb 2007 17:04:44 -0500 From: Benjamin LaHaise To: Ingo Molnar Cc: Davide Libenzi , Russell King , Linux Kernel Mailing List , Linus Torvalds , Arjan van de Ven , Christoph Hellwig , Andrew Morton , Alan Cox , Ulrich Drepper , Zach Brown , Evgeniy Polyakov , "David S. Miller" , Suparna Bhattacharya , Thomas Gleixner Subject: Re: [patch] x86: split FPU state from task state Message-ID: <20070214220443.GN32271@kvack.org> References: <20070214103655.GB4241@flint.arm.linux.org.uk> <20070214105039.GC6801@elte.hu> <20070214110419.GC4241@flint.arm.linux.org.uk> <20070214180344.GI32271@kvack.org> <20070214200347.GK32271@kvack.org> <20070214203438.GL32271@kvack.org> <20070214214944.GA1082@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070214214944.GA1082@elte.hu> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 963 Lines: 20 On Wed, Feb 14, 2007 at 10:49:44PM +0100, Ingo Molnar wrote: > this can very much be done, with a straightforward extension of how we > handle FPU state. That makes sense independently of syslets/async as > well, so find below the standalone patch from Arjan. It's in my current > syslet queue and works great. That patch adds a bunch of memory dereferences and another allocation to the thread creation code path -- a tax that all users must pay. Granted, it's small, but at the very least should be configurable out for the 99.9% of users that will never use this functionality. I'm willing to be convinced, it's just that I would like to see some numbers that scream out that this is a good thing. -ben - 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/